Chemical pump shaft connecting mechanism

Abstract

This invention provides a chemical pump shaft connection mechanism, including a frame and a motor and pump body mounted on the frame. A shaft is located on one side of the motor, and a wheel axle connected to an internal impeller is located on one side of the pump body. The shaft and wheel axle are connected via a shaft connection mechanism. The shaft connection mechanism includes a first shaft assembly connected to the shaft, a second shaft assembly connected to the wheel axle, and a buffer component sandwiched between the first and second shaft assemblies. The first shaft assembly includes a first sleeve and a first claw disc integrally formed with the first sleeve. The internal elastic element of the buffer teeth continuously pushes outwards against the metal pressure blocks on both sides, ensuring a seamless fit between the pressure blocks and the claw teeth. This adaptively compensates for the eccentricity of the two shafts, eliminating equipment malfunctions caused by eccentric operation. Furthermore, the buffer teeth, elastic element, and metal pressure blocks form a composite buffer structure that absorbs transmission vibrations and fluid pulse impacts, dispersing concentrated stress at the shaft connection point.

Description

Technical Field

[0001] This invention relates to the field of coupling technology, specifically to a chemical pump shaft connection mechanism. Background Technology

[0002] Chemical pumps are primarily used for conveying corrosive media such as acids and alkalis, high-temperature and high-viscosity chemical slurries, and flammable and explosive hydrocarbon media. The pump body structure is typically a two-section design, consisting of the motor drive shaft and the pump impeller shaft. Currently, the industry commonly uses rigid connection structures such as flat keys and flanges, as well as flexible couplings, which have the following drawbacks: 1. Machining and assembly errors and thermal deformation of the equipment base can easily cause misalignment between the drive shaft and the pump main shaft; the existing structure has no self-adaptive centering compensation structure, and the eccentric operation generates an extremely large radial impact force. Long-term operation can cause the pump shaft to bend, the bearing to seize, and the mechanical seal to deviate and leak. The leakage of chemical media can easily lead to safety accidents. 2. Rigid hard-connection structures cannot offset the pulsating vibration of the fluid in chemical pumps and the vibration of the motor drive; all stress is concentrated at the shaft joint section, and fatigue fracture occurs at the pump shaft joint under high load conditions; at the same time, vibration accelerates the damage of mechanical seals and causes excessive leakage.

[0003] Currently, flexible couplings with a plum blossom-shaped design are also used. However, the elastic buffer pad inside these couplings is made of soft materials such as rubber, which are easily worn. Long-term compression, impact, and uneven loading can cause wear, cracking, and breakage, making them consumables that need to be replaced periodically. Once the elastic pad is damaged, the claw teeth will directly and rigidly impact, easily damaging the claw teeth of the half-coupling, the pump shaft, and the motor bearings. Therefore, a chemical pump shaft connection mechanism with a compensating function is needed. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a chemical pump shaft connection mechanism with a compensation function, so as to solve the problems mentioned in the background art.

[0005] The technical problem solved by this invention is achieved by the following technical solution: a chemical pump shaft connection mechanism, including a frame and a motor and a pump body mounted on the frame. A shaft is provided on one side of the motor, and a wheel shaft connected to an impeller inside the pump body is provided on one side of the pump body. The shaft and the wheel shaft are connected by a shaft connection mechanism. The shaft connection mechanism includes a first shaft assembly connected to the shaft and a second shaft assembly connected to the wheel shaft, and a buffer member sandwiched between the first shaft assembly and the second shaft assembly. The first shaft assembly includes a first sleeve and a first claw disc integrally formed with the first sleeve. The second shaft assembly includes a second sleeve and a second claw disc integrally formed with the second sleeve. Claw teeth are alternately distributed on opposite sides of the first claw disc and the second claw disc. The buffer component includes a buffer sleeve and buffer teeth arranged in a ring at the outer end of the buffer sleeve. The buffer teeth are clamped between adjacent claw teeth, and pressure blocks that abut against the outer end face of the claw teeth are elastically provided on both sides of the buffer teeth. Locking components are provided on the first sleeve and the second sleeve respectively to prevent the first sleeve from disengaging from the machine shaft and to prevent the second sleeve from disengaging from the wheel shaft, thereby improving the stability of the equipment installation.

