Four-pump-head plunger type metering pump

Abstract

The utility model discloses a four-pump-head plunger type metering pump, which relates to the technical field of metering pumps, and is characterized in that the four-pump-head plunger type metering pump comprises a transmission shaft, eccentric wheels are fixedly arranged at the two ends of the transmission shaft, eccentric shafts are eccentrically arranged on the sides, away from the transmission shaft, of the eccentric wheels, and the eccentric shafts are arranged on the transmission shaft. Two groups of connecting rods are rotationally arranged on each eccentric shaft and are distributed on the two sides of the corresponding eccentric shaft; the cross head is arranged at the end, away from the eccentric shaft, of the connecting rod, the end, close to the connecting rod, of the cross head is hinged to the connecting rod through a cross head pin, and the periphery of the cross head is sleeved with a cross head bush which is used for guiding the cross head in the axial direction and limiting the cross head to reciprocate in the axial direction. The four pump heads are driven by the second motor, the flow and the discharge pressure of each pump head can be different, and quantitative output of different media or the same medium at the same injection point or different injection points can be completed.

Description

Technical Field

[0001] The utility model relates to the technical field of metering pumps, in particular to a four-pump-head plunger-type metering pump. Background Art

[0002] A metering pump is a fluid machine that can quantitatively transport fluid media. Its biggest feature is that it can meter and transport all kinds of different media that can flow. The most widely used purpose is to meter and transport the transported medium. A plunger metering pump is a reciprocating positive displacement pump whose plunger stroke volume can be changed. There are many ways to change the plunger stroke volume. The most commonly used method is to change the output flow of the pump by changing the reciprocating stroke of the plunger, thereby achieving metered delivery of the transported medium. In addition, the metering pump must have a unique plunger stroke adjustment mechanism that can adjust the plunger stroke. The flow rate can be adjusted steplessly from 0 to 100% as needed.

[0003] Due to the adjustable flow rate characteristics of metering pumps, they have been widely used in chemical industry, petroleum, papermaking, food, plastics, pharmaceuticals, daily chemicals, water treatment, etc. Metering pumps are often used to transport highly corrosive liquids, suspensions, molten fluids, radioactive liquids, flammable and explosive liquids, some toxic chemical liquids, etc.

[0004] The metering pump is generally composed of a motor 100, a transmission end, a hydraulic end mechanism 600, and a base 300. Figure 1 and Figure 2 The transmission end is usually composed of a reduction mechanism, a transmission mechanism 400, a plunger stroke adjustment mechanism, etc. The hydraulic end mechanism 600 is usually composed of a plunger, a plunger seal, a stuffing box, a cylinder body, an inlet and outlet check valve, an inlet and outlet pipe, etc.

[0005] In some process flows, it is necessary to add different types of fluid chemical raw materials together in different proportions, or to transport the same fluid chemical raw material to different injection points according to different parameters. Under such working conditions, multiple metering pumps are usually required to complete the work, but it is also possible to remove the transmission end of the motor of multiple metering pumps and connect them together in parallel according to the structural characteristics of the metering pumps, and connect them in the middle with a coupling 200 to form a pump group. A motor 100 is connected to one end of the pump group with a coupling, and driven by a motor 100. Each transmission mechanism 400 and a hydraulic end mechanism 600 form a unit, and each unit has an independent stroke adjustment mechanism 500. Multiple units are combined together to form a multi-pump head pump, see Figure 3 and Figure 4 This multi-pump head pump can meet the process requirements of the above working conditions.

[0006] The utility model provides a plunger-type metering pump with four pump heads, which can adjust the pumping volume individually. Summary of the invention

