Precise worm and gear speed reducer

Abstract

The invention provides a precise worm and gear speed reducer, and relates to the technical field of speed reducers. The precise worm and gear speed reducer comprises a shell, a transmission cavity is formed in the shell, output shafts are rotationally connected to the front inner wall and the rear inner wall of the transmission cavity through first ball bearings, and worm gear bodies are fixedly connected to the circumferential faces of the output shafts; a limiting groove is formed in the left inner wall of the shell, a limiting hole is formed in the right side wall of the shell, and sliding blocks are slidably connected into the limiting groove and the limiting hole correspondingly. By arranging a limiting groove, a limiting hole, a sliding block, a positioning frame, a positioning block, a rolling bead, a threaded sleeve, a through hole, a rotating seat, an adjusting rod, a threaded part and a rotary knob, the position of a worm main body can be conveniently adjusted up and down, and therefore the meshing gap between a worm gear main body and the worm main body can be adjusted; and the position of the positioning frame can be positioned, and the worm main body is prevented from moving left and right.

Description

Technical Field

[0001] The invention relates to the technical field of reducers, in particular to a precision worm gear reducer. Background Art

[0002] A reducer is an independent component consisting of a gear drive, worm drive, or gear-worm drive enclosed in a rigid housing. It is often used as a reduction transmission device between the prime mover and the working machine. It matches the speed and transmits torque between the prime mover and the working machine or actuator. It is widely used in modern machinery, and currently worm gear reducers are the most widely used.

[0003] During use, the worm gear reducer mainly achieves the purpose of deceleration through the cooperation of the worm gear. However, the long-term cooperation of the worm gear can easily lead to wear of the worm gear. The meshing clearance between the worn worm gear will become larger, resulting in a decrease in the transmission effect. The input shaft and output shaft of the reducer are fixed and cannot be adjusted. Therefore, the worm gear can only be replaced. In addition, the meshing clearance between the replaced worm gears cannot be adjusted. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a precision worm gear reducer, which solves the problem that the meshing clearance between the worm gear and the worm gear cannot be adjusted during use of the prior art worm gear reducer.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a precision worm gear reducer, comprising a housing, a transmission cavity is arranged inside the housing, an output shaft is rotatably connected to the front and rear inner walls of the transmission cavity through a first ball bearing, and a worm gear body is fixedly connected to the circumferential surface of the output shaft; A limiting groove is provided on the left inner wall of the shell, a limiting hole is provided on the right side wall of the shell, and a slider is slidably connected to the inside of the limiting groove and the limiting hole, a worm body is rotatably connected between the two sliders through a second ball bearing, and the worm body is meshed with the worm wheel body, an input shaft is fixedly connected to the right end of the worm body, and the input shaft is located on the outside of the shell, and a blocking component is provided on the top and bottom of the limiting hole; The top of the slider is fixedly connected with a positioning frame, and the left and right side walls of the positioning frame are fixedly connected with positioning blocks, and a rolling ball is arranged on the side of the positioning block away from the positioning frame, and the top of the positioning frame is fixedly connected with a threaded sleeve, and the bottom of the positioning frame is provided with a through hole, and the through hole is located below the threaded sleeve, and the top of the shell is fixedly connected with a rotating seat, and the inside of the rotating seat is rotatably connected with an adjusting rod, and the circumferential surface of the adjusting rod is provided with a threaded portion, and is arranged on the upper and lower sides of the rotating seat, and the threaded portion at the bottom is threadedly connected to the inside of the threaded sleeve, and the top of the adjusting rod is fixedly connected with a knob; A movable plate is threadedly connected to the threaded portion above, and two connecting guide rails are fixedly connected to the bottom of the movable plate. Two sliding grooves are provided on the right side wall of the shell, and are symmetrically arranged on the front and rear sides of the limiting hole. The connecting guide rails are slidably connected to the inside of the sliding grooves, and a mounting plate is fixedly connected to the right side wall of the connecting guide rails. A circular hole is provided in the middle position of the inside of the mounting plate, and the input shaft is located inside the circular hole. A locking structure is provided between the connecting guide rail and the shell.

