Precise closed-loop potting material proportioning device based on electronic balance

Abstract

The utility model discloses a precise closed-loop potting material proportioning device based on an electronic balance, which comprises a rack, a plunger metering mechanism and a lifting driving mechanism are respectively arranged on the rack, and a limit calibration mechanism is arranged above the plunger metering mechanism and is arranged on the lifting driving mechanism. The key component is a needle valve part in the plunger pump, and the needle valve comprises a needle valve sealing seat, a needle valve head and a sealing sheet fixedly connected with the needle valve head. During feeding and discharging, opening and closing of the needle valve are achieved through driving of the air cylinder, the sealing piece is used for achieving closing and opening of the feeding channel in different states, closing and opening of the feeding channel by the sealing piece are synchronous with opening and closing of the discharging channel by the needle valve head, and therefore accurate metering of feeding and discharging is guaranteed. According to the utility model, the problems of low potting efficiency and low potting precision existing in the existing potting batching mode are solved.

Description

Precision closed-loop potting compound mixing device based on electronic balance Technical Field

[0001] This utility model belongs to the field of electromechanical technology of automatic filling equipment, and relates to a precise closed-loop filling material proportioning device based on an electronic balance. Background Technology

[0002] In the electronics industry, epoxy potting is a common method for protecting electronic devices. Most potting processes involve mixing multiple components, and the component ratios are crucial; incorrect ratios can severely impact product quality. Currently, many potting methods rely on manual mixing, measured with an electronic balance before mixing. While this method ensures accurate proportions, it significantly reduces efficiency. Other methods use gear pumps to maintain component ratios, but research has shown that the unstable flow rate of gear pumps leads to low mixing accuracy. Currently, epoxy potting is used in many industries. The above mixing methods are unsuitable for high-precision mixing requirements, especially in aerospace and military industries where precise component ratios are critical. Therefore, to improve the mixing accuracy of potting compounds, a precise closed-loop potting compound mixing device needs to be designed. Summary of the Invention

[0003] The purpose of this invention is to provide a precise closed-loop potting compound mixing device based on an electronic balance, which solves the problems of low potting efficiency and low potting accuracy in existing potting compound mixing methods.

[0004] The technical solution adopted in this utility model is a precise closed-loop potting compound proportioning device based on an electronic balance, including a frame, on which a plunger metering mechanism and a lifting drive mechanism are respectively installed. A limit calibration mechanism is provided above the plunger metering mechanism and is installed on the lifting drive mechanism.

[0005] The features of this utility model also include:

[0006] The platform includes an upper support plate, a middle support plate, and a bottom plate arranged in parallel from top to bottom. Two columns pass through the two ends of the upper support plate, the middle support plate, and the bottom plate, respectively.

[0007] The plunger metering mechanism includes a plunger metering proportional pump body, inside which is fitted a piston cylinder, and inside the piston cylinder is a piston. A needle valve rod is coaxially sleeved inside the piston. The upper end of the needle valve rod is connected to a needle valve cylinder, and the lower end of the needle valve rod is provided with a conical needle valve head. Below the plunger metering proportional pump body is a needle valve seat, inside which is a needle valve sealing seat that mates with the needle valve head. Below the needle valve seat is a hollow feed nozzle, and below the feed nozzle is a container placed on an electronic balance. The side of the needle valve seat is connected to the needle valve seat inlet.

[0008] The plunger metering proportional pump body is fixed to the support plate in the frame by the pump body retaining block. The pump body retaining block is equipped with a reset limit switch seat, and the reset limit switch seat is equipped with a reset limit switch.

[0009] The needle valve seat also has a valve seat material cavity inside, and a sealing plate is fixed on the needle valve head, which is embedded inside the valve seat material cavity.

[0010] The limit calibration mechanism includes a limit block, a limit switch on the bottom side of the limit block, a needle valve rod passing through the limit block, and a linear bearing at the connection between the needle valve rod and the limit block; the limit block is also fixedly connected to the lower end of the guide rod, the guide rod passes through a guide rod slide mounted on a support plate on the platform, a grating ruler reading head seat is mounted on the top of the guide rod, a grating ruler reading head is mounted on the grating ruler reading head seat, and the grating ruler reading head is set directly opposite the grating ruler.

