A device for detecting sulfuric acid content

Abstract

The present invention relates to the technical field of sulfuric acid content detection, and discloses a detection device for sulfuric acid content, comprising a first fixed plate, with second fixed plates fixedly installed on both left and right sides of the first fixed plate, a first motor fixedly installed on the left side of the first fixed plate, and an adjusting screw fixedly installed on the output end of the first motor, and a movable plate is arranged on the adjusting screw, and a receiving plate is fixedly installed on the upper end of the movable plate. The detection device for sulfuric acid content can drive the temperature sensing probe and the conductivity probe to move by rotating the adjusting screw and the rotating gear, thereby ensuring the accuracy of sulfuric acid content detection. When the temperature sensing probe and the conductivity probe move, the winding and releasing of the wire can avoid the wire from being too long and falling into the electrolyte without affecting the movement of the temperature sensing probe and the conductivity probe, and the electrolyte can be stirred by adding a stirring rod to avoid excessive precipitation of sulfuric acid.

Description

Technical Field

[0001] The invention relates to the technical field of sulfuric acid content detection, in particular to a device for detecting sulfuric acid content. Background Art

[0002] In the process of electroplating, electroplating solution is needed. Electroplating solution can expand the cathode current density range of metal, improve the appearance of the coating, and increase the anti-oxidation stability of the solution. Sulfuric acid, as a component of the electrolyte, can adjust the pH of the electrolyte. The ions in the sulfuric acid solution will move and generate current under the action of the electric field, and conductivity is a physical quantity that measures the current conduction ability. The higher the sulfuric acid concentration, the more ions there are in the solution, and the greater the conductivity. Therefore, the sulfuric acid content in the electroplating solution can be detected by the conductivity probe.

[0003] At present, the patent with publication number CN219320157U discloses a sulfuric acid content detection device, including an electroplating tank; a fixed shell is fixedly connected to the front end of the electroplating tank, and a monitoring mechanism is arranged inside the fixed shell; the monitoring mechanism includes a conductivity meter, the conductivity meter is electrically connected to a display device, the top of the conductivity meter is electrically connected to a temperature probe and a conductivity probe, the bottom ends of the temperature probe and the conductivity probe are inserted into the inside of the electroplating tank, the top of the fixed shell is provided with two groups of circular holes, the temperature probe and the conductivity probe both pass through the circular holes, the inner walls on the left and right sides of the fixed shell are fixedly connected with fixed plates, the fixed plates are in contact with the conductivity meter and the display device, and the conductivity meter and the display device are both arranged inside the fixed shell. The front end of the fixed shell is provided with a cabinet door, the cabinet door is provided with an observation window, and the front end of the cabinet door is fixedly connected with a protrusion. The left and right sides of the fixed shell are fixedly connected with fixed blocks, and the fixed blocks are threadedly connected with bolts. Through the structural design of the monitoring mechanism, the function of real-time monitoring of the sulfuric acid content in the electroplating tank is realized, which solves the problem that the traditional sulfuric acid content detection generally adopts the titration method, which can only detect the sulfuric acid content in a certain period of time and cannot perform real-time online monitoring of the sulfuric acid content in the electroplating copper solution; through the structural design of the slider, the function of fixing the temperature probe and the conductivity probe is realized, which solves the problem that the temperature probe and the conductivity probe are easy to shake inside the electroplating tank.

[0004] However, the following problems still exist during the use of the above-mentioned sulfuric acid content detection device: in the process of detecting sulfuric acid in the electroplating solution, the same position detection method is adopted. In actual situations, due to the influence of various factors, the sulfuric acid content in the solution may vary at different positions and depths. If there are larger particles or colloids in the sulfuric acid solution, they may settle in the solution due to gravity, resulting in a higher concentration at the bottom, thereby causing inaccurate measurements when measuring the sulfuric acid content. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a device for detecting sulfuric acid content, which detects the sulfuric acid content in the electrolyte in a mobile manner, thereby ensuring the accuracy of the detection and avoiding high bottom concentration due to sedimentation.