[0006] Preferably, the blocking assembly includes an extrusion groove, an extrusion plate, a blocking plate, a sealing gasket, a telescopic rod and a spring, the extrusion groove is arranged inside the right side wall of the shell, the extrusion plate is slidably connected inside the extrusion groove, the blocking plate is fixedly connected to a side of the extrusion plate close to the slider, and the blocking plate is located inside the limiting hole, the sealing gasket is fixedly connected to a side of the blocking plate close to the slider, the telescopic rod is fixedly connected to one side of the extrusion plate, and the other end of the telescopic rod is fixedly connected to the inner wall of the extrusion groove, and the spring is sleeved on the telescopic rod.

[0007] Preferably, the number of the blocking components is two, and they are symmetrically arranged on the upper and lower sides of the limiting hole, and the slider and the blocking plate are evenly piston-connected to the inner wall of the limiting hole.

[0008] Preferably, the locking structure includes a fastening bolt, a mounting groove and a rubber pad, the fastening bolt is threadedly connected to the inside of the connecting guide rail, the mounting groove is arranged on the left side wall of the slide groove, the rubber pad is fixedly connected to the inside of the mounting groove, and the fastening bolt and the rubber pad are arranged correspondingly.

[0009] Preferably, the top plan shapes of the slide groove and the connecting guide rail are both "convex" shapes, and the number of the locking structures is the same as the number of the slide grooves and the connecting guide rails, and they are arranged correspondingly.

[0010] Preferably, a fixing column is fixedly connected to the left side wall of the shell, a threaded block is connected to the internal thread of the fixing column, a rotating block is fixedly connected to the top of the threaded block, and the rotating block is located above the fixing column, an indicator rod is fixedly connected to the bottom of the threaded block, and the bottom end of the indicator rod extends to the bottom of the transmission cavity.

[0011] Preferably, the fixing column is inclined and hollow inside.

[0012] Preferably, connecting blocks are fixedly connected to the four corners of the front side wall of the housing, and mounting holes are provided at the four corners inside the mounting plate.

[0013] Preferably, the front shape of the positioning frame is in the shape of "冂", and a plurality of positioning blocks and rolling beads are provided, and are symmetrically arranged on the left and right sides of the positioning frame. A plurality of the left positioning blocks are symmetrically arranged on the front and rear sides of the limiting groove respectively, and a plurality of the right positioning blocks are symmetrically arranged on the front and rear sides of the limiting hole respectively.

[0014] The present invention provides a precision worm and worm gear reducer, which has the following beneficial effects: 1. In the present invention, by providing a limiting groove, a limiting hole, a slider, a positioning frame, a positioning block, a rolling bead, a threaded sleeve, a through hole, a rotating seat, an adjusting rod, a threaded portion and a knob, it is convenient to adjust the position of the worm main body up and down, so as to adjust the meshing clearance between the worm wheel main body and the worm main body. In addition, the setting of the positioning block and the rolling bead can position the position of the positioning frame and prevent the worm main body from moving left and right.

[0015] 2. In the present invention, by providing a moving plate, a sliding groove, a connecting guide rail and a mounting plate, while facilitating the up and down adjustment of the worm main body, the mounting plate is also adjusted up and down to ensure that the mounting plate is synchronized with the worm main body, thereby ensuring that the driving device is synchronized with the worm main body.

[0016] 3. In the present invention, by providing a fastening bolt, a mounting groove and a rubber pad, it is convenient to fix the adjusted connecting guide rail, thereby fixing the mounting plate, ensuring the stability of the driving device during use. In addition, the moving plate is fixed to prevent the adjusting rod from rotating, ensuring the stability of the worm main body during operation.

