Telescopic hose and processing technology thereof

Abstract

The present invention discloses a telescopic hose and the process technology thereof. The telescopic hose comprises an elastic support member that can be configured to conduct strong electricity; the support member comprises a first wire and a second wire, and the first wire and the second wire are arranged in a double helix structure in cooperation with each other; a hose wall that is wrapped around the outer side of the support member, and at least part of the hose wall between the first wire and the second wire forms a corrugated portion. Through the setting of the above structures, the hose can not only conduct strong electricity, but also stretch back and forth and turn at any angle. In addition, the hose structure is relatively simple, the amount of gas and liquid passing per unit time is larger.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of Chinese Patent Application No. 202110373379.0 filed on Apr. 7, 2021, the contents of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to the technical field of hose industry, and more particularly to a telescopic hose and a process technology thereof.

BACKGROUND

In the prior art, telescopic hoses that can be energized are generally intertwined with ordinary steel wires or copper-plated steel wires to achieve the electric conduction of telescopic hoses. Although this technical solution can realize the conduction of strong electricity of the telescopic hose, the hose has both wires and support members, and the hose body is coated with multiple wires. Since the part that is coated with wires cannot be stretched, a longer inner spiral folded layer is required to achieve a certain stretch ratio, making the hose wall thicker; when the outer diameter is same, the inner hole of the hose is relatively small, which affects the gas-liquid flow rate and reduces the utilization efficacy of the hose to a certain extent; furthermore, due to a heavier hose body, it not only increases the production cost, but also affects the user experiences.

SUMMARY

In order to overcome the shortcomings of the prior art, the present invention provides a telescopic hose with a simple structure and a large gas-liquid flow.

To achieve the above object, the present invention adopts the following technical solutions:

A telescopic hose, including:

• • an elastic support member that is configured to conduct strong electricity; the support member comprises a first wire and a second wire, and the first wire and the second wire are arranged in a double helix structure in cooperation with each other;
  • a hose wall that is wrapped around the outer side of the support member, and at least part of the hose wall between the first wire and the second wire forms a corrugated portion;

The cooperation of the first wire and the second wire and the setting of a double helix structure can be used to provide power supply and support the hose wall, to make the hose wall, the first wire and the second wire to cooperate with each other to form a hose that can be stretched back and forth and bent, and make it possible to use a flexible wire directly to support the hose wall, so that the prepared hose can not only conduct strong electricity to realize the supply of power, but also make the hose to stretch back and forth and turn at any angle. In addition, the hose structure is relatively simple, which can ensure a relatively large inner diameter of the hose with the same outer diameter, so that the amount of gas and liquid passing per unit time is larger, moreover, the hose occupies a small space, so it is more convenient to use; and with a lower cost, it is conducive to production, processing and promotion.

Further, when the hose is in a contraction state, a corrugated portion is formed on the inner side of the hose wall, and two corrugated portions located on both sides of the second wire abut against each other, while a gap is reserved between two corrugated portions located on both sides of the first wire.

Further, the first wire comprises an inner core, a conductive layer arranged on the inner core, and an insulating layer that is wrapped outside the conductive layer; Through the setting of the above structures, the wires have the conductive ability, and no electric leakage will occur.

Further, the inner core comprises at least the following components: carbon, manganese, sulfur, phosphorus and silicon; the mass percents of components in the inner core are:

• • carbon 0.42-0.5%;
  • manganese 0.5-0.8%;
  • sulfur ≤≥0.035%;
  • phosphorus ≤≥0.035%;
  • silicon 0.17-0.37%.

Through the setting of the above structure, the wire can support the radial direction in which the telescopic hose is supported, and has sufficient elasticity and toughness; and the structure is simple, so that the telescopic hose can be bent at any angle without mounting other support member or elastic member, making the bending more convenient and labor-saving, and more cost-saving, and the hose is thinner and lighter.

Further, the diameter of the inner core is in the range of 0.935 mm to 0.965 mm; through the setting of the above structure, it ensures that the inner core has a sufficient strength and a sufficient elasticity. The elasticity is moderate, and the bending is more labor-saving.

