Single constant-speed cam double-plunger transmission mechanism

Abstract

The utility model belongs to the field of fluid machinery, and discloses a single constant-speed cam double-plunger transmission mechanism which comprises a main shaft, a constant-speed cam, two moving assemblies, two plungers and an elastic pressing reset assembly, the main shaft is driven by a worm and gear driving mechanism to rotate, the constant-speed cam is arranged on the main shaft in a sleeved mode and driven by the main shaft to rotate, and the two plungers are driven by the elastic pressing reset assembly to rotate. The two moving assemblies are located on the left side and the right side of the constant-speed cam respectively, the moving assemblies are matched with the cam face of the constant-speed cam, in the rotating process of the constant-speed cam, the two moving assemblies are driven by the constant-speed cam to synchronously move in the same direction, the two plungers are connected with the two moving assemblies in a one-to-one correspondence mode, and the plungers are inserted into the cylinder body in a sliding mode. The elastic pressing reset assembly pushes and pulls the two moving assemblies towards the direction of the constant-speed cam, so that the two moving assemblies are attached to the two sides of the cam face of the constant-speed cam. Only one cam needs to be arranged, the structure is simpler, cost is lower, the double plungers can be coaxially installed, the structure is more compact, and the size is smaller.

Description

Technical Field

[0001] The utility model relates to the field of fluid machinery, in particular to a single constant-speed cam double-plunger transmission mechanism. Background Art

[0002] A metering pump is a type of fluid conveying machinery, and its outstanding feature is that it can maintain a constant flow rate that is independent of the discharge pressure. The use of a metering pump can simultaneously complete the functions of conveying, metering and regulation, thereby simplifying the production process. Using multiple metering pumps, several media can be input into the process flow in an accurate proportion for mixing. Due to its own prominence, metering pumps have now been widely used in various industrial fields such as petrochemicals, pharmaceuticals, and food. A metering pump generally includes a worm gear drive mechanism, an eccentric rotary mechanism, a plunger reciprocating mechanism, and a pump head mechanism. The worm gear drive mechanism drives the eccentric rotary mechanism to move, and the eccentric wheel of the eccentric rotary mechanism drives the plunger in the plunger reciprocating mechanism to reciprocate. The plunger changes the pump chamber volume of the pump head mechanism, thereby achieving the purpose of conveying the medium.

[0003] A general metering pump has only one plunger, and the pump's suction capacity is not strong enough. A Chinese patent with publication number CN218293771U discloses a high-precision constant-speed cam metering pump with adjustable stroke. The metering pump adopts a double-plunger structure to improve the pump's suction capacity. A cam is installed at each end of the main shaft, and each cam cooperates with a transmission mechanism to drive the plunger to move. The problem is that the double-plunger structure of the metering pump has the problems of large size, complex structure and high cost. Utility Model Content

[0004] The utility model aims to provide a single constant-speed cam double-plunger transmission mechanism to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A single constant velocity cam double plunger transmission mechanism, comprising:

[0007] A main shaft, the main shaft being driven to rotate by a worm gear drive mechanism;

[0008] A constant velocity cam, wherein the constant velocity cam is sleeved on the main shaft and driven to rotate by the main shaft;

[0009] Two moving assemblies, the two moving assemblies are respectively located on the left and right sides of the constant velocity cam, the moving assemblies cooperate with the cam surface of the constant velocity cam, and during the rotation of the constant velocity cam, the two moving assemblies are driven by the constant velocity cam to move synchronously in the same direction;

[0010] Two plungers, the two plungers are connected to the two moving components in a one-to-one correspondence, and the plungers are slidably inserted in the cylinder body; and

[0011] An elastic pressing and resetting component pushes and pulls the two moving components toward the constant velocity cam, so that the two moving components fit with both sides of the cam surface of the constant velocity cam.

[0012] Furthermore, the moving assembly includes a fixed seat and a cylinder, the fixed seat is connected to the plunger, the cylinder is rotatably mounted on the fixed seat through a bearing, the axis of the cylinder is parallel to the axis of the main shaft, and the cylindrical surface of the cylinder is connected to the cam surface of the constant velocity cam.

[0013] Furthermore, the elastic pressing and resetting assembly is connected between the fixing seats of the two moving assemblies.

[0014] Furthermore, the elastic compression reset assembly includes a spring seat, a spring and a connecting rod. The spring seat is sleeved on a fixed seat of one of the moving assemblies. One end of the spring acts on the fixed seat, and the other end acts on the spring seat. The fixed seat also slides with the middle part of the connecting rod. One end of the connecting rod is fixedly connected to another fixed seat, and the other end of the connecting rod is fixedly connected to the spring seat.

