Stroke adjusting mechanism of reciprocating metering pump

Abstract

The utility model relates to a stroke adjusting mechanism of a reciprocating metering pump, and relates to the technical field of metering pumps, the stroke adjusting mechanism comprises a shell, a bracket mounted at the top end of the shell, a driving assembly rotationally arranged in the bracket and an adjusting screw rod penetrating into the shell along the axis of the shell, and an adjusting sleeve in threaded connection with the adjusting screw rod is mounted on the shell; a connecting cylinder is rotatably mounted at one end, far away from the adjusting screw rod, in the shell, a butt joint gear sleeves the connecting cylinder, a sliding shaft is slidably arranged in the connecting cylinder, a connecting assembly is arranged on the sliding shaft, an eccentric wheel rotatably sleeves the sliding shaft, a kidney-shaped hole is formed in the sliding shaft in a penetrating manner, an included angle is formed between the center line of the kidney-shaped hole and the axis of the sliding shaft, and a limiting pin is slidably arranged in the kidney-shaped hole in a penetrating manner; the two ends of the limiting pin extend out of the kidney-shaped hole and are connected with an eccentric wheel which is connected with a piston assembly. The stroke adjusting mechanism is improved through the sliding shaft structure, the piston rod can be kept static in the process of adjusting the position of the eccentric wheel when equipment is not started, and the stability of the power end structure is protected.

Description

Technical Field

[0001] The present application relates to the field of metering pump technology, and in particular to a stroke adjustment mechanism of a reciprocating metering pump. Background Art

[0002] Metering pumps, also known as proportional pumps, can easily and accurately adjust the eccentric distance of the eccentric wheel to change the plunger stroke when changing the liquid delivery volume. In the chemical industry, metering pumps can adjust the flow rate by adjusting the plunger stroke length. Metering pump stroke adjustment can be divided into manual stroke adjustment, electric stroke adjustment, and pneumatic stroke adjustment. Electric stroke adjustment has obvious advantages due to its efficiency and accuracy, especially when the pump operates continuously.

[0003] Existing metering pumps often utilize an N-axis or crankshaft structure for stroke adjustment, which inevitably causes the piston rod to undergo linear reciprocating motion during the stroke adjustment process. When the metering pump is not operating, the lubricating oil cannot fully lubricate the interior of the stroke adjustment mechanism. Adjusting the position of the eccentric wheel within the metering pump can cause compression between the power end components, reducing the structural strength and lifespan of the stroke adjustment mechanism's components. Utility Model Content

[0004] In order to improve the structure of the stroke adjustment mechanism in the metering pump so that it has a simpler structure and can ensure that the piston rod can remain stationary during the process of adjusting the eccentric wheel position when the equipment is not started, thereby achieving the effect of protecting the stability of the power end structure in the stroke adjustment mechanism, the present application provides a stroke adjustment mechanism for a reciprocating metering pump.

[0005] The stroke adjustment mechanism of a reciprocating metering pump provided in this application adopts the following technical solution:

[0006] The cam is secured to the upper and lower ends of the cam, and the cam is secured to the lower ends of the cam, and the cam is secured to the lower ends of the cam.

[0007] By adopting the above technical solution, the driving assembly drives the connecting cylinder to rotate through the docking gear, and the connecting cylinder drives the sliding shaft and the eccentric wheel to rotate in the housing, thereby converting the rotational power into a linear driving force of the piston assembly. In this process, since the sliding shaft is rotatably connected to the adjusting screw through the connecting assembly, when the adjusting screw rotates, the sliding shaft will be displaced along the axial direction, and the limit pin will slide in the waist-shaped hole. Since both ends of the limit pin are connected to the eccentric wheel, the radial distance between the eccentric wheel and the sliding shaft axis will change. The structure is simple and easy to operate. Compared with the stroke adjustment mechanism of the metering pump on the market, it has a smaller space occupation volume and a smaller stroke adjustment load, which reduces the manufacturing cost of the metering pump.