Further, the thickness of the conductive layer is in the range of 0.035 mm to 0.065 mm; through the setting of the above structure, it ensures that the conductive layer has a good electrical conductivity and will not affect the elasticity of the inner core; and ensures that the inner core can stretch back and forth without damaging the conductive layer.

Further, the copper content in the conductive layer is ≥99.5%; through the setting of the above structure, the wire has a sufficient conductivity and can better conduct strong electricity, which is not easy to lose during transmission.

Further, the conductive layer is made of a copper metal material and is formed on the inner core through one or more of the processes of electroplating, coating, hot casting, hot dipping or electroforming; making the processing more conveniently and efficiently.

Further, the insulating layer is made of a rubber material.

The present invention further provides a process technology of a telescopic hose, comprising:

• • S1, making a first wire and a second wire, arranged in a double helix structure to form a support member;
  • S2, stretching and unfolding the support member, and wrapping an rubber strip around the outer side of the first wire and the second wire to form a hose wall;
  • S3, releasing the support member so that the support member shrinks under the action of own elastic force and a corrugated portion is formed on the inner side of the hose wall.

In summary, in the present invention, through the setting of the above structures, the hose can not only conduct strong electricity, but also stretch back and forth and turn at any angle. In addition, the hose structure is relatively simple, the amount of gas and liquid passing per unit time is larger; furthermore, the hose has a low mass and is more convenient to use; and with a lower cost, it is conducive to production, processing and promotion.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial three-dimensional schematic view of a telescopic hose in a stretching state in the present invention;

FIG. 2 is a partial three-dimensional sectional view of a telescopic hose in a stretching state in the present invention;

FIG. 3 is an enlarged view of A in FIG. 2;

FIG. 4 is a partial cross-sectional view of a telescopic hose in a contraction state in the present invention.

DETAILED DESCRIPTION

As shown in FIGS. 1 to 4, a telescopic hose comprises a hose wall 3, a first wire 1 and a second wire 2. Both the first wire 1 and the second wire 2 are provided in a spiral structure, which are flexible and mounted in the hose wall in a double helix structure in cooperation with each other, to form a double helix skeleton (i.e., a support member); the hose wall 3 is formed by an encapsulation process. Specifically, the PVC material is made into rubber strips, then the rubber strips are spirally wound and wrapped around the first wire and second wire mounted in a double helix structure along the spiral pattern and direction of the double helix skeleton, and the adjacent rubber strips are at least partially overlapped each other to form a hose wall 3; before the encapsulation process, the first wire 1 and second wire 2 that are mounted in a double helix structure need to be stretched and unfolded, and then the rubber strips are wrapped around the outer side of the first wire and the second wire. When a hose wall is formed, the first wire and second wire will be bonded with the rubber strips forming the hose wall, so that the hose wall and the first wire and second wire are connected and fixed together; and when the first wire and second wire are not subjected to an external force any longer, the first wire and second wire will shrink under the action of their own elastic force, and the hose wall located between the first wire and the second wire will be folded to form a corrugated portion 31; and the first wire 1, the second wire 2 and the hose wall 3 will combine to become a telescopic hose.

That is, the process technology of a telescopic hose, at least comprising:

• • S1, making a first wire and a second wire, arranged in a double helix structure to form a support member;
  • S2, stretching and unfolding the support member, and wrapping an rubber strip around the outer side of the first wire and the second wire to form a hose wall;
  • S3, releasing the support member so that the support member shrinks under the action of own elastic force and a corrugated portion is formed on the inner side of the hose wall.

Further, when the hose in this application is in a contraction state, a corrugated portion 31 is formed on the inner side of the hose wall 3, and two corrugated portions 31 located on the left and right sides of the second wire 2 abut against each other, while a gap 32 is reserved between two corrugated portions located on the left and right sides of the first wire 1.