[0006] Specifically, the device connects to the machine shaft via a first shaft assembly and is secured to the machine shaft with a locking element to prevent the first shaft assembly from detaching. The second shaft assembly connects to the wheel axle and is also secured with a locking element to prevent detachment, thus improving the stability of the installation of both the first and second shaft assemblies. The first and second claw discs are interlocked by distributed claw teeth. A buffer element is clamped between adjacent claw teeth by buffer teeth and connected to the claw teeth by a pressure block elastically positioned at the outer end of the buffer teeth, avoiding the easy damage of traditional rubber pads.

[0007] As a further aspect of the present invention: The buffer tooth has a hollow cavity structure, with openings on both sides for the pressure blocks to pass through. Each pressure block is integrally formed with a side plate within the buffer tooth cavity, protruding around its perimeter to abut against the inner wall of the buffer tooth cavity, preventing the pressure block from detaching. The pressure blocks are made of metal, making them less prone to damage during friction with the claw teeth, thus improving stability. The pressure blocks are symmetrically arranged on both sides of the buffer tooth, and an elastic element is located between the two sets of pressure blocks within the buffer tooth. This elastic element pushes the pressure blocks on both sides outwards, abutting against the corresponding claw teeth, ensuring seamless connection between the buffer element and the claw teeth, improving transmission efficiency. Furthermore, the elastically arranged pressure blocks also provide some centering compensation for the connection between the first and second shaft assembly.

[0008] As a further aspect of the present invention: The elastic element is an elastic rubber block, with both sides of the elastic rubber block abutting against the side plate to push the pressure blocks on both sides to move outward.

[0009] As a further aspect of the present invention: One side of the buffer tooth has an open structure to facilitate the installation of the pressure block and elastic element inside the buffer tooth. The outer end of the buffer element is provided with a sealing plate for closing the opening of the buffer tooth. The sealing plate has a quincunx-shaped structure to correspond to the buffer teeth arranged in a ring at the outer end. The buffer sleeve and the buffer teeth have stepped grooves corresponding to the sealing plate. The sealing plate is embedded in the stepped grooves. A ring plate is fixedly provided in the middle of the sealing plate. The ring plate is inserted into the middle sleeve hole of the buffer sleeve. The outer end of the buffer sleeve has a first screw hole corresponding to the ring plate. The buffer sleeve and the ring plate are fixedly connected by a first screw, thereby fixing the sealing plate on the buffer sleeve. The first screw hole has a stepped structure. The first screw is installed inside the first screw hole to avoid contact between the first screw and the claw teeth at the outer end.

[0010] As a further aspect of the present invention: The first sleeve and the second sleeve are fitted with protective covers at their outer ends. The protective covers include a first cover and a second cover that are spliced ​​together. The first cover and the second cover are fixedly connected by bolts that are distributed in a certain manner, so as to fit over the outer ends of the first claw plate and the second claw plate. A first sealing ring is provided between the first cover and the first sleeve, a second sealing ring is provided between the second cover and the second sleeve, and a third sealing ring is provided between the first cover and the second cover to improve the sealing performance.

[0011] As a further aspect of the present invention: The machine shaft is provided with a number of keyways distributed in a ring. The first sleeve is provided with a flat key distributed in a ring in the corresponding keyways. The first sleeve is sleeved on the outer end of the machine shaft, and the flat key is embedded in the keyway so that the machine shaft and the first sleeve rotate synchronously.

[0012] As a further aspect of the present invention: The axle is also provided with a number of keyways in a ring, and the second sleeve is provided with a number of flat keys. The second sleeve is fitted on the outer end of the axle and installed in the keyway by the flat keys, so that the second sleeve rotates synchronously with the axle.

[0013] As a further aspect of the present invention: The locking component includes a rotating sleeve and a positioning pin that mates with the rotating sleeve. The positioning pin is distributed within the spring-loaded holes of the first sleeve and is elastically positioned within the spring-loaded holes. A positioning hole is provided on the machine shaft corresponding to the positioning pin. The rotating sleeve is installed on the outer end of the first sleeve, and an arc-shaped groove is provided inside the rotating sleeve. The outer end of the positioning pin is inserted into the groove. When the rotating sleeve is rotated, the arc-shaped surface within the groove gradually presses the positioning pin, moving it and inserting it into the positioning hole to lock the first sleeve and the machine shaft. The positioning pin's insertion into the groove prevents the rotating sleeve from disengaging.