[0015] Furthermore, the fixing seat comprises a fixing seat shaft portion and a fixing seat mounting portion, the fixing seat shaft portion is coaxially arranged with the plunger, the fixing seat mounting portion is arranged on a side of the fixing seat shaft portion close to the constant velocity cam, and the fixing seat mounting portion is mounted with a cylinder.

[0016] Furthermore, a fixed seat avoidance groove is provided on the fixed seat mounting portion, and the fixed seat avoidance groove avoids the constant velocity cam.

[0017] Furthermore, the spring is sleeved on the fixed seat shaft portion of the corresponding fixed seat, the spring seat is sleeved outside the spring, and has an inner stop ring at one end facing away from the constant velocity cam, one end of the spring is against the fixed seat mounting portion, and the other end is against the inner stop ring.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the utility model only needs to set up one constant-speed cam, the structure is simpler, the cost is lower, and the double plungers of the utility model can be coaxially installed, which has the advantages of compact structure and small size. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the cross-sectional structural schematic diagrams when the utility model is applied to a metering pump.

[0020] Figure 2 This is the second schematic diagram of the cross-sectional structure when the utility model is applied to a metering pump.

[0021] Figure 3This is the third schematic diagram of the cross-sectional structure when the utility model is applied to a metering pump.

[0022] Figure 4 It is a schematic diagram of the structure of the fixing seat in the utility model.

[0023] In the figure: main shaft 1, constant velocity cam 2, plunger 3, fixed seat 4, fixed seat shaft portion 400, fixed seat mounting portion 401, fixed seat avoidance groove 402, cylinder 5, bearing 6, connecting rod 7, spring 8, spring seat 9, inner retaining ring 900. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 4 A single constant velocity cam double plunger transmission mechanism comprises a main shaft 1, a constant velocity cam 2, two moving assemblies, two plungers 3 and an elastic pressing and resetting assembly. The main shaft 1 is driven to rotate by a worm gear driving mechanism. The constant velocity cam 2 is sleeved on the main shaft 1 and is driven to rotate by the main shaft 1. The two moving assemblies are respectively located on the left and right sides of the constant velocity cam 2. The moving assemblies cooperate with the cam surfaces of the constant velocity cam 2. During the rotation of the constant velocity cam 2, the two moving assemblies move synchronously in the same direction driven by the constant velocity cam 2. The two plungers 3 are connected to the two moving assemblies in a one-to-one correspondence. The plungers 3 are located on the side of the moving assembly facing away from the constant velocity cam 2. The plungers 3 are slidably inserted in the cylinder body. The elastic pressing and resetting assembly pushes and pulls the two moving assemblies toward the constant velocity cam 2, so that the two moving assemblies fit the two sides of the cam surfaces of the constant velocity cam 2.

[0026] It should be noted that the metering pump to which the utility model is applied has two cylinder bodies, and the two cylinder bodies are matched with the two plungers 3 in a one-to-one correspondence.

[0027] Continue reading Figure 1 and Figure 2 In one embodiment of the utility model, the moving assembly includes a fixed seat 4 and a cylinder 5, the fixed seat 4 is fixedly connected to the plunger 3, the cylinder 5 is rotatably mounted on the fixed seat 4 through two upper and lower bearings 6, the axis of the cylinder 5 is parallel to the axis of the main shaft 1, and the cylindrical surface of the cylinder 5 is connected to the cam surface of the constant velocity cam 2.

[0028] Continue reading Figure 4In one embodiment of the utility model, the fixed seat 4 includes a fixed seat shaft portion 400 and a fixed seat mounting portion 401. The fixed seat shaft portion 400 is coaxially arranged with the plunger 3 and fixedly connected with the plunger 3. The fixed seat mounting portion 401 is arranged on a side of the fixed seat shaft portion 400 close to the constant velocity cam 2, and has a vertically arranged mounting hole and a horizontally arranged fixed seat avoidance groove 402. The mounting hole is used to install the cylinder 5 through the upper and lower bearings 6, and the fixed seat avoidance groove 402 avoids the constant velocity cam 2.

[0029] Continue reading Figure 2 and Figure 3 In one embodiment of the utility model, an elastic compression reset component is connected between the fixed seats 4 of the two moving components, and there are multiple elastic compression reset components that are evenly arranged. The elastic compression reset component includes a spring seat 9, a spring 8 and a connecting rod 7. The spring seat 9 is sleeved on the fixed seat 4 of one of the moving components. The spring 8 is in a compressed state, one end of which acts on the fixed seat 4, and the other end acts on the spring seat 9. The fixed seat 4 also slides with the middle part of the connecting rod 7. One end of the connecting rod 7 is screwed and fixed to the other fixed seat 4, and the other end of the connecting rod 7 is fixedly connected to the spring seat 9 by bolts.