[0006] The present invention provides the following technical scheme: a device for detecting sulfuric acid content, comprising a first fixed plate, on which second fixed plates are fixedly installed on both left and right sides, a first motor is fixedly installed on the left side of the first fixed plate, and an adjusting screw is fixedly installed on the output end of the first motor, and a movable plate is arranged on the adjusting screw, a receiving plate is fixedly installed on the upper end of the movable plate, and a supporting slider is slidably arranged on the receiving plate, and a placement box is fixedly installed on the supporting slider, a second motor is fixedly installed on the side of the placement box, and the output end of the second motor is connected to a rotating gear through a rotating shaft, a gear structure is arranged on the receiving plate, and the rotating gear is meshed with the receiving plate through the gear structure arranged on the receiving plate, an electric telescopic rod is fixedly installed in the middle position of the placement box, and a lifting plate is fixedly installed on the upper end of the electric telescopic rod, a temperature sensing probe and a conductivity probe are fixedly installed on the lower end of the lifting plate, and the temperature sensing probe and the conductivity probe are both powered by connecting wires.

[0007] Furthermore, the second fixing plate is connected with fixing screws through threaded holes, and the fixing screws are arranged through the mounting plate, and the mounting plate is fixedly mounted on the outer surface of the electroplating tank. Through the above structure, the second fixing plate and the mounting plate can be easily installed and fixed by fixing screws.

[0008] Furthermore, a pulley group is fixedly installed on the adjusting screw, and a bearing is fixedly installed on the first fixed plate, and the adjusting screw forms a rotating mechanism with the first fixed plate through the bearing installed on the first fixed plate, a penetrating threaded hole is opened in the middle position of the movable plate, and the adjusting screw forms a threaded connection with the movable plate through the threaded hole opened in the middle position of the movable plate. Through the above structure, it is convenient to support the adjusting screw without affecting the rotation of the adjusting screw, and the position of the movable plate can be changed as the adjusting screw rotates.

[0009] Furthermore, a limiting slide plate and a wire fixing plate are fixedly installed on the supporting plate, and a through hole is provided in the middle position of the limiting slide plate, and the connecting wire is slidably connected with the limiting slide plate through the through hole provided on the limiting slide plate, and the connecting wire is fixedly arranged on the wire fixing plate. Through the above structure, it is convenient to fix the connecting wire through the wire fixing plate, and to guide and limit the connecting wire through the limiting slide plate.

[0010] Furthermore, the connecting wire is attached to the pulling plate, and a connecting spring is fixedly installed on the pulling plate, an additional plate is fixedly installed on the supporting plate, and a connecting spring is fixedly installed on the additional plate, guide rods are symmetrically arranged on the pulling plate, and the guide rods and the additional plate form a sliding connection. Through the above structure, it is convenient to limit the moving range of the pulling plate through the guide rods to avoid the pulling plate from moving offset.

[0011] Furthermore, a winding plate is fixedly installed on the adjusting screw, and a long strip groove is opened on the winding plate, and a fixed sliding rod is fixedly installed in the long strip opened on the winding plate, and a movable slide is slidably arranged in the long strip opened on the winding plate, and a return spring is fixedly installed on the lower end of the movable slide, and the return spring is fixedly installed on the winding plate. Through the above structure, it is convenient to push the movable slide and the wire plate through the return spring to guide the unwinding and winding of the wire.

[0012] Furthermore, an extension plate is fixedly installed on the lower end of the first fixed plate, and a fixed winding plate is fixedly installed on the extension plate, and a connecting wire is fixedly wound on the fixed winding plate, the connecting wire and the wire plate are in contact with each other, and the wire plate is fixedly installed on the movable slide. Through the above structure, it is convenient to unwind and store the connecting wire by rotating the wire plate.

[0013] Furthermore, a lower fixed plate is fitted at the lower end of the receiving plate, and a stirring rod is fixed through the middle position of the lower fixed plate, and the stirring rod passes through and fits the upper fixed plate. The upper fixed plate and the lower fixed plate fit each other. Through the above structure, the electrolyte can be stirred by moving the stirring rod, thereby reducing the precipitation of sulfuric acid.