Specifically, the first wire 1 includes an insulating layer 11, a conductive layer 12 and an inner core 13. The inner core 13 is a special steel wire with sufficient rigidity, so that the telescopic hose made has sufficient radial strength, and is not easy to be flattened; in addition, it has sufficient elasticity and toughness, so that the telescopic hose can be stretched back and forth and bent arbitrarily, and is not easy to be damaged. Furthermore, the wires can not only realize the electric conduction functions, but also support the telescopic hose to prevent from deformation; and the hose can be bent arbitrarily, and has excellent elasticity, etc. It does not need to mount additional springs or support members for support, so it is cost-saving; moreover, the telescopic hose occupies a small space and is lighter, which avoids the problem of mutual crowding and interference caused by the installation of springs or support members and wires together, making the bending of the flexible hose more easily and labor-saving. The diameter of the inner core is 0.935-0.965 mm, preferably 0.957 mm; the conductive layer 12 is provided outside the inner core 13, and the conductive layer is made of copper. The conductive layer can be attached to the inner core by electroplating, cladding, hot casting/dipping and electroforming, etc., so that the copper content of the conductive layer is greater than or equal to 99.5%. The thickness of the conductive layer is between 0.035 mm and 0.065 mm, preferably 0.043 mm, so that the wire has excellent conductivity and the conducive layer will not affect the stretching and bending of the inner core; the insulating layer 11 is wrapped on the outer side of the conductive layer 12 and is made of a rubber material, playing a role of insulation; moreover, the wires are easier to bond with the hose wall 3, making the more secure fixation and higher structural strength. The structure and material of the second wire 2 are the same as those of the first wire 1.

Further, in the steel wire used to make inner core 13, in addition to iron element, other components and the mass percentages of each component are shown in the table below.

Carbon (C)     0.42-0.5%
Manganese (Mn) 0.5-0.8%
Sulfur (S)     ≤0.035%
Phosphorus (P) ≤0.035%
Silicon (Si)   0.17-0.37%

The conductive layer 12 is cladded on the inner core 13 to form a whole (i.e., copper-clad steel), which has the following characteristics:

	Item	Unit	Standard
	Wire diameter	mm	1.00 + 0.02/−0.02
	Tensile strength	Mpa	1200-1300
	Resistance	Ω/m	≤0.10

In the application, for the inner core 13, by adjusting the mass percentage of carbon, manganese, sulfur, phosphorus, and silicon in the steel wire, and wrapping the conductive layer 12 and insulating layer 11 outside of the inner core, to make the first wire 1 and the second wire 2, so that the first wire and the second wire can not only realize the electric conduction functions, but also support the telescopic hose to prevent from deformation; and the hose can be bent arbitrarily, and has excellent elasticity, etc. It does not need to mount additional springs or support members for support, so it is cost-saving; moreover, the telescopic hose made has a lower mass and is lighter, which avoids the problem of mutual crowding and interference caused by the installation of springs or support members and wires together, making the bending of the flexible hose more easily and labor-saving.

The applicant also conducts tests as shown in the following tables 1, 2 and 3, to test that various parameters of the product in this application meet the technical standards (in the experiments, the product refers to a telescopic hose in this application; the comparison sample is an existing similar product).

	TABLE 1
	Test environment
	Indoor
	temperature (° C.)
	23-27
	Indoor relative
Experiment		humidity (%)
Purpose	Type test	Test Result/	63
Test Item	Test Method	Standard	Sample No.	Phenomenon	Judgment
Tensile	Take a steel	Product 1#	1250	Mpa	Pass
strength	wire with a	Product 2#	1260	Mpa	Pass
	length of 100-200	Comparator 1#	1195	Mpa	Fail
	mm, fasten both	1200-1300	Mpa	Comparator 2#	1205	Mpa	Pass
	ends of the steel
	wire on the two
	fixtures of a
	testing machine,
	run the machine
	to measure the
	strength of the
	steel wire.
Resistance	Take 1 meter of	≤0.1	Ω/m	Product 1#	92.36	mΩ	Pass
test	rib strip to		Product 2#	91.21	mΩ	Pass
	measure the		Comparator 1#	103.56	mΩ	Fail
	resistance at both		Comparator 2#	101.71	mΩ	Fail
	ends.
Size 1	Measure the outer	1.0 ± 0.02	Product 1#	1.01	Pass
	diameter of a		Product 2#	0.98	Pass
	copper-clad		Comparator 1#	0.96	Fail
	steel using a		Comparator 2#	0.97	Fail
	Vernier caliper