[0017] 4. In the present invention, by providing an extrusion groove, an extrusion plate, a plugging plate, a sealing gasket, a telescopic rod and a spring, it is convenient to plug the limiting hole, and the plugging plate is tightly attached to the slider under the action of the spring to prevent the oil inside the transmission cavity from flowing out of the limiting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the precision worm and worm gear reducer proposed by the present invention; Figure 2 is a schematic diagram of the internal structure of the precision worm and worm gear reducer proposed by the present invention; Figure 3 is Figure 2 schematic diagram of structure A in Figure 4It is a front cross-sectional view of the positioning frame of the precision worm gear reducer proposed by the present invention; Figure 5 It is a front view of the adjusting rod of the precision worm gear reducer proposed by the present invention; Figure 6 A sectional view of the side wall of the housing portion of the precision worm gear reducer proposed by the present invention; Figure 7 It is a top cross-sectional view of the slideway and connecting guide rail structure of the precision worm gear reducer proposed by the present invention; Figure 8 It is a rear view of the precision worm gear reducer proposed by the present invention; Fig. 9 It is a partial structural schematic diagram of the precision worm gear reducer proposed in the present invention.

[0019] Among them, 1. housing; 2. transmission chamber; 3. first ball bearing; 4. output shaft; 5. worm gear body; 6. limit groove; 7. limit hole; 8. slider; 9. second ball bearing; 10. input shaft; 11. worm gear body; 12. positioning frame; 13. positioning block; 14. rolling ball; 15. threaded sleeve; 16. through hole; 17. rotating seat; 18. adjusting rod; 19. threaded part; 20. knob; 21. moving plate; 22. slide groove; 23. connecting guide rail; 24. mounting plate; 25. round hole; 26. fastening bolt; 27. mounting groove; 28. rubber pad; 29. ​​extrusion groove; 30. extrusion plate; 31. sealing plate; 32. sealing pad; 33. telescopic rod; 34. spring; 35. fixing column; 36. rotating block; 37. threaded block; 38. indicator rod; 39. connecting block; 40. mounting hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example: Figure 1-9As shown, an embodiment of the present invention provides a precision worm gear reducer, including a housing 1, a transmission chamber 2 is arranged inside the housing 1, an output shaft 4 is rotatably connected to the front and rear inner walls of the transmission chamber 2 through a first ball bearing 3, the front end of the output shaft 4 extends to the outside of the housing 1, and the output shaft 4 is rotatably connected to the housing 1, a worm wheel body 5 is fixedly connected to the circumferential surface of the output shaft 4, the first ball bearing 3 and the second ball bearing 9 are both double-ring structures, the inner ring and the outer ring rotate through the balls, the outer ring of the first ball bearing 3 is fixed to the housing 1, the outer ring of the second ball bearing 9 is fixed to the slider 8, and in addition, the first ball bearing 3 and the second ball bearing 9 are both provided with shaft sealing structures to prevent the lubricating oil inside the transmission chamber 2 from overflowing from the first ball bearing 3 and the second ball bearing 9; A limiting groove 6 is provided on the left inner wall of the housing 1. The setting of the limiting groove 6 and the limiting hole 7 facilitates the slider 8 to move up and down, and facilitates fine-tuning of the up and down position of the worm body 11, so as to adjust the meshing clearance between the worm wheel body 5 and the worm body 11. A limiting hole 7 is provided on the right side wall of the housing 1, and the limiting groove 6 and the limiting hole 7 are both slidably connected with the slider 8. The two sliders 8 are rotatably connected with the worm body 11 through the second ball bearing 9, and the worm body 11 is meshed with the worm wheel body 5. The right end of the worm body 11 is fixedly connected with the input shaft 10, and the input shaft 10 is located on the outside of the housing 1. The top and bottom of the limiting hole 7 are provided with a plugging component, which mainly blocks the limiting hole 7 to prevent the lubricating oil inside the transmission cavity 2 from overflowing from the limiting hole 7; The top