[0014] Furthermore, a positioning screw is provided through the lower fixed plate, and the positioning screw is threadedly connected to the lower fixed plate, a vertical plate is fixedly installed on the upper fixed plate, and a pull rod is provided through the vertical plate, and the pull rod and the stirring rod form a snap-fit ​​connection, a support spring is fixedly installed on the pull rod, and the support spring is fixedly installed on the vertical plate. Through the above structure, the stirring rod can be snap-fitted and fixed by the pull rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The device for detecting sulfuric acid content can drive the temperature sensing probe and the conductivity probe to move in multiple directions by adjusting the rotation of the screw and the rotating gear, so that different positions in the electrolyte can be measured, and the accuracy of sulfuric acid content detection can be ensured, so that the sulfuric acid content can be accurately controlled to ensure the electroplating effect. In addition, during the movement of the temperature sensing probe and the conductivity probe, the wire can be rolled up and released, so that the wire can be prevented from being entangled due to excessive length and falling into the electrolyte without affecting the movement of the temperature sensing probe and the conductivity probe, that is, the normal movement of the temperature sensing probe and the conductivity probe can be ensured. By adding a stirring rod, the electrolyte can be stirred and mixed, so that excessive precipitation of sulfuric acid can be avoided. In other words, the error of sulfuric acid content detection can be reduced by stirring the electrolyte before detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the first fixing plate of the present invention;

[0019] Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the fixing screw of the present invention;

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the adjusting screw of the present invention;

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the placement box of the present invention;

[0022] Figure 6 It is a schematic diagram of the three-dimensional cross-sectional structure of the conductivity probe of the present invention;

[0023] Figure 7 It is a schematic diagram of the three-dimensional cross-sectional structure of the support sliding block of the present invention;

[0024] Figure 8 It is a schematic diagram of the three-dimensional cross-sectional structure of the pull plate of the present invention;

[0025] Fig. 9 It is a schematic diagram of the three-dimensional cross-sectional structure of the fixed winding plate of the present invention;

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the conductor plate of the present invention;

[0027] Fig.11 It is a schematic diagram of the three-dimensional cross-sectional structure of the stirring rod of the present invention;

[0028] Fig.12 For the present invention Fig.11 Enlarged structural diagram at A in the middle.

[0029] In the figure: 1. first fixed plate; 2. second fixed plate; 3. fixing screw; 4. mounting plate; 5. first motor; 6. adjusting screw; 7. pulley group; 8. moving plate; 9. receiving plate; 10. supporting slide block; 11. placing box; 12. second motor; 13. rotating gear; 14. electric telescopic rod; 15. lifting plate; 16. temperature sensor probe; 17. conductivity probe; 18. connecting wire; 19. limiting slide plate; 20. pulling plate; 21. connecting spring; 22. additional plate; 23. guide rod; 24. winding plate; 25. fixed slide bar; 26. moving slide plate; 27. return spring; 28. wire plate; 29. ​​extension plate; 30. fixed winding plate; 31. lower fixed plate; 32. stirring rod; 33. upper fixed plate; 34. positioning screw; 35. vertical plate; 36. pulling rod; 37. supporting spring; 38. fixing wire plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] See also Figure 1-Figure 12 The present invention provides a technical solution: a detection device for sulfuric acid content, comprising a first fixed plate 1, a second fixed plate 2 is fixedly installed on both left and right sides of the first fixed plate 1, a fixing screw 3 is connected to the second fixed plate 2 through a threaded hole, and the fixing screw 3 is arranged on the mounting plate 4, and the mounting plate 4 is fixedly installed on the outer surface of the electroplating tank, a supporting slider 10 is slidably arranged on the receiving plate 9, and a placement box 11 is fixedly installed on the supporting slider 10, a second motor 12 is fixedly installed on the side of the placement box 11, and the output end of the second motor 12 is connected to a rotating gear 13 through a rotating shaft, a gear structure is arranged on the receiving plate 9, and the rotating gear 13 is meshed with the receiving plate 9 through the gear structure arranged on the receiving plate 9, an electric telescopic rod 14 is fixedly installed in the middle position of the placement box 11, and the upper end of the electric telescopic rod 14 is fixedly installed A lifting plate 15 is fixedly installed, and a temperature sensing probe 16 and a conductivity probe 17 are fixedly installed at the lower end of the lifting plate 15. The temperature sensing probe 16 and the conductivity probe 17 are powered by a connecting wire 18. A limiting slide plate 19 and a fixing plate 38 are fixedly installed on the receiving plate 9, and a through hole is opened in the middle position of the limiting slide plate 19, and the connecting wire 18 is slidably connected with the limiting slide plate 19 through the through hole opened on the limiting slide plate 19. The connecting wire 18 is fixedly set on the fixing plate 38, the connecting wire 18 is attached to the pulling plate 20, and a connecting spring 21 is fixedly installed on the pulling plate 20, an additional plate 22 is fixedly installed on the receiving plate 9, and a connecting spring 21 is fixedly installed on the additional plate 22, guide rods 23 are symmetrically arranged on the pulling plate 20, and the guide rods 23 and the additional plate 22 are slidably connected.