[0014] As a further aspect of the present invention: The positioning pin is provided with a spring plate, and a return spring is provided in the spring-pressing hole to push the spring plate outward so that the positioning pin moves outward. The outer end of the spring-pressing hole is provided with a limiting sleeve to limit the spring plate. The spring-pressing hole is provided with an internal thread corresponding to the limiting sleeve, and the outer end of the limiting sleeve is provided with an external thread. The limiting sleeve is threadedly installed in the spring-pressing hole. The middle part of the limiting sleeve is provided with a guide hole so that the positioning pin can extend out of the limiting sleeve. The outer end of the limiting sleeve located at the guide hole is provided with an internal hexagonal hole to facilitate the installation and removal of the limiting sleeve. Personnel can press down the positioning pin through the internal hexagonal hole and insert it into the internal hexagonal hole to rotate and install or remove the limiting sleeve.

[0015] As a further aspect of the present invention: The mounting structure of the locking element on the second sleeve is the same as the mounting structure of the locking element on the first sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The internal elastic element of this mechanism continuously pushes the metal blocks on both sides outwards, ensuring a seamless fit between the blocks and the teeth. This adaptively offsets the eccentricity of the two shafts, providing self-eccentricity compensation and eliminating equipment malfunctions caused by eccentric operation. Furthermore, the composite buffer structure formed by the buffer teeth, elastic element, and metal blocks absorbs transmission vibrations and fluid pulse impacts, dispersing concentrated stress at the shaft connection point.

[0017] This mechanism is equipped with a split-type protective cover, with three sealing rings to fully seal the claw plate and buffer area; it prevents corrosive media and dust impurities from entering the transmission meshing area, prevents the claw teeth and buffer components from rusting and jamming, reduces the probability of corrosion failure, and ensures long-term stable operation.

[0018] Rotating the sleeve compresses the positioning pin into the positioning hole to lock it in place; rotating it in the opposite direction will release it during disassembly. The limiting sleeve has an internal hexagonal hole, which facilitates the individual disassembly and replacement of internal parts. The sleeve is fixed by a locking screw to prevent it from loosening. The connection is firm and supports quick disassembly and assembly, improving maintenance efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the shaft connection mechanism of the present invention; Figure 4 This is a schematic diagram of the buffer component mounting structure of the present invention; Figure 5 This is a schematic diagram of the buffer component mounting structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the buffer component of the present invention; Figure 7 This is a schematic diagram of the first shaft assembly structure of the present invention; Figure 8 This is a partial cross-sectional view of the locking component of the present invention; Figure 9 for Figure 8 Enlarged structural diagram at point A in the middle; The diagram identifies the following components: 1. Frame; 2. First shaft assembly; 3. Second shaft assembly; 4. Buffer component; 5. Locking component; 6. Protective cover; 11. Motor; 12. Pump body; 13. Shaft; 14. Wheel axle; 21. First sleeve; 22. First claw disc; 23. Claw teeth; 31. Second sleeve; 32. Second claw disc; 41. Buffer sleeve; 42. Buffer teeth; 43. Pressure block; 44. Side plate; 45. Elastic component; 46. Sealing plate; 47. Ring plate; 48. First screw; 51. Rotating sleeve; 52. Positioning pin; 53. Spring pressure hole; 54. Rotating groove; 55. Locking screw; 56. Spring plate; 57. Return spring; 58. Limit sleeve; 61. First cover; 62. Second cover; 63. First sealing ring; 64. Second sealing ring; 65. Third sealing ring. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0021] like Figures 1-4 As shown, this embodiment provides a chemical pump shaft connection mechanism, including a frame 1 and a motor 11 and a pump body 12 mounted on the frame 1. The motor 11 has a shaft 13 on one side, and the pump body 12 has a wheel shaft 14 connected to the impeller inside the pump body 12 on one side. The shaft 13 and the wheel shaft 14 are connected by a shaft connection mechanism. The shaft connection mechanism includes a first shaft assembly 2 connected to the shaft 13 and a second shaft assembly 3 connected to the wheel shaft 14, and a buffer 4 sandwiched between the first shaft assembly 2 and the second shaft assembly 3. The first shaft assembly 2 includes a first sleeve 21 and a first claw disk 22 integrally formed with the first sleeve 21. The second shaft assembly 3 includes a second sleeve 31 and a second claw disk 32 integrally formed with the second sleeve 31. Claw teeth 23 are alternately distributed on opposite sides of the first claw disk 22 and the second claw disk 32. The buffer component 4 includes a buffer sleeve 41 and buffer teeth 42 arranged in a ring on the outer end of the buffer sleeve 41. The buffer teeth 42 are sandwiched between adjacent claw teeth 23, and pressure blocks 43 are elastically provided on both sides of the buffer teeth 42 and abut against the outer end face of the claw teeth 23. Locking components 5 are respectively provided on the first sleeve 21 and the second sleeve 31 to prevent the first sleeve 21 from disengaging from the machine shaft 13 and to prevent the second sleeve 31 from disengaging from the wheel shaft 14, thereby improving the stability of the equipment installation.