[0008] Optionally, the connecting assembly includes a coupling sleeve rotatably mounted on the end of the sliding shaft away from the connecting tube and two first bearings symmetrically arranged in the coupling sleeve, the ends of the sliding shaft and the adjusting screw that are close to each other are both extended into the coupling sleeve, and the two first bearings are transitionally connected to the sliding shaft and the adjusting screw respectively, and there is a gap between the two ends of the adjusting screw and the sliding shaft that are close to each other.

[0009] By adopting the above technical solution, when the adjusting screw rotates, it will push the coupling sleeve and the sliding shaft to move along the axial direction, and the rotation of the structure on the sliding shaft will not affect the adjusting mechanism, thereby greatly reducing the load of the adjusting mechanism when adjusting the radial position of the eccentric wheel, so that the adjusting mechanism can avoid the influence of the eccentric wheel and the structure that drives the eccentric wheel to rotate.

[0010] Optionally, both ends of the coupling sleeve are symmetrically provided with limit grooves connected to the ends of the coupling sleeve, the two first bearings are respectively rotatably arranged in the two limit grooves, and the two first bearings are each provided with a retaining ring rotatably connected to the limit groove at one end away from the bottom of the limit groove.

[0011] By adopting the above technical solution, it is possible to avoid the two first bearings sliding in the coupling sleeve during the rotation of the adjusting screw and the sliding shaft, resulting in separation between the coupling sleeve and the sliding shaft and the adjusting screw, and ultimately making the adjusting mechanism unable to work normally, thereby improving the stability of the device operation.

[0012] Optionally, a support sleeve is fixedly provided on the inner wall of the shell along the axis of the adjusting screw, and one end of the support sleeve away from the side wall of the shell is rotatably sleeved on the coupling sleeve.

[0013] By adopting the above technical solution, support can be provided for the coupling sleeve, preventing the weight of the coupling sleeve from being distributed to the adjusting screw and the sliding shaft, thereby increasing the rotational load of the two, making the stroke adjustment of the metering pump more agile, and also reducing the energy consumption of the drive mechanism.

[0014] Optionally, the drive assembly includes a transmission rod inserted into the shell and meshed with the docking gear, a first docking block integrally installed on the end of the transmission rod away from the shell, and a second docking block engaged with the first docking block along the axis, and a side where the first docking block and the second docking block are close to each other is integrally connected with a plurality of one-to-one corresponding first card blocks and second card blocks along the circumferential direction, and the second connecting block is connected to a motor at one end away from the first connecting block.

[0015] By adopting the above technical solution, the first docking block and the second docking block are clamped, and the transmission rod is rotated under the drive of the motor. Since the first docking block and the second docking block are detachable, the drive assembly can be adapted to motors of different models, thereby improving the adaptability range of the metering pump to the parts used.

[0016] Optionally, the piston assembly includes a piston cylinder connected to one side of the shell, a limiting sleeve integrally arranged on the side of the piston cylinder close to the shell, and a piston rod slidingly inserted into the limiting sleeve, the end of the piston cylinder away from the piston cylinder passes through the limiting sleeve and is hinged with a push rod, the end of the push rod away from the piston rod extends into the shell and is rotatably sleeved on the eccentric wheel.

[0017] By adopting the above technical solution, when the eccentric wheel rotates, the limiting sleeve rotates and is sleeved on the eccentric wheel, so the eccentric wheel will drive the limiting sleeve to move, thereby causing the piston rod hinged to the propulsion rod to perform linear reciprocating motion, simplifying the structure of converting the rotation of the limiting sleeve into linear motion of the piston rod, and at the same time improving the stability of the operation of the structure.

[0018] Optionally, an adjustment hole communicating with the interior of the adjustment sleeve is radially opened on the side surface of the adjustment sleeve, a stop pin for limiting the rotation of the adjustment screw is threaded through the adjustment hole, and the end of the stop pin abuts against the adjustment screw.

[0019] By adopting the above technical solution, when there is no need to adjust the stroke of the metering pump, the stop pin can be rotated to make its end press against the adjusting screw, thereby preventing the adjusting screw from displacing itself when the metering pump shakes, thereby improving the stability of the equipment operation.