[0032] When the detection device needs to be installed, the first fixing plate 1 and the second fixing plate 2 are both fitted with the outer surface of the electroplating tank. Since a mounting plate 4 is provided outside the electroplating tank, the second fixing plate 2 begins to fit with the mounting plate 4, and the fixing screw 3 passes through the mounting plate 4. Then the fixing screw 3 is rotated to connect the fixing screw 3 with the threaded hole provided on the second fixing plate 2. Then the second motor 12 starts to work. Since the output end of the second motor 12 is connected with the rotating gear 13 through the rotating shaft, the rotating gear 13 begins to rotate. Since the rotating gear 13 is meshed with the receiving plate 9 through the gear structure provided on the receiving plate 9, as the rotating gear 13 rotates, the placement box 11 begins to move back and forth under the action of the supporting slider 10, thereby driving the temperature sensor probe 16 and the conductivity probe 17. It moves back and forth to detect different positions. At the same time, as the placement box 11 moves, the connecting wire 18 is no longer pulled by the lifting plate 15. Under the action of the connecting spring 21 restoring the deformation, the pulling plate 20 begins to move toward the direction close to the installation plate 22, and under the action of the guide rod 23, the moving range of the pulling plate 20 can be guaranteed to avoid the position displacement of the pulling plate 20 during the movement. At the same time, when it is necessary to detect electrolytes of different depths, the electric telescopic rod 14 starts to work, because the lifting plate 15 is fixedly installed on the upper end of the electric telescopic rod 14. At this time, the lifting plate 15 starts to move up and down. With the movement of the lifting plate 15, the use height of the temperature sensor probe 16 and the conductivity probe 17 can be adjusted, so that the sulfuric acid content of electrolytes of different depths can be detected.

[0033] A first motor 5 is fixedly installed on the left side of the first fixed plate 1, and an adjusting screw 6 is fixedly installed on the output end of the first motor 5, and a moving plate 8 is arranged on the adjusting screw 6, a receiving plate 9 is fixedly installed on the upper end of the moving plate 8, a pulley group 7 is fixedly installed on the adjusting screw 6, and a bearing is fixedly installed on the first fixed plate 1, and the adjusting screw 6 forms a rotating mechanism with the first fixed plate 1 through the bearing installed on the first fixed plate 1, a threaded hole is opened in the middle position of the moving plate 8, and the adjusting screw 6 is threadedly connected with the moving plate 8 through the threaded hole opened in the middle position of the moving plate 8, and a receiving plate 9 is fixedly installed on the adjusting screw 6. A winding plate 24 is provided, and a long strip groove is opened on the winding plate 24, and a fixed slide bar 25 is fixedly installed in the long strip opened on the winding plate 24, and a movable slide plate 26 is slidably arranged in the long strip opened on the winding plate 24, and a return spring 27 is fixedly installed at the lower end of the movable slide plate 26, and the return spring 27 is fixedly installed on the winding plate 24, an extension plate 29 is fixedly installed at the lower end of the first fixed plate 1, and a fixed winding plate 30 is fixedly installed on the extension plate 29, and a connecting wire 18 is fixedly wound on the fixed winding plate 30, the connecting wire 18 and the wire plate 28 are in contact with each other, and the wire plate 28 is fixedly installed on the movable slide plate 26.