of the slider 8 is fixedly connected with a positioning frame 12. The setting of the positioning frame 12 is convenient for connecting the limiting groove 6 with the slider 8 inside the limiting hole 7, so that the adjusting rod 18 can control the two sliders 8 to move up and down at the same time. The left and right side walls of the positioning frame 12 are fixedly connected with positioning blocks 13. The setting of the positioning blocks 13 is mainly used to limit the positioning frame 12 to prevent the positioning frame 12 from swinging left and right during the up and down movement, thereby ensuring the stability of the worm body 11 and preventing the worm body 11 from deviating left and right. A rolling ball 14 is set on the side of the positioning block 13 away from the positioning frame 12. The setting of the rolling ball 14 is mainly used to reduce the friction between the positioning block 13 and the inner wall of the shell 1 during the up and down movement. The top of the positioning frame 12 is fixedly connected with a threaded sleeve 15. The setting of the threaded sleeve 15 is convenient for the adjusting rod 18 to control the positioning frame 12 to drive the slider 8 to move up and down while rotating, thereby driving the worm body 11 to move up and down. When the adjusting rod 18 rotates forward, the worm body 11 moves upward, and the adjusting When the rod 18 rotates in the opposite direction, the worm body 11 moves downward, and a through hole 16 is provided at the bottom of the positioning frame 12, and the through hole 16 is located below the threaded sleeve 15. The setting of the through hole 16 is convenient for the bottom end of the adjusting rod 18 to pass through the positioning frame 12, but the adjusting rod 18 will not contact the worm body 11. In addition, when the positioning frame 12 moves to the bottom, the adjusting rod 18 will not fall from the inside of the threaded sleeve 15. A rotating seat 17 is fixedly connected to the top of the shell 1, and an adjusting rod 18 is rotatably connected inside the rotating seat 17. A threaded portion 19 is provided on the circumferential surface of the adjusting rod 18, and is provided on the upper and lower sides of the rotating seat 17. The thread directions of the threaded portions 19 on the upper and lower sides are the same, and the thread pitches are also the same, so as to facilitate the control of the moving plate 21 and the worm body 11 to move up and down by the same distance, thereby ensuring that the moving plate 21 and the worm body 11 are synchronized. The lower threaded portion 19 is threadedly connected to the inside of the threaded sleeve 15. A knob 20 is fixedly connected to the top of the adjusting rod 18, and the knob 20 is mainly used to control the rotation of the adjusting rod 18. A movable plate 21 is threadedly connected to the upper threaded portion 19. The movable plate 21, the connecting guide rail 23, the slide groove 22 and the mounting plate 24 are arranged so that the driving device installed on the mounting plate 24 can keep synchronization with the worm body 11 during the up and down movement. Two connecting guide rails 23 are fixedly connected to the bottom of the movable plate 21. Two slide grooves 22 are arranged on the right side wall of the housing 1 and are symmetrically arranged on the front and rear sides of the limiting hole 7. The connecting guide rail 23 is slidably connected to the inside of the slide groove 22. The mounting plate 24 is fixedly connected to the right side wall of the connecting guide rail 23. The mounting plate 24 is arranged mainly for installing an external driving device (motor, FIG. Not shown in the figure), when the drive device is installed, the drive shaft on the drive device and the input shaft 10 will be connected together through a coupling, a circular hole 25 is provided at the middle position inside the mounting plate 24, and the input shaft 10 is located inside the circular hole 25, and a locking structure is provided between the connecting guide rail 23 and the housing 1, and the locking structure mainly locks the connecting guide rail 23 to ensure the stability of the drive device on the mounting plate 24 during operation. In addition, when the connecting guide rail 23 is locked, the adjusting rod 18 cannot rotate due to the moving plate 21, so the worm body 11 cannot move up and down by itself during operation, and also remains stable.