[0007] The utility model provides a four-pump-head plunger-type metering pump, which has the advantage of being able to individually adjust the pumping volume, so as to solve the above-mentioned problem.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a four-pump-head plunger metering pump, characterized in that it includes: a transmission shaft, both ends of the transmission shaft are fixedly provided with eccentric wheels, an eccentric shaft is eccentrically provided on the side of the eccentric wheel away from the transmission shaft, two groups of connecting rods are rotatably provided on the single eccentric shaft, and the two groups of connecting rods are distributed on both sides of the eccentric shaft; a crosshead, the crosshead is provided at one end of the connecting rod away from the eccentric shaft, the end of the crosshead close to the connecting rod is hinged with the connecting rod through a crosshead pin, and a crosshead bushing is provided on the outer sleeve of the crosshead for axially guiding the crosshead and limiting the axial reciprocation of the crosshead; a hydraulic end, the hydraulic end is located on the side of the crosshead away from the connecting rod, a liquid cylinder cavity is provided in the hydraulic end, and a plunger is provided in the liquid cylinder cavity; a plunger stroke adjustment mechanism, the plunger stroke adjustment mechanism is used to connect the crosshead and the plunger, and can adjust the distance between the plunger and the crosshead to change the position of the plunger in the liquid cylinder cavity, thereby changing the output flow of the pump; a driving mechanism, the driving mechanism is connected to the transmission shaft and is used to drive the transmission shaft to rotate.

[0009] As a preferred technical solution of the utility model, the plunger stroke adjustment mechanism includes: a stroke adjustment screw, an internal threaded hole is provided in one end of the crosshead close to the plunger, and one end of the stroke adjustment screw is threadedly connected to the internal threaded hole; a stroke adjustment piston, the stroke adjustment piston is installed in the stroke adjustment screw, and a boss is provided at one end of the stroke adjustment piston close to the crosshead pin, and the outer circle of the boss is larger than the inner hole of the stroke adjustment screw, which plays a limiting role. The other end of the stroke adjustment piston is fixedly connected to the plunger, and the distance between the stroke adjustment piston and the crosshead can be adjusted by adjusting the position of the stroke adjustment screw in the internal threaded hole to change the position of the plunger in the cylinder cavity.

[0010] As a preferred technical solution of the utility model, the hydraulic end is installed on the machine base and is coaxial with the crosshead; one end of the machine base is used to support the crosshead bushing and the crosshead, and the other end of the machine base supports the hydraulic end, and a liquid collecting tank is provided in the area of ​​the machine base opposite to the plunger for collecting leaked liquid.

[0011] As a preferred technical solution of the utility model, a ruler is provided on the upper surface of the machine base, which is used as a reference line for adjusting the length of the stroke adjustment piston.

[0012] As a preferred technical solution of the utility model, the driving mechanism includes: a worm gear shaft, which is a straight cylindrical shaft with a cavity, the transmission shaft is located in the worm gear shaft and rotates synchronously with the worm gear shaft; a worm wheel, which is fixed to the periphery of the worm gear shaft, and a worm is meshed on one side of the worm wheel; and a second motor, which is arranged on one side of the worm and is used to drive the worm to rotate.

[0013] As a preferred technical solution of the utility model, the worm wheel is fixedly connected to the worm wheel shaft through a flat key so that the worm wheel and the worm wheel shaft rotate synchronously.

[0014] As an optimal technical solution of the utility model, it also includes a base two, a transmission box is provided on the outside of the worm, and the transmission box is fixed on the base two; the worm is arranged horizontally, one end of the worm extends out of the transmission box, an axial center part of the extended end of the worm is provided with an axial worm hole, a keyway is provided in the worm hole, the shaft head of the second motor is inserted into the worm hole, and the torque is transmitted through the key; the second motor is fixed to the motor bracket by bolts, and the motor bracket and the transmission box are fixedly connected by bolts; the two ends of the worm shaft are supported on the rolling bearing seat, and the rolling bearing seat is installed on the transmission box by bolts.

[0015] As a preferred technical solution of the utility model, the eccentric shaft is provided with an external thread at one end close to the eccentric wheel, a threaded hole is provided at the eccentric end face of the eccentric wheel, and the eccentric shaft is fixed to the eccentric wheel through the external thread and the threaded hole.