[0022] Specifically, the device is connected to the machine shaft 13 via the first shaft assembly 2 and fixed to the machine shaft 13 via the locking member 5 to prevent the first shaft assembly 2 from detaching from the machine shaft 13. The second shaft assembly 3 is connected to the wheel axle 14 and is also prevented from detaching via the locking member 5, thus improving the stability of the installation of the first shaft assembly 2 and the second shaft assembly 3. The first claw plate 22 and the second claw plate 32 are interlocked by distributed claw teeth 23. The buffer member 4 is clamped between adjacent claw teeth 23 via buffer teeth 42 and is connected to the claw teeth 23 via a pressure block 43 elastically set at the outer end of the buffer teeth 42, avoiding the easy damage of traditional rubber pads.

[0023] The buffer pads in traditional plum blossom flexible couplings are made of rubber or polyurethane, which are easily damaged by friction. Furthermore, acid and alkali mists, solvents, and high temperatures in chemical production can accelerate the aging, powdering, swelling, and failure of rubber and polyurethane.

[0024] like Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment, the buffer tooth 42 has a hollow cavity structure, and the buffer tooth 42 has through holes for the pressure block 43 on both sides. The pressure block 43 is integrally provided with a side plate 44 in the inner cavity of the buffer tooth 42. The side plate 44 protrudes around the pressure block 43 so as to abut against the inner cavity wall of the buffer tooth 42 to prevent the pressure block 43 from detaching. The pressure block 43 is a metal structure, so that the pressure block 43 is not easily damaged when it rubs against the claw tooth 23, thus improving stability. The pressure blocks 43 are symmetrically arranged on both sides of the buffer tooth 42, and an elastic element 45 is provided in the buffer tooth 42 between the two sets of pressure blocks 43. The elastic element 45 pushes the pressure blocks 43 on both sides to move outward and abut against the corresponding claw tooth 23, so that the buffer element 4 and the claw tooth 23 are seamlessly connected, improving the transmission efficiency. The elastically arranged pressure block 43 can also play a certain role in centering compensation for the connection between the first shaft assembly 2 and the second shaft assembly 3.

[0025] The elastic element 45 is an elastic rubber block, with its two sides abutting against the side plate 44 to push the pressure blocks 43 on both sides to move outward.

[0026] The elastic element 45 is a spring, and the two sides of the spring are connected to the side plate 44 respectively to push the pressure blocks 43 on both sides to move outward.

[0027] In this embodiment, the buffer 4 contacts the claw tooth 23 through the metal pressure block 43. The elastic element 45 inside the buffer tooth 42 pushes the pressure blocks 43 on both sides to move outward, so that the pressure block 43 fits with the claw tooth 23, thereby improving the stability of the transmission.