[0022] The blocking assembly includes an extrusion groove 29, an extrusion plate 30, a blocking plate 31, a sealing gasket 32, a telescopic rod 33 and a spring 34. The spring 34 is always in a compressed state, and the elastic force of the spring 34 is much greater than the friction between the blocking plate 31 and the inner wall of the extrusion groove 29. When the slider 8 moves, the blocking plates 31 on the upper and lower sides will fit tightly with the slider 8 under the action of the spring 34 to prevent the lubricating oil inside the transmission cavity 2 from overflowing from the inside of the limiting hole 7. The sealing gasket 32 ​​mainly seals the connection between the blocking plate 31 and the slider 8. The telescopic rod 33 itself has a telescopic function, which mainly limits the extrusion plate 30 so that the extrusion plate 30 can slide stably to avoid tilting. Multiple telescopic rods 33 and springs 34 can be provided here. In addition, the telescopic rod 33 can also limit the spring 34 to prevent the spring 34 from bending. The extrusion groove 29 is arranged inside the right side wall of the shell 1, the extrusion plate 30 is slidably connected inside the extrusion groove 29, the sealing plate 31 is fixedly connected to the side of the extrusion plate 30 close to the slider 8, and the sealing plate 31 is located inside the limiting hole 7, the sealing gasket 32 ​​is fixedly connected to the side of the sealing plate 31 close to the slider 8, the telescopic rod 33 is fixedly connected to one side of the extrusion plate 30, and the other end of the telescopic rod 33 is fixedly connected to the inner wall of the extrusion groove 29, the spring 34 is sleeved on the telescopic rod 33, the number of sealing components is set to two, and they are symmetrically arranged on the upper and lower sides of the limiting hole 7, the slider 8 and the sealing plate 31 are evenly piston-connected to the inner wall of the limiting hole 7 to prevent the lubricating oil from overflowing from the gap between the slider 8, the sealing plate 31 and the inner wall of the limiting hole 7.

[0023] The locking structure includes a fastening bolt 26, a mounting groove 27 and a rubber pad 28. When the fastening bolt 26 is tightened, the fastening bolt 26 will closely fit with the rubber pad 28, and the friction between the fastening bolt 26 and the rubber pad 28 is relatively large, so there will be no sliding. The fastening bolt 26 is threadedly connected inside the connecting guide rail 23. The mounting groove 27 is arranged on the left side wall of the sliding groove 22. The rubber pad 28 is fixedly connected inside the mounting groove 27, and the fastening bolt 26 and the rubber pad 28 are arranged correspondingly. The top views of the sliding groove 22 and the connecting guide rail 23 are both in the shape of a "convex" character, which can prevent the connecting guide rail 23 from falling off from inside the sliding groove 22. The number of the locking structures is the same as that of the sliding groove 22 and the connecting guide rail 23, and they are arranged correspondingly.

[0024] A fixing column 35 is fixedly connected to the left side wall of the housing 1. A threaded block 37 is threadedly connected inside the fixing column 35. The top end of the threaded block 37 is fixedly connected with a rotating block 36, and the rotating block 36 is located above the fixing column 35. The bottom end of the threaded block 37 is fixedly connected with an indicating rod 38, and the bottom end of the indicating rod 38 extends to the bottom of the transmission cavity 2. The setting of the indicating rod 38 is convenient for determining the remaining amount of lubricating oil inside the transmission cavity 2. The fixing column 35 is obliquely arranged, and the inside of the fixing column 35 is hollowed out. The top of the fixing column 35 is provided with an internal thread structure that matches the threaded block 37.

[0025] Connecting blocks 39 are fixedly connected to the four corner positions of the front side wall of the housing 1. The setting of the connecting blocks 39 is convenient for fixing the housing 1 on the equipment that needs to be driven. The connecting blocks 39 are also provided with mounting holes 40, which is convenient for fixing with bolts and nuts. Mounting holes 40 are arranged at the four corner positions inside the mounting plate 24, which is convenient for using bolts and nuts to fix an external driving device on the mounting plate 24. The front shape of the positioning frame 12 is in the shape of a "冂" character. The number of the positioning blocks 13 and the rolling beads 14 are both set to be multiple, and they are symmetrically arranged on the left and right sides of the positioning frame 12. Multiple left-side positioning blocks 13 are respectively symmetrically arranged on the front and rear sides of the limiting groove 6, and multiple right-side positioning blocks 13 are respectively symmetrically arranged on the front and rear sides of the limiting hole 7.