[0020] Optionally, an adjusting collar is fixedly sleeved on one end of the adjusting screw away from the housing, and a plurality of adjusting handles are fixedly mounted on the adjusting collar along the circumference.

[0021] By adopting the above technical solution, it is convenient to adjust the adjusting screw more accurately, thereby improving the accuracy and convenience of adjusting the stroke of the metering pump stroke adjustment mechanism.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. This application uses a sliding shaft structure to adjust the position of the eccentric wheel inside the stroke adjustment mechanism of the metering pump. This allows the piston rod to remain stationary during the adjustment of the eccentric wheel position when the equipment is not in operation, thereby preventing the piston rod from moving when the lubricating oil is not fully working, resulting in squeezing or severe wear of equipment parts.

[0024] 2. This application adjusts the position of the eccentric wheel inside the stroke adjustment mechanism of the metering pump by setting a sliding shaft structure, so that adjusting the position of the eccentric wheel during the operation of the equipment will not affect the operation of the piston rod, thereby improving the stability of the equipment operation.

[0025] 3. This application simplifies the stroke adjustment structure of the metering pump by providing an eccentric wheel structure sleeved on the connecting cylinder and an adjusting screw structure threadedly connected to the adjusting sleeve, thereby reducing the manufacturing cost of the metering pump;

[0026] 4. This application separates the structure for adjusting the radial position of the eccentric wheel from the structure for driving the eccentric wheel to rotate by providing a connecting assembly connected to the sliding shaft and the adjusting screw, thereby reducing the operating load of the adjusting structure and the energy consumption of the driving device;

[0027] 5. This application provides a coaxial eccentric radial position adjustment structure and an eccentric rotation drive structure, so that the overall space volume occupied by the stroke adjustment mechanism of the metering pump is smaller than that of the structure in a general metering pump, making the metering pump more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a stroke adjustment mechanism of a reciprocating metering pump of the present application.

[0029] Figure 2 yes Figure 1 Magnified view at point A in the middle.

[0030] Figure 3 yes Figure 1 Cross-sectional view at AA in the middle.

[0031] Figure 4 This is a schematic diagram of the internal structure of the shell of a stroke adjustment mechanism of a reciprocating metering pump in the present application.

[0032] Figure 5 yes Figure 4 Exploded view of the overall structure.

[0033] Figure 6It is an overall schematic diagram of the connection components of the stroke adjustment mechanism of a reciprocating metering pump of the present application.

[0034] Figure 7 This is a structural explosion view of a connecting assembly of a stroke adjustment mechanism of a reciprocating metering pump of the present application.

[0035] Figure 8 It is a structural schematic diagram of a drive assembly of a stroke adjustment mechanism of a reciprocating metering pump of the present application.

[0036] Figure 9 This is an overall view of the interior of the housing of the stroke adjustment mechanism of a reciprocating metering pump of the present application and the connection structure of the piston assembly.

[0037] Explanation of the accompanying drawings: 1. Housing; 11. Adjusting screw; 111. Adjusting hole; 112. Stop pin; 12. Support sleeve; 2. Bracket; 3. Drive assembly; 31. Transmission rod; 32. First docking block; 321. First clamping block; 33. Second docking block; 331. Second clamping block; 34. Connecting short shaft; 4. Adjusting screw; 41. Adjusting collar; 411. Adjusting handle; 5. Connecting cylinder; 51. Docking gear; 6. Sliding shaft; 61. Waist-shaped hole; 62. Limit pin; 63. Eccentric wheel; 7. Connecting assembly; 71. Coupling sleeve; 711. Limiting groove; 72. First bearing; 73. Retaining ring; 8. Piston assembly; 81. Piston cylinder; 82. Limiting sleeve; 83. Piston rod; 84. Propelling rod. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-9 This application is described in further detail.

[0039] The embodiments of the present application disclose a stroke adjustment mechanism for a reciprocating metering pump.