[0016] Compared with the prior art, the utility model provides a four-pump-head plunger metering pump, which has the following beneficial effects:

[0017] This four-pump plunger metering pump uses one motor to drive four pump heads. The flow rate and discharge pressure of each pump head can be different, and quantitative output of different media or the same medium at the same injection point or different injection points can be completed. The overall structure is compact, the reduction structure is arranged in the middle of the pump, the output is at both ends of the transmission shaft, and the four hydraulic end mechanisms of the pump are arranged at the four corners of the base. Reduce the equipment space, easy to operate and maintain. After being put into use, the pump has achieved good economic benefits and is mainly used in the oil extraction department as a chemical injection pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a metering pump in the prior art;

[0019] Figure 2 It is a side view of a metering pump in the prior art;

[0020] Figure 3 It is a front view of a pump unit in the prior art;

[0021] Figure 4It is a side view of a pump unit in the prior art;

[0022] Figure 5 This is a schematic diagram of the main internal structure of the utility model;

[0023] Figure 6 It is a top view schematic diagram of the internal structure of the utility model;

[0024] Figure 7 For this utility model Figure 6 A magnified image of area A;

[0025] Figure 8 For this utility model Figure 6 Magnified view of area B.

[0026] In the figure: 100, motor 1; 200, coupling; 300, base 1; 400, transmission mechanism; 500, stroke adjustment mechanism; 600, hydraulic end mechanism 1;

[0027] 1. Motor 2; 2. Motor bracket; 3. Worm hole; 4. Transmission box; 5. Worm; 6. Connecting rod; 8. Eccentric wheel; 9. Cross pin; 10. Cross bushing; 11. Sealing ring; 12. Cross head; 13. Locking nut; 14. Hydraulic end; 15. Liquid collecting tank; 17. Stroke adjustment piston; 18. Stroke adjustment screw; 19. Machine base; 20. Worm bearing; 21. Eccentric shaft; 22. Retaining ring; 23. Transmission shaft; 25. Worm gear shaft; 26. Rolling bearing seat; 27. Scale; 28. Worm wheel; 29. ​​Flat key; 30. Plunger; 31. Cylinder chamber; 32. Key 2; 33. T-slot; 34. Base 2; 35. Bolt. DETAILED DESCRIPTION

[0028] 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.

[0029] According to the following Figure 5-Figure 8 The invention describes a four-pump-head plunger metering pump provided in an embodiment of the utility model.

[0030] The utility model discloses a four-pump-head plunger metering pump, which comprises a base 24, a driving mechanism, a transmission shaft 23, a crank-connecting rod mechanism, a stroke adjustment mechanism and a hydraulic end mechanism 2. The driving mechanism is used to drive the transmission shaft 23 to rotate, the crank-connecting rod mechanism is used to convert the rotational force of the transmission shaft 23 into the reciprocating force required for the reciprocating work of the hydraulic end mechanism 2, and the stroke adjustment mechanism is used to adjust the pumping volume of the hydraulic end mechanism 2.

[0031] 1. Driving mechanism:

[0032] The driving mechanism is composed of a motor 2 1 and a first-stage worm gear reduction structure. The first-stage worm gear reduction mechanism is composed of a motor bracket 2, a transmission box 4, a worm 5, a worm bearing 20, a worm wheel 28, a flat key 29, a worm wheel shaft 25, and a rolling bearing seat 26.

[0033] The worm gear shaft 25 is a straight shaft with a cavity. The transmission shaft 23 is a stepped shaft installed in the cavity of the worm gear shaft 25, and cooperates with the worm gear shaft 25 and is connected by a key 2 32, so that the worm gear shaft 25 and the transmission shaft 23 rotate synchronously. The worm wheel 28 is fixed to the periphery of the transmission shaft 23. The worm 5 is arranged on the upper part of the worm wheel 28 in a horizontal arrangement. One end of the worm 5 extends out of the transmission box 4. The axial center part of the end of the worm 5 extending out of the transmission box 4 has an axial worm hole 3, and a key groove is provided in the worm hole 3. The motor 2 1 is located The worm 5 is away from the end of the hydraulic end mechanism, and the shaft head of the motor 21 is inserted into the worm hole 3 of the worm 5. The torque is transmitted through the key. The motor 21 is fixed to the motor bracket 2 with bolts. The motor bracket 2 is fixed to the transmission box 4 with bolts. The rotation of the motor 21 drives the worm 5 to rotate through the key. The worm 5 is meshed with the worm wheel 28, driving the worm wheel 28 to rotate and decelerate the worm wheel 28. The two ends of the worm wheel shaft 25 are supported on the rolling bearing seat 26, and the rolling bearing seat 26 is installed on the transmission box 4 with bolts. The rotation of the worm wheel 28 drives the worm wheel shaft 25 to rotate through the flat key 29.