[0030] Specifically, the spring 8 is sleeved on the fixed seat shaft 400 corresponding to the fixed seat 4, and the spring seat 9 is sleeved outside the spring 8. Its end facing away from the constant velocity cam 2 has an inner stop ring 900. One end of the spring 8 abuts against the fixed seat mounting portion 401, and the other end abuts against the inner stop ring 900.

[0031] It should be noted that the above-mentioned moving assembly and elastic pressing and resetting assembly are both slidably inserted into the housing of the metering pump.

[0032] When the metering pump is working, the worm gear drive mechanism drives the main shaft 1 to rotate, the main shaft 1 drives the constant velocity cam 2 to rotate, the constant velocity cam 2 drives the left and right moving components to move synchronously in the same direction, and the moving components drive the corresponding plungers 3 to move in the corresponding cylinder body, so as to realize the advance and retreat of the two plungers 3 of the metering pump, and the plungers 3 squeeze the corresponding diaphragms in the pump head mechanism through reciprocating motion and corresponding media, thereby changing the volume of the corresponding pump head cavity, and then realizing the suction and discharge of the pump head cavity. When the constant velocity cam 2 drives the moving component and plunger 3 on one side to move in the direction away from the constant velocity cam 2, the moving component and plunger 3 on the other side move in the direction close to the constant velocity cam 2 under the action of the elastic compression reset component.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single constant velocity cam double plunger transmission mechanism, characterized in that: include: A main shaft (1), the main shaft (1) being driven to rotate by a worm gear drive mechanism; A constant-speed cam (2), wherein the constant-speed cam (2) is sleeved on the main shaft (1) and driven to rotate by the main shaft (1); Two moving assemblies, the two moving assemblies being respectively located on the left and right sides of the constant velocity cam (2), the moving assemblies cooperating with the cam surface of the constant velocity cam (2), and during the rotation of the constant velocity cam (2), the two moving assemblies being driven by the constant velocity cam (2) to move synchronously in the same direction; Two plungers (3), the two plungers (3) being connected to the two moving components in a one-to-one correspondence, and the plungers (3) being slidably inserted into the cylinder body; as well as An elastic pressing and resetting component pushes and pulls the two movable components in the direction of the constant velocity cam (2), so that the two movable components fit with both sides of the cam surface of the constant velocity cam (2).

2. A single constant velocity cam dual plunger transmission mechanism according to claim 1, characterized in that: The moving assembly comprises a fixed seat (4) and a cylinder (5), wherein the fixed seat (4) is connected to the plunger (3), and the cylinder (5) is rotatably mounted on the fixed seat (4) via a bearing (6), the axis of the cylinder (5) is parallel to the axis of the main shaft (1), and the cylindrical surface of the cylinder (5) is connected to the cam surface of the constant velocity cam (2).

3. A single constant velocity cam dual plunger transmission mechanism according to claim 2, characterized in that: The elastic pressing and resetting assembly is connected between the fixing seats (4) of the two moving assemblies.

4. A single constant velocity cam dual plunger transmission mechanism according to claim 3, characterized in that: The elastic compression reset assembly comprises a spring seat (9), a spring (8) and a connecting rod (7); the spring seat (9) is sleeved on a fixed seat (4) of one of the movable assemblies; one end of the spring (8) acts on the fixed seat (4) and the other end acts on the spring seat (9); the fixed seat (4) is also slidably matched with the middle part of the connecting rod (7); one end of the connecting rod (7) is fixedly connected to the other fixed seat (4) and the other end of the connecting rod (7) is fixedly connected to the spring seat (9).

5. A single constant velocity cam dual plunger transmission mechanism according to claim 4, characterized in that: The fixed seat (4) comprises a fixed seat shaft portion (400) and a fixed seat mounting portion (401); the fixed seat shaft portion (400) is coaxially arranged with the plunger (3); the fixed seat mounting portion (401) is arranged on a side of the fixed seat shaft portion (400) close to the constant velocity cam (2), and is mounted with a cylinder (5).

6. A single constant velocity cam dual plunger transmission mechanism according to claim 5, characterized in that: The fixed seat mounting portion (401) is provided with a fixed seat avoidance groove (402), and the fixed seat avoidance groove (402) avoids the constant velocity cam (2).

7. A single constant velocity cam dual plunger transmission mechanism according to claim 5, characterized in that: The spring (8) is sleeved on a fixed seat shaft portion (400) corresponding to the fixed seat (4); the spring seat (9) is sleeved outside the spring (8); an end of the spring seat (9) facing away from the constant velocity cam (2) is provided with an inner stop ring (900); one end of the spring (8) abuts against the fixed seat mounting portion (401), and the other end abuts against the inner stop ring (900).

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