[0040] Reference Figure 1 and Figure 2 A stroke adjustment mechanism for a reciprocating metering pump is used to adjust the flow rate of liquid in and out of the metering pump. It mainly includes a housing 1 for mounting internal parts, a bracket 2 rotatably mounted on the upper end of the housing 1, a drive assembly 3 rotatably mounted on the bracket 2, and an adjustment screw 4 extending horizontally along one end of the axis into the interior of the housing 1. An adjustment screw barrel 11 coaxial with the adjustment screw 4 is detachably mounted on the housing 1 and is threadedly connected to the adjustment screw 4 so that the adjustment screw 4 can move along the axis. An adjustment hole 111 is radially opened on the side of the adjustment screw barrel 11 close to the bracket 2 and communicates with the interior of the adjustment screw barrel 11. A stop pin 112 is threaded through the inner thread of the adjustment hole 111 to limit the rotation of the adjustment screw 4.

[0041] When the position of the adjusting screw 4 needs to be fixed to prevent the adjusting screw 4 from moving axially due to accidental touch or shaking of the metering pump, the stop pin 112 can be rotated so that its end abuts against the adjusting screw 4 to stop the adjusting screw 4.

[0042] Preferably, one end of the adjusting screw 4 extending outside the housing 1 is fixedly sleeved with an adjusting collar 41, and the adjusting collar 41 is integrally provided with a plurality of adjusting handles 411 along the circumferential direction on the side surface so that the operator can more smoothly adjust the movement of the adjusting screw 4 along the axis.

[0043] Reference Figure 3 、 Figure 4 and Figure 5 Furthermore, a connecting cylinder 5 is rotatably disposed within the housing 1 transversely to the end away from the adjusting screw 4. A docking gear 51 is also sleeved on the connecting cylinder 5 and connected to the drive assembly 3 for driving the connecting cylinder 5 to rotate. A sliding shaft 6 is slidably disposed within the connecting cylinder 5, one end of which extends through the connecting cylinder 5 near the end of the adjusting screw 4. The sliding shaft 6 comprises two sections, one with a square cross-section and the other with a circular cross-section. The square cross-section portion of the sliding shaft 6 is slidably connected to the connecting cylinder 5, while the circular cross-section portion is rotatably connected to a connecting assembly 7, the other end of which is rotatably connected to the adjusting screw 4.

[0044] Reference Figure 5 and Figure 6 Furthermore, a section of the sliding shaft 6 with a square cross-section extends through the connecting tube 5, and a waist-shaped hole 61 is formed through the portion extending through the connecting tube 5. The waist-shaped hole 61 forms an angle with the longitudinal centerline of the sliding shaft 6, and the angle is less than 45°. A stop pin 62 is slidably disposed within the waist-shaped hole 61 along its length, with both ends extending through the sliding shaft 6. The sliding shaft 6 is also sleeved with an eccentric 63, with both ends of the stop pin 62 extending through the eccentric 63 and neither end extending beyond the eccentric 63.

[0045] Reference Figure 6 and Figure 7 Specifically, the connecting assembly 7 includes two first bearings 72 fixedly mounted on the adjacent ends of the sliding shaft 6 and the adjusting screw 4, and a coupling sleeve 71 rotatably connected to the two first bearings 72. The two first bearings 72 are symmetrically distributed along the axis of the coupling sleeve 71. A gap is provided between the adjacent ends of the sliding shaft 6 and the adjusting screw 4 to prevent them from interfering with each other's rotation.

[0046] Reference Figure 7Preferably, a limiting groove 711 is formed at both ends of the coupling sleeve 71 along the axis thereof and is communicated with the end of the coupling sleeve 71. The two first bearings 72 are rotatably mounted in the two limiting grooves 711. A retaining ring 73 is provided in each of the two first bearings 72 to prevent the first bearings 72 from falling out, so that the connecting assembly 7 can be disassembled smoothly and parts can be quickly replaced.