[0026] An inspection opening and a corresponding inspection door are arranged on the rear wall of the housing 1, which is convenient for later maintenance. The first ball bearing 3 is located below the inspection opening. The inspection door is provided with an observation window, and a scale mark is arranged on one side of the observation window (as Figure 8 shown), which is convenient for the staff to observe when adjusting the worm main body 11. At the same time, it is also convenient to observe the state between the worm wheel main body 5 and the worm main body 11 during the operation of the speed reducer. The observation window is arranged at the meshing position of the worm wheel main body 5 and the worm main body 11.

[0027] The adjustment method includes the following specific steps: S1. When the meshing clearance between the worm wheel body 5 and the worm body 11 needs to be adjusted, firstly use a wrench to reversely rotate the fastening bolt 26 to separate the fastening bolt 26 from the rubber pad 28; S2. When the meshing clearance between the worm wheel body 5 and the worm body 11 is too large, the knob 20 is rotated in the opposite direction to move the worm body 11 downward, and at the same time, the moving plate 21 controls the connecting guide rail 23 and the mounting plate 24 to move downward; S3. During the adjustment process, the blocking plate 31 is tightly fitted with the slider 8 inside the limiting hole 7 under the action of the spring 34; S4. When the meshing clearance between the worm wheel body 5 and the worm body 11 is too small, the knob 20 is turned forward to move the worm body 11 upward, and at the same time, the moving plate 21 controls the connecting guide rail 23 and the mounting plate 24 to move upward; S5. After the adjustment is completed, the fastening bolt 26 is rotated forwardly again through the plate type so that the fastening bolt 26 and the rubber pad 28 are tightly fitted. At this time, the connecting guide rail 23 and the movable plate 21 are also fixed, so the adjusting rod 18 cannot rotate, thereby ensuring the stability of the positioning frame 12 and the worm body 11 during operation.

[0028] 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 precision worm gear reducer, comprising a housing (1), characterized in that: A transmission chamber (2) is provided inside the housing (1); an output shaft (4) is rotatably connected to the front and rear inner walls of the transmission chamber (2) via a first ball bearing (3); a worm gear body (5) is fixedly connected to the circumferential surface of the output shaft (4); A limiting groove (6) is provided on the left inner wall of the housing (1), a limiting hole (7) is provided on the right side wall of the housing (1), and a slider (8) is slidably connected to the inside of the limiting groove (6) and the limiting hole (7), a worm body (11) is rotatably connected between the two sliders (8) via a second ball bearing (9), and the worm body (11) is meshed with the worm wheel body (5), the right end of the worm body (11) is fixedly connected to an input shaft (10), and the input shaft (10) is located outside the housing (1), and blocking components are provided at the top and bottom of the limiting hole (7); The top of the slider (8) is fixedly connected to a positioning frame (12), and the left and right side walls of the positioning frame (12) are fixedly connected to positioning blocks (13), and a rolling ball (14) is arranged on the side of the positioning block (13) away from the positioning frame (12). The top of the positioning frame (12) is fixedly connected to a threaded sleeve (15), and the bottom of the positioning frame (12) is provided with a through hole (16), and the through hole (16) is located below the threaded sleeve (15). The top of the housing (1) is fixedly connected to a rotating seat (17), and the interior of the rotating seat (17) is rotatably connected to an adjusting rod (18), and a threaded portion (19) is arranged on the circumferential surface of the adjusting rod (18), and is arranged on the upper and lower sides of the rotating seat (17), and the threaded portion (19) at the bottom is threadedly connected to the interior of the threaded sleeve (15), and the top of the adjusting rod (18) is fixedly connected to a knob (20); A movable plate (21) is threadedly connected to the threaded portion (19) above, and two connecting guide rails (23) are fixedly connected to the bottom of the movable plate (21). Two slide grooves (22) are provided on the right side wall of the housing (1), and are symmetrically arranged on the front and rear sides of the limiting hole (7). The connecting guide rail (23) is slidably connected inside the slide groove (22). A mounting plate (24) is fixedly connected to the right side wall of the connecting guide rail (23), and a circular hole (25) is provided at the middle position inside the mounting plate (24), and the input shaft (10) is located inside the circular hole (25). A locking structure is provided between the connecting guide rail (23) and the housing (1).