[0011] The grating ruler is vertically mounted on the support plate of the stand.

[0012] The lifting drive mechanism includes a lead screw arranged in a vertical direction. The upper end of the lead screw is connected to a servo motor through a coupling. The lead screw and a lead screw nut are engaged, and the lead screw nut is installed on a limit block.

[0013] The beneficial effects of this invention are as follows: It proposes using an electronic balance to calibrate the weight of components pumped out by a plunger metering proportional pump. A servo motor controls the amount of component drawn into the plunger proportional pump piston, which is determined by the piston's rising height. This height can be precisely measured using a linear encoder, thus establishing a calibration formula between component weight and piston rising height. This formula allows for the calculation of the piston rising height corresponding to the desired component weight. Therefore, by determining the piston rising height using a servo motor and linear encoder in actual operation, accurate component measurement can be guaranteed. By accurately measuring the weight of multiple components pumped out by multiple plunger metering proportional pumps, high-precision mixing ratios can be ensured. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the structure of the precise closed-loop potting compound proportioning device based on electronic balance of this utility model;

[0015] Figure 2 shows the feeding state of the plunger metering proportional pump in the precise closed-loop potting compound proportioning device based on electronic balance of this utility model.

[0016] Figure 3 shows the feeding state of the plunger metering proportional pump in the precise closed-loop potting compound proportioning device based on electronic balance of this utility model.

[0017] In the diagram, 1. Electronic balance, 2. Container, 3. Feed nozzle, 4. Needle valve seat feed inlet, 5. Needle valve seat, 6. Plunger metering proportional pump body, 7. Support plate in the frame, 8. Column, 9. Pump body retaining block, 10. Reset limit switch seat, 11. Reset limit switch, 12. Upper support plate of the frame, 13. Linear bearing, 14. Needle valve rod, 15. Needle valve cylinder, 16. Coupling, 17. Servo motor. 18. Grating ruler, 19. Grating ruler reading head, 20. Grating ruler reading head seat, 21. Guide light bar, 22. Guide light bar slide, 23. Nut, 24. Limit block, 25. Limit switch, 26. Limit plate, 27. Lead screw, 28. Piston cylinder, 29. Stand base plate, 30. Needle valve seat, 31. Needle valve head, 32. Filling component material, 33. Piston, 34. Valve seat material cavity, 35. Sealing plate. Detailed Implementation

[0018] The following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0019] This utility model is a precise closed-loop potting compound proportioning device based on an electronic balance, as shown in Figure 1. It includes a frame consisting of a column 8, a support plate 7 in the middle of the frame, a base plate 29 of the frame, and an upper support plate 12 of the frame, as well as a plunger metering proportioning pump body 6 installed on the frame.

[0020] As shown in Figure 2, the plunger metering proportional pump body 6 includes a piston 33, a needle valve rod 14, and a piston cylinder 28. The upper end of the needle valve rod 14 is connected to a needle valve cylinder 15, which is mounted on a support plate 12 on a frame. The plunger metering proportional pump body 6 is fixed to the support plate 7 on the frame by a pump body retaining block 9. A needle valve seat 5 is connected below the plunger metering proportional pump body 6. The needle valve seat 5 contains a needle valve sealing seat 30 that controls the opening and closing of the needle valve. The opening and closing of the feeding can be achieved through the cooperation of the needle valve head 31 and the needle valve sealing seat 30. A feeding nozzle 3 with a central perforation is connected below the needle valve seat 5. A container 2 receives the material below the feeding nozzle 3 and is weighed on an electronic balance 1. A needle valve seat inlet 4 is connected to the side of the needle valve seat 5. The filling component material 32 is fed through this needle valve seat inlet 4.