[0047] Preferably, a support sleeve 12 is fixedly mounted on the inner wall of the housing 1, coaxially with the adjusting screw 4. The side of the support sleeve 12, facing away from the inner wall of the housing 1, is flexibly connected to the coupling sleeve 71. This prevents the entire weight of the coupling sleeve 71 from being applied to the adjusting screw 4 and the sliding shaft 6, thereby increasing the load during their movement. Furthermore, since the coupling sleeve 71 also moves along its axis during the rotation of the adjusting screw 4, the design of the support sleeve 12 ensures smoother movement of the coupling sleeve 71.

[0048] Reference Figure 8 and Figure 9 The drive assembly 3 specifically includes a transmission rod 31 that is inserted into the interior of the housing 1 and meshes with the docking gear 51. The end of the transmission rod 31 away from the housing 1 extends into the bracket 2 and is fixedly connected to the first docking block 32. A second docking block 33 is provided inside the bracket 2. The ends of the first docking block 32 and the second docking block 33 that are close to each other are respectively integrally provided with a plurality of first clamping blocks 321 and a plurality of second clamping blocks 331 along the circumferential direction. The plurality of first clamping blocks 321 and the plurality of second clamping blocks 331 correspond to each other one-to-one and are mutually engaged. The end of the second docking block 33 away from the first docking block 32 is integrally provided with a connecting short shaft 34 along the axis for connecting to the motor to drive it to rotate.

[0049] The purpose of designing the first docking block 32 and the second docking block 33 to be connected in this application is to enable the stroke adjustment mechanism of the metering pump to adapt to various types of motors in actual operation, with a wider range of applications and broad assembly requirements.

[0050] Reference Figure 9 In addition, a piston assembly 8 is connected to the eccentric wheel 63. The piston assembly 8 includes a piston cylinder 81 connected to one side of the housing 1, a limiting sleeve 82 integrally provided with the piston cylinder 81 on the side near the housing 1, and a piston rod 83 slidably inserted into the limiting sleeve 82. A propulsion rod 84 is hingedly connected to the end of the piston rod 83 near the housing 1. The end of the propulsion rod 84, which is remote from the piston rod 83, extends into the interior of the housing 1 and is rotatably connected to the eccentric wheel 63 to convert the eccentric rotational motion of the eccentric wheel 63 into linear reciprocating motion of the piston rod 83.

[0051] The implementation principle of the stroke adjustment mechanism of a reciprocating metering pump in the embodiment of the present application is as follows:

[0052] The motor drives the transmission rod 31, causing the mating gear 51 meshing with the transmission rod 31 to rotate the connecting cylinder 5 and the sliding shaft 6, which is slidably connected to the connecting cylinder 5, providing rotational power for the eccentric wheel 63. The operator then rotates the adjustment knob 411, causing the adjustment screw 4 to move along its axis. Since the adjustment screw 4 is connected to the sliding shaft 6 via the coupling sleeve 71, it pushes the sliding shaft 6 and the connecting cylinder 5 in the axial direction.

[0053] During the movement of the sliding shaft 6, the coupling sleeve 71 engages with the connecting tube 5, causing the limit pin 62 to slide along the length of the waist-shaped hole 61. The eccentric wheel 63, which is connected to the limit pin 62 and sleeved on the sliding shaft 6, moves radially as the limit pin 62 moves, thereby changing the eccentric distance and indirectly adjusting the stroke of the piston rod 83.

[0054] In this application, since the sliding shaft 6 and the adjusting screw 4 are connected together through the coupling sleeve 71 and the two first bearings 72, during the stroke adjustment of the metering pump, the rotation of the sliding shaft 6 and the adjusting screw 4 will not affect the movement of the two along the axial direction.