[0028] One side of the buffer tooth 42 has an open structure to facilitate the installation of the pressure block 43 and the elastic element 45 inside the buffer tooth 42. The outer end of the buffer element 4 is provided with a sealing plate 46 for closing the opening of the buffer tooth 42. The sealing plate 46 has a plum blossom-shaped structure to correspond to the buffer teeth 42 arranged in a ring at the outer end. The buffer sleeve 41 and the buffer teeth 42 have stepped grooves corresponding to the sealing plate 46. The sealing plate 46 is embedded in the stepped groove. A ring plate 47 is fixedly provided in the middle of the sealing plate 46. The ring plate 47 is inserted into the middle sleeve hole of the buffer sleeve 41. The outer end of the buffer sleeve 41 has a first screw hole corresponding to the ring plate 47. The buffer sleeve 41 and the ring plate 47 are fixedly connected by a first screw 48, thereby fixing the sealing plate 46 on the buffer sleeve 41. The first screw hole has a stepped structure. The first screw 48 is installed inside the first screw hole to avoid the first screw 48 from contacting the claw teeth 23 at the outer end.

[0029] During use, impurities, acid or alkali mists, and solvents may enter the connection between the claw teeth 23 and the buffer component 4, affecting the connection and causing corrosion, jamming, accelerated wear, or even damage to the shaft connection mechanism. Therefore, a technical solution is needed to address these problems.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, a protective cover 6 is installed on the outer ends of the first sleeve 21 and the second sleeve 31. The protective cover 6 includes a first cover 61 and a second cover 62 that are spliced ​​together. The first cover 61 and the second cover 62 are fixedly connected by bolts that are distributed in a certain manner, so as to be fitted onto the outer ends of the first claw plate 22 and the second claw plate 32. A first sealing ring 63 is provided between the first cover 61 and the first sleeve 21, a second sealing ring 64 is provided between the second cover 62 and the second sleeve 31, and a third sealing ring 65 is provided between the first cover 61 and the second cover 62 to improve the sealing performance.

[0031] The machine shaft 13 is provided with a number of keyways distributed in a ring. The first sleeve 21 is provided with a flat key distributed in a ring corresponding to the keyways. The first sleeve 21 is sleeved on the outer end of the machine shaft 13, and the flat key is embedded in the keyway so that the machine shaft 13 and the first sleeve 21 rotate synchronously.

[0032] The axle 14 is also provided with a number of keyways in a ring, and the second sleeve 31 is provided with a number of flat keys. The second sleeve 31 is sleeved on the outer end of the axle 14 and is installed in the keyway by the flat keys, so that the second sleeve 31 rotates synchronously with the axle 14.

[0033] The traditional sleeve is connected to the machine shaft 13 by ordinary flat key and ordinary bolt, which is cumbersome to disassemble and assemble, time-consuming to maintain, and prone to loosening due to long-term vibration, causing the sleeve to slip and lose rotation.

[0034] like Figure 7 , Figure 8 and Figure 9 As shown, in this embodiment, the locking component 5 includes a rotating sleeve 51 and a positioning pin 52 that cooperates with the rotating sleeve 51. The positioning pin 52 is distributed within the spring-loaded holes 53 of the first sleeve 21 and is elastically disposed within the spring-loaded holes 53. The machine shaft 13 has a positioning hole corresponding to the positioning pin 52. The rotating sleeve 51 is installed on the outer end of the first sleeve 21, and the rotating sleeve 51 has an arc-shaped rotating groove 54. The outer end of the positioning pin 52 is inserted into the rotating groove 54. When the operator rotates the rotating sleeve 51, the arc-shaped surface within the rotating groove 54 gradually presses the positioning pin 52 to move, thereby inserting the positioning pin 52 into the positioning hole to lock the first sleeve 21 and the machine shaft 13. The positioning pin 52 is inserted into the rotating groove 54 to prevent the rotating sleeve 51 from disengaging.

[0035] To prevent the rotating sleeve 51 from rotating during the rotation of the first sleeve 21, a locking hole is provided on one side of the rotating sleeve 51, and it is fixedly installed in the corresponding position of the first sleeve 21 by a locking screw 55.