[0021] As a key driver for precise measurement, the servo motor 17 is mounted on the support plate 12 of the test bench. The shaft end of the servo motor 17 is fixedly connected to the lead screw 27 via a coupling 16. The lead screw nut 23, which mates with the lead screw 27, is mounted on a limit block 24. A limit switch 25 is installed on the limit block 24. The limit block 24 is also fixedly connected to the lower end of the guide rod 21. The guide rod 21 passes through the guide rod slide 22 mounted on the support plate 12 of the test bench. A grating ruler reading head seat 20 is mounted at the top of the guide rod 21, and the grating ruler reading head 19 is mounted on the grating ruler reading head seat 20. The grating ruler reading head 19 faces the grating ruler 18, which is vertically mounted on the support plate 12 of the test bench. In this way, when the guide rod 21 moves up and down, the grating ruler reading head 19 can accurately read the number of gratings that it passes through on the grating ruler 18 during the movement. To ensure that the needle valve 14 with its slender rod does not experience rod instability, a linear bearing 13 that mates with the needle valve rod 14 is installed on the limit block 24. This ensures that the needle valve rod 14 does not experience rod instability when subjected to the pressure from the needle valve cylinder 15 when the needle valve is closed.

[0022] As shown in Figure 3, the needle valve head 31 of the needle valve rod 14 is conical, and the needle valve seat 30 below it is an inner conical shape with a hole at the bottom. The needle valve seat 5 also has a valve seat material cavity 34 inside. A sealing plate 35 is fixed on the needle valve head 31. The sealing plate 35 extends into the valve seat material cavity 34. When the needle valve cylinder 15 pulls the needle valve rod 14 upward, the sealing plate 35 will block the filling component material 32 entering through the needle valve seat inlet 4.

[0023] The key to improving the accuracy of the proportioning is to calibrate the component material 32 that the piston 33 in the plunger metering proportional pump 6 can output at different rising positions, thereby ensuring the accuracy of the metering. The calibration method is as follows:

[0024] First, the feeding positions are set to 10mm, 20mm, 30mm, and 40mm. This is mainly to consider the non-linear relationship between the feeding position and the weight of the output potting component material 32, which is generally linear. First, at the set feeding position of 10mm, the servo motor 17 is controlled to rotate forward. The servo motor 17 drives the lead screw 27 to rotate via the coupling 16. The lead screw 27 engages with the lead screw nut 23. Since the lead screw nut 23 is connected to the limit block 24, and the limit block 24 cooperates with the guide rod slide 22 via the guide rod 21, the rotational movement of the lead screw nut 23 is restricted, and it can only rise together with the limit block 24. During the rising process, the grating ruler reading head 19 reads the grating at the upper end of the grating ruler 18 to obtain the accurate rising dimension. After reaching the required 10mm, the movement is accurately positioned and stops.

[0025] At this time, the control needle valve cylinder 15 extends its shaft, driving the needle valve rod 14 downward. The downward movement of the needle valve head 31 engages with the needle valve seat 30, closing the feeding channel (see Figure 2). Simultaneously, the downward movement of the sealing plate 35 opens the feeding channel. The filling component material 32 enters the valve seat material chamber 34 through the needle valve seat inlet 4 and then enters the plunger metering proportional pump body 6, pushing the piston 33 upward. When the piston 33 moves upward, it also drives the piston cylinder 28 and the positioning plate 26 fixed thereto to move upward together. Since the piston 33 and the needle valve rod 14 are loosely fitted together (the joint between the piston 33 and the needle valve rod 14 is sealed by a sealing ring), the needle valve rod 14 remains stationary, maintaining the closed needle valve state. When the plate 26 moves upward and contacts the limit block 24, it can no longer move upward. At the same time, it contacts the limit switch 25. The control system receives a signal and knows that the potting component 32 has filled the corresponding position space of the plunger metering proportional pump body 6, and can then enter the feeding state.