2. The precision worm gear reducer according to claim 1, characterized in that: The plugging assembly includes an extrusion groove (29), an extrusion plate (30), a plugging plate (31), a gasket (32), a telescopic rod (33) and a spring (34). The extrusion groove (29) is arranged inside the right side wall of the housing (1). The extrusion plate (30) is slidably connected inside the extrusion groove (29). The plugging plate (31) is fixedly connected to one side of the extrusion plate (30) close to the slider (8), and the plugging plate (31) is located inside the limit hole (7). The gasket (32) is fixedly connected to one side of the plugging plate (31) close to the slider (8). The telescopic rod (33) is fixedly connected to one side of the extrusion plate (30), and the other end of the telescopic rod (33) is fixedly connected to the inner wall of the extrusion groove (29). The spring (34) is sleeved on the telescopic rod (33).

3. The precision worm gear reducer according to claim 2, characterized in that: The number of the plugging assemblies is two, and they are symmetrically arranged on the upper and lower sides of the limit hole (7). The slider (8) and the plugging plate (31) are both piston-connected to the inner wall of the limit hole (7).

4. The precision worm gear reducer according to claim 1, characterized in that: The locking structure includes a fastening bolt (26), an installation groove (27) and a rubber pad (28). The fastening bolt (26) is threadedly connected inside the connecting guide rail (23). The installation groove (27) is arranged on the left side wall of the sliding groove (22). The rubber pad (28) is fixedly connected inside the installation groove (27), and the fastening bolt (26) is arranged corresponding to the rubber pad (28).

5. The precision worm gear reducer according to claim 2, characterized in that: The top views of the sliding groove (22) and the connecting guide rail (23) are both in the shape of a "convex" character. The number of the locking structures is the same as that of the sliding groove (22) and the connecting guide rail (23), and they are arranged correspondingly.

6. The precision worm gear reducer according to claim 1, characterized in that: A fixing column (35) is fixedly connected to the left side wall of the housing (1). A threaded block (37) is threadedly connected inside the fixing column (35). The top end of the threaded block (37) is fixedly connected with a rotating block (36), and the rotating block (36) is located above the fixing column (35). The bottom end of the threaded block (37) is fixedly connected with an indicating rod (38), and the bottom end of the indicating rod (38) extends to the bottom of the transmission cavity (2).

7. The precision worm gear reducer according to claim 6, characterized in that: The fixing column (35) is inclined, and the inside of the fixing column (35) is hollowed out.

8. The precision worm gear reducer according to claim 1, characterized in that: Connecting blocks (39) are fixedly connected to the four corners of the front side wall of the housing (1). Installation holes (40) are arranged at the four corners inside the mounting plate (24).

9. The precision worm gear reducer according to claim 1, characterized in that: The front shape of the positioning frame (12) is in the shape of a "冂" character. The number of the positioning blocks (13) and the rolling beads (14) is set to be multiple, and they are symmetrically arranged on the left and right sides of the positioning frame (12). Multiple left-side positioning blocks (13) are symmetrically arranged on the front and rear sides of the limit groove (6) respectively. Multiple right-side positioning blocks (13) are symmetrically arranged on the front and rear sides of the limit hole (7) respectively.

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