[0034] When the detection position needs to be changed left or right, the first motor 5 starts to work, and the adjusting screw 6 and the pulley group 7 connected to each other at the output end of the first motor 5 start to rotate. Because the adjusting screw 6 is connected to the moving plate 8 through the threaded hole provided on the moving plate 8, the moving plate 8 starts to move. Because the receiving plate 9 is fixedly installed on the upper end of the moving plate 8, the receiving plate 9 starts to move, that is, the temperature sensing probe 16 and the conductivity probe 17 start to move to the right, so that the sulfuric acid content of the electrolyte at different positions can be detected. At the same time, with the rotation of the adjusting screw 6, the winding plate 24 fixedly installed on the adjusting screw 6 also starts to rotate, because the winding plate 24 is provided with a moving slide plate 26 and a wire plate 28, and the wire plate 28 is When the adjusting screw 6 drives the receiving plate 9 to move to the left, the winding plate 24 and the wire plate 28 start to rotate in the opposite direction, that is, when the wire plate 28 rotates one circle, the wire plate 28 is located outside the connecting wire 18. At this time, as the wire plate 28 rotates, the wire plate 28 can be wound up to avoid the wire plate 28 from being messy and falling into the electrolyte.

[0035] A lower fixed plate 31 is fitted on the lower end of the receiving plate 9, and a stirring rod 32 is fixed through the middle position of the lower fixed plate 31, and the stirring rod 32 passes through and fits on the upper fixed plate 33, the upper fixed plate 33 and the lower fixed plate 31 fit each other, a positioning screw 34 is passed through the lower fixed plate 31, and the positioning screw 34 is threadedly connected to the lower fixed plate 31, a vertical plate 35 is fixedly installed on the upper fixed plate 33, and a pulling rod 36 is passed through the vertical plate 35, and the pulling rod 36 forms a snap-fit ​​connection with the stirring rod 32, a supporting spring 37 is fixedly installed on the pulling rod 36, and the supporting spring 37 is fixedly installed on the vertical plate 35.