[0026] The control system retracts the shaft of the needle valve cylinder 15, which in turn lifts the needle valve rod 14 upward. The needle valve head 31 also moves upward and disengages from the needle valve seat 30, while the upward-moving sealing plate 35 closes the feed channel. At this time, the discharge channel opens, and the control servo motor 17 reverses. Under the engagement of the lead screw and nut, the limit block 24 moves downward, pressing the positioning plate 26 downward, which in turn drives the piston cylinder 28 and piston 33 downward together. The downward-moving piston 33 presses down the filling component material 32 that fills the pump body 6 of the plunger metering proportional pump. The filling component material 32 is then conveyed through the discharge nozzle 3 to the container 2 on the electronic balance 1. After the conveying is completed, that is, when the limit block 24 presses the positioning plate 26 to the initial position, the positioning plate will contact the reset limit switch 11 (the reset limit switch 11 is installed in the reset limit switch seat 10). At this time, the control system receives a signal that the material has been pressed to the correct position and all the material has been pressed out. The weight reading on the electronic balance 1 can then be read, thus recording the weight of the filling component material 32 corresponding to that lifting height. The position is adjusted sequentially to 20mm, 30mm, and 40mm, and the weight is measured sequentially to obtain the corresponding relationship, as shown in Table 1.

[0027] Table 1 Calibration Data

[0028]

[0029] Based on the data in Table 1, assuming a linear relationship between the rising position (0-10mm), 10-20mm, 20-30mm, and 30-40mm) and the weight of the output component material (segmented linearity is convenient for calculation and more accurate), the corresponding calibration formula can be obtained as follows:

[0030] y = 0.1ax 0 <= x < 10

[0031] y = 0.1(x - 10)(ba) + a10 <= x < 20

[0032] y = 0.1(x - 20)(cb) + b 20 <= x < 30

[0033] y = 0.1(x - 30)(dc) + c 30 <= x < 40

[0034] If the output needs to be greater than 40mm, the weight of the component material output after rising 50mm can also be measured using this method during calibration, and the formula can be calibrated.

[0035] During actual operation, the amount of rise can be calculated according to the calibrated formula, the rising position can be accurately positioned by the servo motor 17, and the accurate quantitative output of component material 32 can be achieved through corresponding operations. When accurately proportioning materials A and B, the plunger metering proportioning pumps for materials A and B are calibrated respectively, and the accurate quantitative input is performed according to the calibration formula to ensure high-precision proportioning effect.

[0036] Example 1

[0037] The precise closed-loop potting compound proportioning device based on electronic balance includes a frame on which a plunger metering mechanism and a lifting drive mechanism are installed. A limit calibration mechanism is provided above the plunger metering mechanism and is installed on the lifting drive mechanism.

[0038] Example 2

[0039] The precise closed-loop potting compound proportioning device based on electronic balance includes a frame on which a plunger metering mechanism and a lifting drive mechanism are installed. A limit calibration mechanism is provided above the plunger metering mechanism and is installed on the lifting drive mechanism.

[0040] The platform includes an upper support plate 12, a middle support plate 7, and a base plate 29 arranged in parallel from top to bottom. Two columns 8 pass through the two ends of the upper support plate 12, the middle support plate 7, and the base plate 29, respectively.

[0041] Example 3

[0042] The precise closed-loop potting compound proportioning device based on electronic balance includes a frame on which a plunger metering mechanism and a lifting drive mechanism are installed. A limit calibration mechanism is provided above the plunger metering mechanism and is installed on the lifting drive mechanism.

[0043] The platform includes an upper support plate 12, a middle support plate 7, and a base plate 29 arranged in parallel from top to bottom. Two columns 8 pass through the two ends of the upper support plate 12, the middle support plate 7, and the base plate 29, respectively.

[0044] The plunger metering mechanism includes a plunger metering proportional pump body 6, inside which is fitted a piston cylinder 28, and inside the piston cylinder 28 is a piston 33. A needle valve rod 14 is coaxially sleeved inside the piston 33. The upper end of the needle valve rod 14 is connected to a needle valve cylinder 15, and the lower end of the needle valve rod 14 is provided with a conical needle valve head 31. A needle valve seat 5 is connected below the plunger metering proportional pump body 6, and a needle valve sealing seat 30 is provided inside the needle valve seat 5. The needle valve sealing seat 30 cooperates with the needle valve head 31. A hollow feed nozzle 3 is connected below the needle valve seat 5, and a container 2 is provided below the feed nozzle 3. The container 2 is placed on an electronic balance 1. The side of the needle valve seat 5 is connected to a needle valve seat inlet 4.