[0036] The positioning pin 52 is provided with a spring plate 56, and a return spring 57 is provided in the spring pressure hole 53 to push the spring plate 56 outward so that the positioning pin 52 moves outward. The outer end of the spring pressure hole 53 is provided with a limiting sleeve 58 to limit the spring plate 56. The spring pressure hole 53 is provided with an internal thread corresponding to the limiting sleeve 58, and the outer end of the limiting sleeve 58 is provided with an external thread. The limiting sleeve 58 is threadedly installed in the spring pressure hole 53. The middle part of the limiting sleeve 58 is provided with a guide hole so that the positioning pin 52 can extend out of the limiting sleeve 58. The outer end of the limiting sleeve 58 located at the guide hole is provided with an internal hexagonal hole to facilitate the installation and removal of the limiting sleeve 58. Personnel can press down the positioning pin 52 through the internal hexagonal hole and insert it into the internal hexagonal hole to rotate and install or remove the limiting sleeve 58.

[0037] The mounting structure of the locking element 5 on the second sleeve 31 is the same as that on the locking element 5 on the first sleeve 21.

[0038] Personnel can remove the locking screw 55 and then rotate the sleeve 51 to quickly disassemble and assemble the first sleeve 21 and the second sleeve 31, improving the efficiency of disassembly, assembly and maintenance. Furthermore, the tightening component further improves the connection stability between the first sleeve 21 and the machine shaft 13, and between the second sleeve 31 and the wheel shaft 14.

Claims

1. A chemical pump shaft connection mechanism, comprising a frame (1) and a motor (11) and a pump body (12) mounted on the frame (1), wherein a motor shaft (13) is provided on one side of the motor (11), and a wheel axle (14) connected to an impeller inside the pump body (12) is provided on one side of the pump body (12), and the motor shaft (13) and the wheel axle (14) are connected by a shaft connection mechanism; the shaft connection mechanism comprises a first shaft assembly (2) connected to the motor shaft (13) and a second shaft assembly connected to the wheel axle (14). (3) A buffer (4) sandwiched between the first shaft assembly (2) and the second shaft assembly (3), wherein the first shaft assembly (2) includes a first sleeve (21) and a first claw disk (22) integrally formed with the first sleeve (21), and the second shaft assembly (3) includes a second sleeve (31) and a second claw disk (32) integrally formed with the second sleeve (31), wherein claw teeth (23) are alternately distributed on opposite sides of the first claw disk (22) and the second claw disk (32), characterized in that: The buffer component (4) includes a buffer sleeve (41) and buffer teeth (42) arranged in a ring at the outer end of the buffer sleeve (41). The buffer teeth (42) are sandwiched between adjacent claw teeth (23), and pressure blocks (43) are elastically provided on both sides of the buffer teeth (42) and abut against the outer end face of the claw teeth (23). Locking components (5) are respectively provided on the first sleeve (21) and the second sleeve (31).

2. The chemical pump shaft connection mechanism according to claim 1, characterized in that: The buffer tooth (42) has a hollow cavity structure. The buffer tooth (42) has openings through which the pressure block (43) passes on both sides. The pressure block (43) is integrally provided with a side plate (44) in the inner cavity of the buffer tooth (42). The side plate (44) protrudes around the pressure block (43) so that it abuts against the inner wall of the buffer tooth (42). The pressure block (43) is a metal structure. The pressure blocks (43) are symmetrically arranged on both sides of the buffer tooth (42). An elastic element (45) is provided between the two sets of pressure blocks (43) in the buffer tooth (42) so that the pressure blocks (43) on both sides can be pushed outward by the elastic element (45) and abut against the corresponding claw tooth (23) so that the buffer element (4) and the claw tooth (23) are seamlessly connected.

3. The chemical pump shaft connection mechanism according to claim 2, characterized in that: The elastic element (45) is an elastic rubber block, with both sides of the elastic rubber block abutting against the side plate (44) to push the pressure blocks (43) on both sides to move outward.