[0036] During the electroplating process of large components, the electroplating pool is usually large, so sulfuric acid is prone to precipitation. Therefore, before testing the sulfuric acid content, it is necessary to first install the stirring rod 32 so that the lower end of the lower fixed plate 31 and the lower end of the receiving plate 9 fit each other, and then the upper fixed plate 33 passes through the upper end of the stirring rod 32, and then pull the pulling rod 36 to make the pulling rod 36 start to move away from the vertical plate 35. Because the pulling rod 36 is fixedly installed with a supporting spring 37, the supporting spring 37 begins to be stretched and deformed at this time, and then the upper fixed plate 33 is pressed downward, and then the pulling rod 36 is released. Under the action of the supporting spring 37 restoring the deformation, the supporting spring 37 begins to pull the pulling rod 36 toward the vertical plate The stirring rod 32 is moved in the direction of 35 until the pulling rod 36 is engaged and fixed with the stirring rod 32. At this time, the stirring rod 32 can be installed. Then, the positioning screw 34 is rotated to connect the positioning screw 34 with the threaded hole opened on the lower fixing plate 31, so as to auxiliary fix the lower fixing plate 31 and ensure the stability of the stirring rod 32 when moving. Then, the first motor 5 drives the adjusting screw 6 to rotate, that is, the receiving plate 9 starts to move left and right. At this time, the stirring rod 32 also starts to move left and right, so that the electrolyte can be stirred to avoid the sulfuric acid from sinking to the bottom. When the stirring is completed, the lower fixing plate 31 is disassembled, and then the temperature sensor probe 16 and the conductivity probe 17 can be used to detect the sulfuric acid content.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting sulfuric acid content, comprising a first fixing plate (1), on both left and right sides of which second fixing plates (2) are fixedly mounted, characterized in that: Also includes: A first motor (5) is fixedly mounted on the left side of the first fixed plate (1), and an adjusting screw (6) is fixedly mounted on the output end of the first motor (5), and a movable plate (8) is arranged on the adjusting screw (6), a receiving plate (9) is fixedly mounted on the upper end of the movable plate (8), and a supporting slider (10) is slidably arranged on the receiving plate (9), and a placement box (11) is fixedly mounted on the supporting slider (10), a second motor (12) is fixedly mounted on the side of the placement box (11), and the output end of the second motor (12) is connected to a rotating gear (11) via a rotating shaft. 13) are connected to each other, a gear structure is provided on the receiving plate (9), and the rotating gear (13) is meshed with the receiving plate (9) through the gear structure provided on the receiving plate (9), an electric telescopic rod (14) is fixedly installed in the middle position of the placement box (11), and a lifting plate (15) is fixedly installed on the upper end of the electric telescopic rod (14), and a temperature sensor probe (16) and a conductivity probe (17) are fixedly installed on the lower end of the lifting plate (15), and the temperature sensor probe (16) and the conductivity probe (17) are both powered by a connecting wire (18); The receiving plate (9) is fixedly mounted with a limit slide plate (19) and a wire fixing plate (38), and a through hole is provided in the middle of the limit slide plate (19), and the connecting wire (18) is slidably connected to the limit slide plate (19) through the through hole provided on the limit slide plate (19), and the connecting wire (18) is fixedly provided on the wire fixing plate (38); The connecting wire (18) is attached to the pulling plate (20), and a connecting spring (21) is fixedly mounted on the pulling plate (20); an additional plate (22) is fixedly mounted on the receiving plate (9), and a connecting spring (21) is fixedly mounted on the additional plate (22); guide rods (23) are symmetrically arranged on the pulling plate (20), and the guide rods (23) and the additional plate (22) are slidably connected; A winding plate (24) is fixedly mounted on the adjusting screw rod (6), and a long strip groove is provided on the winding plate (24), and a fixed slide rod (25) is fixedly mounted inside the long strip groove provided on the winding plate (24), and a movable slide plate (26) is slidably provided inside the long strip groove provided on the winding plate (24), and a return spring (27) is fixedly mounted on the lower end of the movable slide plate (26), and the return spring (27) is fixedly mounted on the winding plate (24); An extension plate (29) is fixedly mounted on the lower end of the first fixed plate (1), a fixed winding plate (30) is fixedly mounted on the extension plate (29), a connecting wire (18) is fixedly wound on the fixed winding plate (30), the connecting wire (18) and the wire plate (28) are in contact with each other, and the wire plate (28) is fixedly mounted on the movable slide plate (26); A lower fixing plate (31) is fitted on the lower end of the receiving plate (9), and a stirring rod (32) is fixed through the middle of the lower fixing plate (31), and the stirring rod (32) passes through and fits on the upper fixing plate (33), and the upper fixing plate (33) and the lower fixing plate (31) fit on each other.

2. A detection device for sulfuric acid content according to claim 1, characterized in that: The second fixing plate (2) is connected to a fixing screw (3) via a threaded hole, and the fixing screw (3) is arranged through the mounting plate (4), and the mounting plate (4) is fixedly mounted on the outer surface of the electroplating tank.

3. A detection device for sulfuric acid content according to claim 1, characterized in that: A pulley group (7) is fixedly mounted on the adjusting screw (6), and a bearing is fixedly mounted on the first fixed plate (1), and the adjusting screw (6) forms a rotating mechanism with the first fixed plate (1) through the bearing mounted on the first fixed plate (1), a threaded hole is provided in the middle of the movable plate (8), and the adjusting screw (6) forms a threaded connection with the movable plate (8) through the threaded hole provided in the middle of the movable plate (8).

4. A detection device for sulfuric acid content according to claim 1, characterized in that: A positioning screw (34) is provided through the lower fixing plate (31), and the positioning screw (34) is threadedly connected to the lower fixing plate (31); a vertical plate (35) is fixedly mounted on the upper fixing plate (33), and a pulling rod (36) is provided through the vertical plate (35), and the pulling rod (36) is snap-fitted with the stirring rod (32); a supporting spring (37) is fixedly mounted on the pulling rod (36), and the supporting spring (37) is fixedly mounted on the vertical plate (35).

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