[0034] Preferably, the transmission box 4 is fixed on the base 2 34 .

[0035] 2. Crank-connecting rod mechanism:

[0036] The crank-connecting rod mechanism comprises two eccentric wheels 8 , two eccentric shafts 21 , four connecting rods 6 , four cross heads 12 , and four cross head pins 9 .

[0037] The eccentric wheel 8 is installed at both ends of the transmission shaft 23, the inner hole of the eccentric wheel 8 is matched with the transmission shaft 23, the end of the eccentric shaft 21 is threaded, the end face of the eccentric wheel 8 is threaded, and the threaded ends of the two eccentric shafts 21 are respectively screwed into the corresponding threaded holes of the end faces of the eccentric wheel 8. Four connecting rods 6 are distributed on the two eccentric wheels 8, that is, one eccentric wheel 8 has two groups of connecting rods 6, and the two groups of connecting rods 6 are symmetrical along the center of the transmission shaft 23. One end (big end) of the connecting rod 6 is sleeved on the corresponding eccentric shaft 21, and the connecting rod 6 can rotate on the eccentric shaft 21. The two connecting rods 6 on the same eccentric wheel 8 are distributed on both sides of the eccentric shaft 21.

[0038] Preferably, a retaining ring 22 for separating the two connecting rods 6 is provided on the eccentric shaft 21 .

[0039] A crosshead 12 is provided at the other end (small end) of the connecting rod 6, and a crosshead pin 9 is provided in the pin hole of the crosshead 12. The small end of the connecting rod is mounted on the crosshead pin 9, and the pin hole on the small end is hinged with the crosshead pin 9. The distance between the center of the eccentric shaft 21 and the center of the transmission shaft 23 is both the crank radius of the crank-connecting rod mechanism and half of the reciprocating motion stroke of the crosshead 12; a crosshead bushing 10 is also provided, and the crosshead bushing 10 is sleeved on the outside of the crosshead 12 for guiding the crosshead 12 in the axial direction, thereby limiting the crosshead 12 to only be able to reciprocate in the axial direction.

[0040] Preferably, sealing rings 11 are provided in the areas where the two ends of the crosshead bushing 10 contact the crosshead 12 .

[0041] Preferably, a machine base 19 is further provided, and the crosshead bushing 10 is fixed in a hole of the machine base 19 by bolts.

[0042] In this embodiment, when the transmission shaft 23 rotates with the worm shaft 25, the eccentric wheel 8 is also driven to rotate together. The rotation of the eccentric wheel 8 drives the eccentric shaft 21 on it to rotate around the axis of the transmission shaft 23. The diameter of the circle formed by the eccentric shaft 21 rotating around the axis of the transmission shaft 23 is the stroke of the reciprocating motion of the crosshead 12 of the pump. While the large end of the connecting rod 6 moves in a circle with the eccentric shaft 21, the small end of the connecting rod 6 drives the crosshead 12 to move together through the crosshead pin 9. Because the crosshead 12 is installed in the crosshead bushing 10, the crosshead 12 can only move along the axial direction. The eccentric shaft 21 moves around the center of the transmission shaft 23, and the crosshead 12 completes a reciprocating motion in the crosshead bushing 10. The maximum stroke of a reciprocating motion of the crosshead 12 is the maximum stroke of the plunger 30 of the pump.

[0043] 3. Hydraulic end mechanism 2:

[0044] The second hydraulic end mechanism includes a hydraulic end 14, which is located on the side of the crosshead 12 away from the connecting rod 6. The hydraulic end 14 has a cylinder cavity 31, and a plunger 30 is provided in the cylinder cavity 31. When the plunger 30 reciprocates along the cylinder cavity 31, the liquid can be sucked in and pumped out.

[0045] The plunger 30 reciprocates in the cylinder chamber 31. During the suction stroke, the plunger 30 sucks the medium to be transported into the cylinder chamber 31 through the suction valve. During the discharge stroke, the plunger 30 discharges the medium from the cylinder chamber 31 to the outside of the pump through the discharge valve, thereby completing the delivery of the transport medium by the hydraulic end of the pump.