4. The chemical pump shaft connection mechanism according to claim 2, characterized in that: One side of the buffer tooth (42) is open. The outer end of the buffer member (4) is provided with a sealing plate (46) for closing the opening of the buffer tooth (42). The sealing plate (46) has a quincunx structure, corresponding to the buffer teeth (42) arranged in a ring at the outer end. The buffer sleeve (41) and the buffer teeth (42) are provided with stepped grooves corresponding to the sealing plate (46). The sealing plate (46) is embedded in the stepped groove. A ring plate (47) is fixedly provided in the middle of the sealing plate (46). The plate (47) is inserted into the middle hole of the buffer sleeve (41). The outer end of the buffer sleeve (41) is provided with a first screw hole corresponding to the ring plate (47). The buffer sleeve (41) and the ring plate (47) are fixedly connected by the first screw (48), thereby fixing the sealing plate (46) on the buffer sleeve (41). The first screw hole has a stepped structure. The first screw (48) is installed inside the first screw hole to avoid the first screw (48) from contacting the claw teeth (23) at the outer end.

5. The chemical pump shaft connection mechanism according to claim 1, characterized in that: A protective cover (6) is installed on the outer end of the first sleeve (21) and the second sleeve (31). The protective cover (6) includes a first cover (61) and a second cover (62) that are spliced ​​together. The first cover (61) and the second cover (62) are fixedly connected by bolts that are distributed and arranged to fit on the outer end of the first claw plate (22) and the second claw plate (32). A first sealing ring (63) is provided between the first cover (61) and the first sleeve (21), a second sealing ring (64) is provided between the second cover (62) and the second sleeve (31), and a third sealing ring (65) is provided between the first cover (61) and the second cover (62).

6. The chemical pump shaft connection mechanism according to claim 1, characterized in that: The machine shaft (13) is provided with a number of keyways in a ring. The first sleeve (21) is provided with a flat key in a ring corresponding to the keyways. The first sleeve (21) is sleeved on the outer end of the machine shaft (13), and the flat key is embedded in the keyway so that the machine shaft (13) and the first sleeve (21) rotate synchronously.

7. A chemical pump shaft connection mechanism according to claim 6, characterized in that: The axle (14) is also provided with a number of keyways in a ring, and the second sleeve (31) is provided with a number of flat keys. The second sleeve (31) is sleeved on the outer end of the axle (14) and installed in the keyway by the flat keys, so that the second sleeve (31) and the axle (14) rotate synchronously.

8. The chemical pump shaft connection mechanism according to claim 7, characterized in that: The locking component (5) includes a sleeve (51) and a positioning pin (52) that cooperates with the sleeve (51). The positioning pin (52) is distributed in the spring-loaded hole (53) of the first sleeve (21). The positioning pin (52) is elastically disposed in the spring-loaded hole (53). The machine shaft (13) has a positioning hole corresponding to the positioning pin (52). The sleeve (51) is installed on the outer end of the first sleeve (21), and the sleeve (51) has an arc-shaped groove (54). The outer end of the positioning pin (52) is inserted into the swivel groove (54). The swivel sleeve (51) is rotated to gradually squeeze the positioning pin (52) by utilizing the arc surface in the swivel groove (54), thereby inserting the positioning pin (52) into the positioning hole to lock the first sleeve (21) and the machine shaft (13). The positioning pin (52) is inserted into the swivel groove (54). The swivel sleeve (51) has a locking hole on one side and is fixedly installed in the corresponding position of the first sleeve (21) by the locking screw (55).

9. A chemical pump shaft connection mechanism according to claim 8, characterized in that: The positioning pin (52) is provided with a spring plate (56), and a return spring (57) is provided in the spring pressure hole (53) to push the spring plate (56) to move outward, so that the positioning pin (52) moves outward. The outer end of the spring pressure hole (53) is provided with a limiting sleeve (58) to limit the spring plate (56). The spring pressure hole (53) is provided with an internal thread corresponding to the limiting sleeve (58), and the outer end of the limiting sleeve (58) is provided with an external thread. The limiting sleeve (58) is threadedly installed in the spring pressure hole (53). The middle part of the limiting sleeve (58) is provided with a guide hole so that the positioning pin (52) extends out of the limiting sleeve (58), and the outer end of the limiting sleeve (58) located at the guide hole is provided with an internal hexagonal hole.

10. A chemical pump shaft connection mechanism according to claim 9, characterized in that: The mounting structure of the locking element (5) on the second sleeve (31) is the same as the mounting structure of the locking element (5) on the first sleeve (21).

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