Patent Application
20220282727
The present invention relates to a field of peristaltic pump mechanisms, and is particularly suitable for a toggle-type open-close clamping structural assembly and a pump head of a peristaltic pump.
A peristaltic pump is a special positive displacement pump, mainly used in the distribution or transportation of fluids, and widely used in pharmaceutical, food, chemical and other industries. When the pump head of the peristaltic pump is working, the rollers rotate, and a “pillow”-shaped fluid is formed in a section of pump tube between two rollers, and the fluid is pumped by alternately squeezing and releasing the elastic delivery hose of the pump. The hose is a consumable and needs to be replaced regularly.
In the design of the pump head of the existing peristaltic pump, the upper pipe clamp is generally fixed on the upper pressure block and moves up and down with the upper pressure block, and there is no relative displacement between the upper pipe clamp and the upper pressure block. The upper pressure block is driven move up and down by an eccentric shaft mechanism in the pump head of the peristaltic pump, and an eccentricity of an eccentric wheel in the eccentric shaft mechanism is an up and down movement displacement of the upper pressure block and the upper pipe clamp. When replacing the hose for the pump head of the peristaltic pump, since the upper pressure block and the upper pipe clamp are fixed as a whole, a relative displacement between the upper pipe clamp, the lower pipe clamp and a lower support is fixed (the relative displacement is equal to the eccentricity of the eccentric wheel). The eccentricity is twice the distance between a center of a connecting shaft installation hole of the eccentric wheel and a center of the eccentric wheel.
Due to the limitation of an overall size of the pump head of the peristaltic pump, the size of the eccentric wheel is also limited, so a lifting height of the upper pressure block is limited, resulting in a narrow space between the upper pipe clamp and the lower pipe clamp and the lower support. When replacing the hose, it is necessary to manually lift the upper pipe clamp or depress the lower pipe clamp after lifting the upper pressure block, which is very inconvenient to operate, especially for large-diameter hoses.
Purpose of the present invention, the present invention provides an eccentric liquid feeding mechanism aiming at the problems of uncontrollable hose damage and cumbersome and frequent hose replacement steps when the existing peristaltic pump feeding mechanism installs the hose.
The problem to be solved by the present invention is realized by the following technical scheme:
A toggle-type open-close clamping structural assembly, includes a lower pipe clamp and an upper pipe clamp that are oppositely arranged to form a hose clamp hoop, an upper pressure block used for lifting and lowering to open and close, and further includes: a driving lever used for enabling the upper pipe clamp to follow the upper pressure block to lift, slip and follow-up.
The driving lever is pivotally connected to the upper pressure block to connect, the upper pipe clamp and one end of the driving lever are overlappingly disposed in a clamping port reserved on the upper pressure block, and the other end of the driving lever is abutted against a fixing part serving as fixing reference, and in a lifting process of the upper pressure block, the upper pipe clamp is driven to lift and lower, and meanwhile, the driving lever follows up and rises and lifts up the upper pipe clamp, to cause the upper pipe clamp far away from the lower pipe clamp.
Further, the fixing part is disposed on a body, the body is glidingly matched with the upper pressure block, and a lower edge of the fixing part has a sliding surface for sliding of the driving lever, and in the lifting process of the upper pressure block, one end of the driving lever slides along the sliding surface, and meanwhile the other end of the driving lever lifts the upper pipe clamp.
Further, a groove is disposed on the upper pressure block for limiting the upper pipe clamp and the driving lever, and the upper pipe clamp is limited in the groove.
Further, the upper pipe clamp passes through the groove and is opposite to the lower pipe clamp, and the upper pipe clamp and the groove are in clearance fit to form a sliding setting.
Further, the driving lever is pivotally connected in the groove through a pivot, one end of the driving lever extends under a top platform of the upper pipe clamp, and the driving lever guides and limits a vertical direction of the upper pipe clamp.
Further, further a return spring is included, the return spring is connected between the upper pipe clamp and the top of the groove, and the return spring pushes back the upper pipe clamp in the vertical direction.