	TABLE 2
	Test environment
	Indoor
	temperature (° C.)
	23-27
	Indoor relative
	humidity (%)
	63
	Test Result
Experiment	Type test	Scrap facing
Purpose			Sample No.-	the direction		Hole/
Test Item	Test Method	Standard	Stake No.	of rotation	Degumming	fracture	Downtime	Judgment
External	Place an entire hose or a part	350	Product 1-1#	↑	/	/	400	Pass
wear	with a suitable		Product 1-2#	↓	/	/	400	Pass
	length in an ambient temperature		Comparator 1-1#	↑	/	/	345	Fail
	of 20-27° C.		Comparator 1-2#	↓	/	/	325	Fail
	for more than 1 hour. Fix one end
	of the hose on the pulling
	end of the testing machine, and
	bear a weight of 1.13 Kg through a
	pulley on the other end. Allow
	the hose to pass through a
	pulley with 120-mesh (3M-U261)
	sandpaper at a rate of 20 rpm.
Horizontal	The test sample is an entire hose	20000	Product 1-8#	↑	/	/	26000	Pass
bending	or a part with a suitable length.		Product 1-9#	↓	/	/	26000	Pass
	Place the sample in an ambient		Comparator 1-8#	↑	/	/	21000	Pass
	temperature of 20-27° C. for more		Comparator 1-9#	↓	/	/	19987	Fail
	than 1 hour. Fix one end of the
	hose on a clamping position of a
	horizontal bending tester, and
	bear a weight of 4.536 Kg on the
	other end; let the hose lift up
	and down evenly at a speed of
	36 ± 1 rpm. The weight should
	be in a free hanging state
	throughout the cycle.
Vertical	Fix one end of a sample plate on	10000	Product 1-1#	↑	/	/	12000	Pass
lifting	a pivot arm of a testing machine.		Product 1-2#	↓	/	/	12000	Pass
	The distance between the pivot		Comparator 1-1#	↑	/	/	10500	Pass
	arm shaft and the hose extending		Comparator 1-2#	↓	/	/	9996	Fail
	into the rigid part is 300 ±
	5 mm, and the pivot arm can be
	raised from the horizontal
	position by 40° ± 1°.
	Hang a 5 kg weight on the other
	end of the hose, so that the pivot
	arm is in a horizontal position,
	and the weight is supported to
	not stretch the hose. Allow the
	weight to slide down the slope
	at a maximum deflection angle of
	3°, and raise and lower the
	pivot arm at a speed of 10 ± 1
	r/min. After testing for 2,500
	cycles, rotate the fixed end of
	the hose by 90°, then continue
	a test for 2,500 cycles. Repeat
	each test at other two positions of
	90°.
Cold and	Take a sample plate with a length	10	Product 1#	/	/	No	10	Pass
hot aging	of 0.61 m and place it at an		Product 2#	/	/	No	10	Pass
	ambient temperature of 20-27° C.		Comparator 1#	/	/	Yes	8	Fail
	for more than 1 hour. Bend the		Comparator 2#	/	Yes	Yes	9	Fail
	hose into a “U” shape, and
	tie the two ends of the hose
	together at 25 mm. Place the
	cooled hose in a test chamber of
	65° C. for drying for 3 hours,
	then place the hose at −20° C. and
	freeze for 3 hours, and then take
	it out and quickly repeat a 360°
	bending test for 3 times, each
	bending test lasts 1 second.
	Check whether the hose is
	damaged. It is regarded as a
	cycle, and a total of 10 cycles
	will be performed.
Puncture	Take a sample plate with a length		Product 1#	No holes or	Pass
test	of 0.61 m and bend it up, place			breaks of hose
	it in a 1% sodium chloride	No holes	Comparator 1#	Holes or breaks	Fail
	solution, apply 1 KV voltage to	or breaks		of hose
	the wires and medium for 1 min.
	check whether the hose is broken;
High	Take three complete hoses and	No holes	Product 1#/	No holes, breaks	Pass
temperature	place them in an oven at 70° C.	or breaks	2#/3#	or aging of hose
test	for 7 hours, and check if the		Comparator 1#/	Holes, breaks	Fail
	hoses are broken.		2#/3#	or aging of hose
Temperature	Take an entire hose, connect two	Temperature	Product 1#	28°	C.	Pass
rise test	wires and connect them to a	rise ≤35° C.	Product 2#	30°	C.	Pass
	sliding rheostat, adjust the		Comparator 1#	36°	C.	Fail
	voltage to 120 V, 60 Hz, 1 A, and		Comparator 1#	37°	C.	Fail
	gradually record the temperatures
	of each point of the hose from the
	original temperature to a stable
	temperature without
	increase, ≤35° C.
Leakage	Take a sample plate with a length	Leakage	Product 1#	0.1	mA	Pass
current test	of 0.61 m and bend it up, place it	current ≤	Product 2#	0.2	mA	Pass
	in a 1% sodium chloride solution,	0.5 mA	Comparator 1#	0.4	mA	Pass
	apply 1 KV voltage to the wires		Comparator 1#
	and medium for 1 min. Measure			0.6	mA	Fail
	the leakage current from the
	liquid.