[0055] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A stroke adjustment mechanism for a reciprocating metering pump, comprising a housing (1), a bracket (2) mounted on the top end of the housing (1), a drive assembly (3) rotatably disposed within the bracket (2), and an adjusting screw (4) rotatably disposed along the axis of the housing (1) and penetrating the housing (1), characterized in that: The housing (1) is provided with an adjusting sleeve threadedly connected to the adjusting screw (4); a connecting cylinder (5) is rotatably installed in the housing (1) at one end away from the adjusting screw (4); a docking gear (51) connected to the driving assembly (3) is sleeved on the connecting cylinder (5); a sliding shaft (6) with one end passing through the connecting cylinder (5) is slidably provided in the connecting cylinder (5); and a connecting assembly (7) for rotatably connecting to the adjusting screw (4) is provided on the sliding shaft (6); an eccentric wheel (63) is rotatably sleeved on the sliding shaft (6); a waist-shaped hole (61) with an angle between the center line and the axis of the sliding shaft (6) is opened through the sliding shaft (6); a limiting pin (62) is slidably penetrated in the waist-shaped hole (61); both ends of the limiting pin (62) extend out of the waist-shaped hole (61) and are connected to the eccentric wheel (63); and the eccentric wheel (63) is connected to the piston assembly (8).

2. A stroke adjustment mechanism for a reciprocating metering pump according to claim 1, characterized in that: The connecting assembly (7) includes a coupling sleeve (71) rotatably sleeved on one end of the sliding shaft (6) away from the connecting tube (5) and two first bearings (72) symmetrically rotatably arranged in the coupling sleeve (71), the ends of the sliding shaft (6) and the adjusting screw (4) close to each other are both extended into the coupling sleeve (71), and the two first bearings (72) are transitionally connected to the sliding shaft (6) and the adjusting screw (4) respectively, and there is a gap between the two ends of the adjusting screw (4) and the sliding shaft (6) close to each other.

3. The stroke adjustment mechanism of a reciprocating metering pump according to claim 2, characterized in that: The two ends of the coupling sleeve (71) are symmetrically provided with limiting grooves (711) connected to the ends of the coupling sleeve (71), and the two first bearings (72) are rotatably arranged in the two limiting grooves (711), and the two first bearings (72) are both provided with a retaining ring (73) rotatably connected to the limiting groove (711) at one end of the groove bottom away from the limiting groove (711).

4. A stroke adjustment mechanism for a reciprocating metering pump according to claim 3, characterized in that: A support sleeve (12) is fixedly provided on the inner wall of the housing (1) along the axis of the adjusting screw (4), and one end of the support sleeve (12) away from the side wall of the housing (1) is rotatably sleeved on the coupling sleeve (71).

5. The stroke adjustment mechanism of a reciprocating metering pump according to claim 1, characterized in that: The driving assembly (3) comprises a transmission rod (31) inserted into the housing (1) and meshed with the docking gear (51), a first docking block (32) integrally mounted on an end of the transmission rod (31) away from the housing (1), and a second docking block (33) engaged with the first docking block (32) along an axis, wherein a plurality of first clamping blocks (321) and second clamping blocks (331) corresponding to each other are integrally connected along a circumferential direction on a side where the first docking block (32) and the second docking block (33) are close to each other, and a motor is connected to the end of the second connecting block away from the first connecting block.

6. The stroke adjustment mechanism of a reciprocating metering pump according to claim 1, characterized in that: The piston assembly (8) comprises a piston cylinder (81) connected to one side of the housing (1), a limiting sleeve (82) integrally arranged on the side of the piston cylinder (81) close to the housing (1), and a piston rod (83) slidingly inserted into the limiting sleeve (82), wherein the end of the piston rod (83) away from the piston cylinder (81) passes through the limiting sleeve (82) and is hingedly connected to a propulsion rod (84), wherein the end of the propulsion rod (84) away from the piston rod (83) extends into the housing (1) and is rotatably sleeved on the eccentric wheel (63).

7. The stroke adjustment mechanism of a reciprocating metering pump according to claim 1, characterized in that: An adjusting hole (111) communicating with the interior of the adjusting sleeve is radially opened on the side surface of the adjusting sleeve, and a stop pin (112) for limiting the rotation of the adjusting screw (4) is threaded through the internal thread of the adjusting hole (111), and the end of the stop pin (112) abuts against the adjusting screw (4).

8. The stroke adjustment mechanism of a reciprocating metering pump according to claim 1, characterized in that: An adjusting collar (41) is fixedly sleeved on one end of the adjusting screw (4) away from the housing (1), and a plurality of adjusting handles (411) are fixedly mounted on the adjusting collar (41) along the circumference.

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