[0046] Preferably, the hydraulic end mechanism 2 is installed in the hole of the machine base 19, coaxial with the crosshead 12. The four machine bases 19 are respectively fixed to the base 2 34 with bolts 35. The four machine bases 19 play a supporting role. One end of the machine base 19 supports the crosshead bushing 10 and the crosshead 12, and the other end supports the hydraulic end mechanism 2 of the pump. Each machine base 19 is provided with a liquid collecting tank 15, which is used to collect the leakage liquid generated by the reciprocating movement of the plunger 30 after sealing.

[0047] 4. Plunger stroke adjustment mechanism:

[0048] The plunger stroke adjustment mechanism is used to connect the crosshead 12 and the plunger 30, and can adjust the distance between the plunger 30 and the crosshead 12 to change the position of the plunger 30 in the cylinder chamber 31, thereby changing the output flow of the pump. The specific plunger 30 stroke adjustment mechanism is composed of a stroke adjustment screw 18, a stroke adjustment piston 17, a locking nut 13 and a scale 27.

[0049] The outer circumference of the stroke adjustment screw 18 is an external thread, and an internal threaded hole is provided in one end of the crosshead 12 close to the plunger 30. The external thread of the stroke adjustment screw 18 cooperates with the internal thread of the crosshead 12. By rotating the stroke adjustment screw 18, the distance between the end face of the threaded portion of the stroke adjustment screw 18 and the bottom end face of the internal thread of the crosshead 12 changes, thereby adjusting the relative position of the stroke adjustment screw 18 and the plunger 30. The stroke adjustment piston 17 is installed between the crosshead 12 and the stroke adjustment screw 18. The end of the stroke adjustment piston 17 has a boss, and the outer circle of the boss is larger than the inner hole of the stroke adjustment screw 18, which plays a limiting role to prevent the stroke adjustment piston 17 from detaching from the stroke adjustment screw 18; the other end of the stroke adjustment piston 17 has a T-slot 33, and the plunger 30 is provided with a T-block adapted to the T-slot 33, so that the two are embedded.

[0050] The stroke adjustment piston 17 can only move along the axial direction between the crosshead 12 and the stroke adjustment screw 18. By rotating the stroke adjustment screw 18 to adjust the relative distance between it and the crosshead 12, the position of the stroke adjustment piston 17 relative to the hydraulic end 14 can be changed, thereby changing the position of the pump plunger 30 relative to the cylinder chamber 31 and changing the output flow of the pump. The distance change of the stroke adjustment piston 17 is marked by the scale 27 on the machine base 19, which is used as a reference line for adjusting the length of the stroke adjustment piston 17.

[0051] In summary, the four-pump-head plunger metering pump uses a motor 21 to drive four pump heads. The flow rate and discharge pressure of each pump head can be different, and quantitative output of different media or the same medium at the same injection point or different injection points can be completed. The overall structure is compact, the reduction structure is arranged in the middle position of the pump, the transmission shaft 23 outputs at both ends, and the four hydraulic end mechanisms of the pump are arranged at the four corners of the base 234. Reduce the equipment space, easy operation and maintenance. After being put into use, the pump has achieved good economic benefits, and is mainly used in the oil extraction department as a chemical injection pump.

[0052] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0053] Although the 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 four-pump-head plunger metering pump, characterized in that: include: A transmission shaft (23), wherein both ends of the transmission shaft (23) are fixedly provided with eccentric wheels (8), an eccentric shaft (21) is eccentrically provided on one side of the eccentric wheel (8) away from the transmission shaft (23), and two groups of connecting rods (6) are rotatably provided on the single eccentric shaft (21), and the two groups of connecting rods (6) are distributed on both sides of the eccentric shaft (21); A crosshead (12), the crosshead (12) being arranged at an end of the connecting rod (6) away from the eccentric shaft (21), the end of the crosshead (12) close to the connecting rod (6) being hinged to the connecting rod (6) via a crosshead pin (9), and a crosshead bushing (10) being arranged on the outer periphery of the crosshead (12) for guiding the crosshead (12) in the axial direction and for limiting the crosshead (12) to reciprocate in the axial direction; A hydraulic end (14), the hydraulic end (14) being located on a side of the crosshead (12) away from the connecting rod (6), the hydraulic end (14) having a hydraulic cylinder cavity (31) therein, and a plunger (30) being provided in the hydraulic cylinder cavity (31); A plunger stroke adjustment mechanism, the plunger stroke adjustment mechanism being used to connect the crosshead (12) and the plunger (30) and being capable of adjusting the distance between the plunger (30) and the crosshead (12) so as to change the position of the plunger (30) in the cylinder cavity (31), thereby changing the output flow rate of the pump; A driving mechanism is connected to the transmission shaft (23) and is used to drive the transmission shaft (23) to rotate.