[0045] Example 4

[0046] The precise closed-loop potting compound proportioning device based on electronic balance includes a frame on which a plunger metering mechanism and a lifting drive mechanism are installed. A limit calibration mechanism is provided above the plunger metering mechanism and is installed on the lifting drive mechanism.

[0047] The platform includes an upper support plate 12, a middle support plate 7, and a base plate 29 arranged in parallel from top to bottom. Two columns 8 pass through the two ends of the upper support plate 12, the middle support plate 7, and the base plate 29, respectively.

[0048] The plunger metering mechanism includes a plunger metering proportional pump body 6, inside which is fitted a piston cylinder 28, and inside the piston cylinder 28 is a piston 33. A needle valve rod 14 is coaxially sleeved inside the piston 33. The upper end of the needle valve rod 14 is connected to a needle valve cylinder 15, and the lower end of the needle valve rod 14 is provided with a conical needle valve head 31. A needle valve seat 5 is connected below the plunger metering proportional pump body 6, and a needle valve sealing seat 30 is provided inside the needle valve seat 5. The needle valve sealing seat 30 cooperates with the needle valve head 31. A hollow feed nozzle 3 is connected below the needle valve seat 5, and a container 2 is provided below the feed nozzle 3. The container 2 is placed on an electronic balance 1. The side of the needle valve seat 5 is connected to a needle valve seat inlet 4.

[0049] The plunger metering proportional pump body 6 is fixed on the support plate 7 in the frame by the pump body retaining block 9. The pump body retaining block 9 is provided with a reset limit switch seat 10, and the reset limit switch seat 10 is provided with a reset limit switch 11.

[0050] Example 5

[0051] The precise closed-loop potting compound proportioning device based on electronic balance includes a frame on which a plunger metering mechanism and a lifting drive mechanism are installed. A limit calibration mechanism is provided above the plunger metering mechanism and is installed on the lifting drive mechanism.

[0052] The platform includes an upper support plate 12, a middle support plate 7, and a base plate 29 arranged in parallel from top to bottom. Two columns 8 pass through the two ends of the upper support plate 12, the middle support plate 7, and the base plate 29, respectively.

[0053] The plunger metering mechanism includes a plunger metering proportional pump body 6, inside which is fitted a piston cylinder 28, and inside the piston cylinder 28 is a piston 33. A needle valve rod 14 is coaxially sleeved inside the piston 33. The upper end of the needle valve rod 14 is connected to a needle valve cylinder 15, and the lower end of the needle valve rod 14 is provided with a conical needle valve head 31. A needle valve seat 5 is connected below the plunger metering proportional pump body 6, and a needle valve sealing seat 30 is provided inside the needle valve seat 5. The needle valve sealing seat 30 cooperates with the needle valve head 31. A hollow feed nozzle 3 is connected below the needle valve seat 5, and a container 2 is provided below the feed nozzle 3. The container 2 is placed on an electronic balance 1. The side of the needle valve seat 5 is connected to a needle valve seat inlet 4.

[0054] The plunger metering proportional pump body 6 is fixed to the support plate 7 in the frame by the pump body retaining block 9. The pump body retaining block 9 is provided with a reset limit switch seat 10, and the reset limit switch seat 10 is provided with a reset limit switch 11. The needle valve seat 5 also has a valve seat material cavity 34 inside. A sealing plate 35 is fixed on the needle valve head 31 and is embedded in the valve seat material cavity 34.

[0055] Example 6

[0056] The precise closed-loop potting compound proportioning device based on electronic balance includes a frame on which a plunger metering mechanism and a lifting drive mechanism are installed. A limit calibration mechanism is provided above the plunger metering mechanism and is installed on the lifting drive mechanism.

[0057] The platform includes an upper support plate 12, a middle support plate 7, and a base plate 29 arranged in parallel from top to bottom. Two columns 8 pass through the two ends of the upper support plate 12, the middle support plate 7, and the base plate 29, respectively.