	TABLE 3
	Test environment
	Indoor
	temperature (° C.)
	23-27
	Indoor relative
Experiment		humidity (%)
Purpose	Type test	Test Result/	63
Test Item	Test Method	Standard	Sample No.	Phenomenon	Judgment
Stretch	Take a hose with a length	1:3.2 ≤ x ≤ 1:4	Product 1#	1:3.72	Pass
ratio	of 500 mm, hang it with a		Product 2#	1:3.66	Pass
	4.5N tension, and measure		Product 3#	1:3.76	Pass
	the length of the hose to		Comparator 1#	1:3.18	Fail
	calculate the stretch ratio.		Comparator 2#	1:3.39	Pass
			Comparator 3#	1:4.01	Fail
Static	Take the hose with a length	≤10%	Product 1#	2.29%	Pass
load	of more than 200 mm and		Product 2#	1.85%	Pass
	place it at 20-27° C. for		Product 3#	1.01%	Pass
	more than 1 hour. The size		Comparator 1#	7.8%	Pass
	of the pressing block is:		Comparator 2#	9.3%	Pass
	305 (arm)*63.5* 12.7 mm.		Comparator 3#	10.01%	Fail
	Press the hose in the middle
	of the hose at a speed of
	12.7 mm/min until the
	deformation rate of about
	25%, holding for 30 seconds,
	recover for 30 min after
	removing the load, then
	measure the deformation rate
	of the hose. The deformation
	rate is calculated as a
	percentage of reducing =
	(original diameter − diameter
	after deformation)/original
	diameter.
Natural	Take a hose with a length of	≤600	mm	Product 1#	505	mm	Pass
hanging	500 mm, let go for 5 seconds		Product 2#	512	mm	Pass
	after stretching, and measure		Product 3#	510	mm	Pass
	the hanging value.		Comparator 1#	580	mm	Pass
			Comparator 2#	601	mm	Fail
			Comparator 3#	620	mm	Fail
Hanging	Hang a hose joint with	Hang with a weight of 20	Product 1#	No falling off of	Pass
test	a weight of 20 Kg for	Kg for 1 min. The joint		joint and no
	1 min. The joint does	does not fall off and the		cracking of the
	not fall off and the	hose body does not crack.		hose body
	hose body does not		Product 2#	No falling off of	Pass
	crack.			joint and no
				cracking of the
				hose body
			Product 3#	No falling off of	Pass
				joint and no
				cracking of the
				hose body
			Comparator 1#	Falling off of	Fail
				joint and cracking
				of the hose body
			Comparator 2#	No falling off of	Pass
				joint and no
				cracking of the
				hose body
			Comparator 3#	No falling off of	Pass
				joint and no
				cracking of the
				hose body
Temperature	Take an entire hose, connect	≤35°	C.	Product 1#	27°	C.	Pass
rise test	two wires and connect them to		Product 2#	26°	C.	Pass
	a sliding rheostat, adjust the		Product 3#	28°	C.	Pass
	voltage to 120 V, 50 Hz, 1.5		Comparator 1#	30°	C.	Pass
	A and record the temperature		Comparator 2#	35°	C.	Pass
	when the hose temperature is		Comparator 3#	37°	C.	Fail
	stable.