2. A four-pump-head plunger metering pump according to claim 1, characterized in that: The plunger stroke adjustment mechanism comprises: A stroke adjustment screw (18), wherein an internal threaded hole is provided in one end of the crosshead (12) close to the plunger (30), and one end of the stroke adjustment screw (18) is threadedly connected to the internal threaded hole; A stroke adjustment piston (17) is installed in a stroke adjustment screw (18). A boss is provided at one end of the stroke adjustment piston (17) close to the crosshead pin (9). The outer circle of the boss is larger than the inner hole of the stroke adjustment screw (18) to play a limiting role. The other end of the stroke adjustment piston (17) is fixedly connected to the plunger (30). By adjusting the position of the stroke adjustment screw (18) in the internal threaded hole, the distance between the stroke adjustment piston (17) and the crosshead (12) can be adjusted to change the position of the plunger (30) in the cylinder cavity (31).

3. A four-pump-head plunger metering pump according to claim 2, characterized in that: It also includes a machine base (19), the hydraulic end (14) is mounted on the machine base (19) and is coaxial with the crosshead (12); One end of the machine base (19) is used to support the crosshead bushing (10) and the crosshead (12), and the other end of the machine base (19) supports the hydraulic end (14). A liquid collecting tank (15) is provided on the machine base (19) for collecting leaked liquid when the plunger (30) reciprocates.

4. A four-pump-head plunger metering pump according to claim 3, characterized in that: A scale (27) is provided on the upper surface of the machine base (19) for serving as a reference line for adjusting the length of the stroke adjustment piston (17).

5. A four-pump-head plunger metering pump according to any one of claims 1 to 4, characterized in that: The driving mechanism comprises: A worm gear shaft (25), wherein the worm gear shaft (25) is a straight cylindrical shaft having a cavity, and the transmission shaft (23) is located inside the worm gear shaft (25) and rotates synchronously with the worm gear shaft (25); A worm wheel (28), wherein the worm wheel (28) is fixedly arranged on the periphery of the worm wheel shaft (25), and a worm (5) is meshed on one side of the worm wheel (28); Motor 2 (1), wherein the motor 2 (1) is arranged at an end of the worm (5) away from the hydraulic end (14), and is used to drive the worm (5) to rotate.

6. A four-pump-head plunger metering pump according to claim 5, characterized in that: The worm wheel (28) is fixedly connected to the worm wheel shaft (25) via a flat key (29), so that the worm wheel (28) and the worm wheel shaft (25) rotate synchronously.

7. A four-pump-head plunger metering pump according to claim 5, characterized in that: It also includes a second base (34), a transmission box (4) is provided outside the worm (5), and the transmission box (4) is fixed on the second base (34); The worm (5) is arranged horizontally, one end of the worm (5) extends out of the transmission box (4), an axial worm hole (3) is provided at the axial center of the end of the worm (5) extending out of the transmission box (4), a keyway is provided in the worm hole (3), the shaft head of the second motor (1) is inserted into the worm hole (3), and torque is transmitted through the key; The second motor (1) is fixed to the motor bracket (2) by means of bolts, and the motor bracket (2) and the transmission box (4) are fixedly connected by means of bolts; Both ends of the worm gear shaft (25) are supported on rolling bearing seats (26), and the rolling bearing seats (26) are mounted on the transmission box (4) by means of bolts.

8. A four-pump-head plunger metering pump according to claim 7, characterized in that: An end of the eccentric shaft (21) close to the eccentric wheel (8) is provided with an external thread, and an eccentric portion of the end surface of the eccentric wheel (8) is provided with a threaded hole, and the eccentric shaft (21) is fixed to the eccentric wheel (8) via the external thread and the threaded hole.

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