[0058] The plunger metering mechanism includes a plunger metering proportional pump body 6, inside which is fitted a piston cylinder 28, and inside the piston cylinder 28 is a piston 33. A needle valve rod 14 is coaxially sleeved inside the piston 33. The upper end of the needle valve rod 14 is connected to a needle valve cylinder 15, and the lower end of the needle valve rod 14 is provided with a conical needle valve head 31. A needle valve seat 5 is connected below the plunger metering proportional pump body 6, and a needle valve sealing seat 30 is provided inside the needle valve seat 5. The needle valve sealing seat 30 cooperates with the needle valve head 31. A hollow feed nozzle 3 is connected below the needle valve seat 5, and a container 2 is provided below the feed nozzle 3. The container 2 is placed on an electronic balance 1. The side of the needle valve seat 5 is connected to a needle valve seat inlet 4.

[0059] The plunger metering proportional pump body 6 is fixed to the support plate 7 in the frame by the pump body retaining block 9. The pump body retaining block 9 is provided with a reset limit switch seat 10, and the reset limit switch seat 10 is provided with a reset limit switch 11. The needle valve seat 5 also has a valve seat material cavity 34 inside. A sealing plate 35 is fixed on the needle valve head 31 and is embedded in the valve seat material cavity 34.

[0060] The limit calibration mechanism includes a limit block 24, with a limit switch 25 on the bottom side of the limit block 24. A needle valve rod 14 passes through the limit block 24, and a linear bearing 13 is provided at the connection between the needle valve rod 14 and the limit block 24. The limit block 24 is also fixedly connected to the lower end of the guide rod 21. The guide rod 21 passes through a guide rod slide 22 mounted on a support plate 12 on the platform. A grating ruler reading head seat 20 is mounted at the top of the guide rod 21, and a grating ruler reading head 19 is mounted on the grating ruler reading head seat 20, facing the grating ruler 18. The grating ruler 18 is vertically mounted on the support plate 12 on the platform.

[0061] Example 7

[0062] The precise closed-loop potting compound proportioning device based on electronic balance includes a frame on which a plunger metering mechanism and a lifting drive mechanism are installed. A limit calibration mechanism is provided above the plunger metering mechanism and is installed on the lifting drive mechanism.

[0063] The platform includes an upper support plate 12, a middle support plate 7, and a base plate 29 arranged in parallel from top to bottom. Two columns 8 pass through the two ends of the upper support plate 12, the middle support plate 7, and the base plate 29, respectively.

[0064] The plunger metering mechanism includes a plunger metering proportional pump body 6, inside which is fitted a piston cylinder 28, and inside the piston cylinder 28 is a piston 33. A needle valve rod 14 is coaxially sleeved inside the piston 33. The upper end of the needle valve rod 14 is connected to a needle valve cylinder 15, and the lower end of the needle valve rod 14 is provided with a conical needle valve head 31. A needle valve seat 5 is connected below the plunger metering proportional pump body 6, and a needle valve sealing seat 30 is provided inside the needle valve seat 5. The needle valve sealing seat 30 cooperates with the needle valve head 31. A hollow feed nozzle 3 is connected below the needle valve seat 5, and a container 2 is provided below the feed nozzle 3. The container 2 is placed on an electronic balance 1. The side of the needle valve seat 5 is connected to a needle valve seat inlet 4.

[0065] The plunger metering proportional pump body 6 is fixed to the support plate 7 in the frame by the pump body retaining block 9. The pump body retaining block 9 is provided with a reset limit switch seat 10, and the reset limit switch seat 10 is provided with a reset limit switch 11. The needle valve seat 5 also has a valve seat material cavity 34 inside. A sealing plate 35 is fixed on the needle valve head 31 and is embedded in the valve seat material cavity 34.