As shown from Table 3, the stretch ratio of the hose in the present application is set to 1:3.2≤x≤1:4, so that the hose in this application has a sufficient expansion and contraction performance; when it is hung naturally, the stretched length will not be too large, which makes it more convenient to hang and store when it is not in use, saving the space.

In addition, after testing, the copper content, conductivity and strength of the whole (i.e., copper-clad steel) formed after the conductive layer 12 is cladded on the inner core 13 in this application are as follows:

Copper content	Conductivity	Strength
(%)	(%)	(Mpa)
1.3	1	86.7
9.8	7.5	650
19.5	15	1300
23	17.7	1535

Apparently, embodiments described herein are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative work based on the embodiments herein shall fall within the scope of protection of the present invention.

Claims

1. A telescopic hose, comprising: an elastic support member that is configured to conduct electricity, wherein the support member comprises a first wire (1) and a second wire (2), and the first wire (1) and the second wire (2) are arranged in a double helix structure in cooperation with each other;a hose wall (3) that is wrapped around the outer side of the support member, wherein the first wire (1) and the second wire (2) are separated from each other by the hose wall (3) and at least part of the hose wall (3) between the first wire (1) and the second wire (2) forms a corrugated portion (31) on the inner side of the hose wall (3) when the hose is in a contraction state;wherein two corrugated portions (31) located on both sides of the second wire (2) abut against each other, while two corrugated portions (31) located on both sides of the first wire (1) do not abut against each other.

2. The telescopic hose according to claim 1, wherein first wire (1) comprises an inner core (13), a conductive layer (12) arranged on the inner core (13), and an insulating layer (11) that is wrapped outside the conductive layer (12).

3. The telescopic hose according to claim 2, wherein the inner core (13) comprises at least the following components: carbon, manganese, sulfur, phosphorus and silicon; the mass percents of components in the inner core (13) are: carbon 0.42-0.5%;manganese 0.5-0.8%;sulfur ≤0.035%;phosphorus ≤0.035%;silicon 0.17-0.37%.

4. The telescopic hose according to claim 2, wherein the diameter of the inner core (13) is in the range of 0.935 mm to 0.965 mm.

5. The telescopic hose according to claim 2, wherein the thickness of the conductive layer (12) is in the range of 0.035 mm to 0.065 mm.

6. The telescopic hose according to claim 2, wherein the insulating layer (11) is made of a rubber material.

7. The telescopic hose according to claim 2, wherein the conductive layer (12) is made of a copper metal material and is formed on the inner core (13) through one or more of the processes of electroplating, coating, hot casting, hot dipping or electroforming.

8. The telescopic hose according to claim 7, wherein a copper content in the conductive layer (12) is ≥99.5%.

9. A process technology of a telescopic hose, comprising: S1, making a first wire (1) and a second wire (2), arranged in a double helix structure to form a support member;S2, stretching and unfolding the support member, and wrapping a rubber strip around the outer side of the first wire (1) and the second wire (2) to form a hose wall (3);S3, releasing the support member so that the support member shrinks under the action of own elastic force and a corrugated portion (31) is formed on the inner side of the hose wall (3);wherein the first wire (1) and the second wire (2) are separated from each other by the hose wall (3); andtwo corrugated portions (31) located on both sides of the second wire (2) abut against each other, while two corrugated portions (31) located on both sides of the first wire (1) do not abut against each other.