Further, the driving lever includes two driving lever arms, and the driving lever arms move synchronously around a central pivot.
A pump head of peristaltic pump, includes a pump head body, and the pump head body isolates a hose path used to clamp a hose, wherein: the upper pressure block is fitted to a reserved opening of the pump head body, and at least one fixed part and toggle-type open-close clamping structural assembly are arranged on either side of the pump head, and the fixed part is located on the body.
Further, the pump head body has an opening for the driving lever to pass out below the fixed part.
Compared with the prior art, the present invention has the following beneficial effects:
A toggle block is fixed on the upper pressure block through a pin shaft and can rotate around the pin shaft. One end of the toggle block is used to lift the upper pipe clamp, one end passes through the opening on the main body for the movement of the toggle block, and is pressed on an inclined plane of a top pressure toggle block of the body, and the inclined plane of the top pressure toggle block of the body is fixed. In the lifting process of the toggle block follows the upper pressure block, one end of the toggle block will rotate counterclockwise around the pin shaft under the action of the inclined plane, and the other end will toggle the upper pipe clamp to move upward relative to the upper pressure block, thus increasing a relative displacement between the upper pipe clamp, the lower pipe clamp and the lower support, that is, increasing the operation space for installing the hose.
The driving lever structure is exquisite and compact, which is conducive to integration in the pump head. In the process of use, it can automatically fold, lift pipe clamp with large displacement, and move coherently.
The mechanism is provided with at least two sets respectively arranged on both sides of the pump head, the mechanism is reasonably set up, and the force is relatively uniform.
The bottom surface of the fixed part is set as an inclined surface, and the inclined surface can match the sliding track in the sliding process of the driving lever to prevent the driving lever from wear and tear, and the mechanism is simple and exquisite, efficient and highly reliable.
Upper pipe clamp 1, Bending part 2, Groove 3, Driving lever 4, Fixing part 5, Return spring 6, Opening 7.
The present invention is further described below with reference to
As shown in
The driving lever is pivotally connected to the upper pressure block to connect, the upper pipe clamp and one end of the driving lever are overlappingly disposed in a clamping port reserved on the upper pressure block, and the other end of the driving lever is abutted against a fixing part serving as fixing reference, the fixing part 5 is a fixed and protruding part for acting on the driving lever.
The fixing part is glidingly matched with the upper pressure block, the upper pressure block slides vertically. A lower edge of the fixing part has a sliding surface for sliding of the driving lever, and in the lifting process of the upper pressure block, one end of the driving lever slides along the sliding surface, and meanwhile the other end lifts the upper pipe clamp. In a lifting process of the upper pressure block, the upper pipe clamp is driven to lift and lower, and meanwhile, the driving lever follows up and rises and lifts up the upper pipe clamp, to cause the upper pipe clamp far away from the lower pipe clamp.
As shown in
In order to ensure excellent resilience, a return spring is also provided. The return spring is connected between the upper pipe clamp and the top of the groove, and the return spring 6 pushes back the upper pipe clamp in the vertical direction. The bottom surface of the fixing part is a slope consistent with a gradient of an inclined plane formed by a path passed by the other end of the driving lever during the sliding process.
Embodiment 2, a pump head of peristaltic pump is provided, which includes the toggle-type open-close clamping structural assembly mentioned above, including a pump head body, and the pump head body isolates a hose path used to clamp a hose. The hose path is a placement path with openings on both sides and passing through a central rolling section. The upper pressure block is fitted to a reserved opening of the pump head body, and has at least one fixed part on the pump head body or a fixed part is set on both sides of the pump head body. Each fixed part corresponds to a set of the toggle-type open-close clamping structural assembly, and the toggle-type open-close clamping structural assembly corresponds to either side of the pump head. The fixed part is located on the body, the pump head body has an opening 7 for the driving lever to pass out below the fixed part, and an opening height is consistent with the displacement of a vertical height of the driving lever arm.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201910933057.X | Sep 2019 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2020/095115 | 6/9/2020 | WO |