[0066] The limit calibration mechanism includes a limit block 24, a limit switch 25 is provided on the bottom side of the limit block 24, a needle valve rod 14 passes through the limit block 24, and a linear bearing 13 is provided at the connection between the needle valve rod 14 and the limit block 24; the limit block 24 is also fixedly connected to the lower end of the guide light rod 21, the guide light rod 21 passes through the guide light rod slide 22 installed on the support plate 12 on the platform, the top of the guide light rod 21 is equipped with a grating ruler reading head seat 20, the grating ruler reading head seat 20 is equipped with a grating ruler reading head 19, and the grating ruler reading head 19 is set directly opposite the grating ruler 18.

[0067] The lifting drive mechanism includes a lead screw 27 arranged in a vertical direction. The upper end of the lead screw 27 is connected to the servo motor 17 through a coupling 16. The lead screw 27 cooperates with the lead screw nut 23, which is mounted on the limit block 24.

Claims

1. A precise closed-loop potting compound proportioning device based on an electronic balance, characterized in that: The device includes a test stand, on which a plunger measuring mechanism and a lifting drive mechanism are installed respectively. A limit calibration mechanism is provided above the plunger measuring mechanism and is installed on the lifting drive mechanism. The limit calibration mechanism includes a limit block (24). A limit switch (25) is provided on the bottom side of the limit block (24). A needle valve rod (14) passes through the limit block (24), and a linear bearing (13) is provided at the connection between the needle valve rod (14) and the limit block (24). The limit block (24) is also fixedly connected to the lower end of the guide light rod (21). The guide light rod (21) passes through the guide light rod slide (22) installed on the support plate (12) on the test stand. A grating ruler reading head seat (20) is installed at the top of the guide light rod (21). A grating ruler reading head (19) is installed on the grating ruler reading head seat (20) and is positioned directly opposite the grating ruler (18).

2. The precise closed-loop potting compound proportioning device based on an electronic balance according to claim 1, characterized in that: The platform includes an upper support plate (12), a middle support plate (7), and a bottom plate (29) arranged in parallel from top to bottom. Two columns (8) pass through the two ends of the upper support plate (12), the middle support plate (7), and the bottom plate (29) respectively.

3. The precise closed-loop potting compound proportioning device based on an electronic balance according to claim 2, characterized in that: The plunger metering mechanism includes a plunger metering proportional pump body (6), a piston cylinder (28) is provided inside the plunger metering proportional pump body (6), a piston (33) is provided inside the piston cylinder (28), a needle valve rod (14) is coaxially sleeved inside the piston (33), a needle valve cylinder (15) is connected to the upper end of the needle valve rod (14), a conical needle valve head (31) is provided at the lower end of the needle valve rod (14), a needle valve seat (5) is connected below the plunger metering proportional pump body (6), a needle valve sealing seat (30) is provided inside the needle valve seat (5), and the needle valve sealing seat (30) cooperates with the needle valve head (31); a hollow feed nozzle (3) is connected below the needle valve seat (5), a container (2) is provided below the feed nozzle (3), the container (2) is placed on an electronic balance (1), and a needle valve seat inlet (4) is connected to the side of the needle valve seat (5).

4. The precise closed-loop potting compound proportioning device based on an electronic balance according to claim 3, characterized in that: The plunger metering proportional pump body (6) is fixed on the support plate (7) in the frame by the pump body retaining block (9). The pump body retaining block (9) is provided with a reset limit switch seat (10), and a reset limit switch (11) is provided on the reset limit switch seat (10).

5. The precise closed-loop potting compound proportioning device based on an electronic balance according to claim 3, characterized in that: The needle valve seat (5) also has a valve seat material cavity (34) inside, and a sealing plate (35) is fixed on the needle valve head (31), which is embedded inside the valve seat material cavity (34).

6. The precise closed-loop potting compound proportioning device based on an electronic balance according to claim 1, characterized in that: The grating ruler (18) is vertically mounted on the support plate (12) on the stand.

7. The precise closed-loop potting compound proportioning device based on an electronic balance according to claim 1, characterized in that: The lifting drive mechanism includes a lead screw (27) arranged in the vertical direction. The upper end of the lead screw (27) is connected to the servo motor (17) through a coupling (16). The lead screw (27) cooperates with the lead screw nut (23), and the lead screw nut (23) is installed on the limit block (24).

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