Numerical control machine tool for electromagnetic induction quenching of shaft parts

Abstract

The invention discloses an electromagnetic induction quenching numerical control machine tool for shaft parts, and particularly relates to the technical field of quenching machine tools, the electromagnetic induction quenching numerical control machine tool comprises a machine shell, a downward moving electric cylinder, a push block and a multi-point positioning mechanism; wherein the multi-point positioning mechanism comprises a sleeve block, a distance sensor, a support plate, a plurality of positioning rods and a bearing; the device further comprises a multi-point cooling temperature control mechanism and a multi-point temperature control heating mechanism. Through the multi-point positioning mechanism, a plurality of bearings are inserted into the outer walls of a plurality of positioning rods correspondingly, a downward moving electric cylinder is started through a controller, and the beneficial effects that positioning heating and positioning cooling can be achieved on the multiple bearings, and accurate quenching can be achieved on the multiple bearings are achieved; therefore, the problems that in the heating process, due to the fact that the specific temperatures of the multiple shaft parts are difficult to accurately know, and in the cooling process, the specific cooling values of the multiple shaft parts are difficult to know, and accurate quenching of the multiple shaft parts is difficult to achieve are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of quenching machine tools, and more specifically, to a CNC machine tool for electromagnetic induction quenching of shaft parts. Background Art

[0002] The CNC machine tool for electromagnetic induction hardening of shaft parts works based on the principle of electromagnetic induction. When a high-frequency current passes through the induction coil of the machine tool, an alternating magnetic field is generated around it. When the shaft parts are placed in this magnetic field, due to the electromagnetic induction effect, eddy currents will be generated inside the parts. The eddy currents will generate heat under the action of the part's own resistance, causing the surface of the parts to heat up rapidly. When the surface temperature of the parts reaches the critical temperature required for quenching, the parts are quickly cooled through a pre-set cooling system, prompting the formation of martensitic structure on the surface of the parts, thereby achieving the purpose of quenching heat treatment.

[0003] In the existing public documents, the patent with patent announcement number CN103484629A discloses a CNC energy-saving double-station induction quenching machine tool, which includes two heating trays and two quenching trays through four processing trays, and the trays of the same type are arranged diagonally, and the frame includes free-moving loading and unloading manipulators on both sides, and the frame is respectively provided with two sets of quenching machines and chillers, and two sets of electrical control systems correspond to the two sets of quenching machines and chillers respectively. The invention has the advantages of high efficiency, low cost and low energy consumption. However, the technology still has the following problems.

[0004] This CNC machine tool performs electromagnetic induction quenching on shaft parts, so it is difficult to achieve simultaneous precise heating and simultaneous precise cooling of multiple shaft parts during the quenching process. During the heating process, it is difficult to accurately know the specific temperatures of multiple shaft parts when they are heated, and it is difficult for the coolant to know the specific temperature reduction values ​​of multiple shaft parts. Therefore, it is difficult to achieve precise quenching of multiple shaft parts. For this purpose, a CNC machine tool for electromagnetic induction quenching of shaft parts is needed. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides the following technical solutions: a CNC machine tool for electromagnetic induction hardening of shaft parts, comprising a casing, a downward moving electric cylinder and a push block, wherein the downward moving electric cylinder is fixed to one side of the inner wall of the casing, the push block is fixedly connected to the output end of the downward moving electric cylinder, and a multi-point positioning mechanism is provided on one side of the push block;

[0006] The multi-point positioning mechanism includes a sleeve block fixedly arranged on one side of the push block, and a distance sensor is fixedly installed on the inner wall of the sleeve block, a support plate is fixedly connected to one side of the sleeve block, a plurality of positioning rods are fixedly installed on the upper surface of the support plate, and a bearing is inserted into the outer wall of each positioning rod; a multi-point cooling and temperature control mechanism is provided on one side of the support plate; and a multi-point temperature control and heating mechanism is provided on the top of the inner wall of the casing.

[0007] Preferably, the upper surface of the push block and the upper surface of the sleeve block are in the same horizontal plane, and the push block and the sleeve block are both made of stainless steel. The cross-sectional shapes of the plurality of positioning rods are all circular, and the top ends of the positioning rods are chamfered. Two cover doors are hinged on one side of the casing, and a controller is provided on one side of one of the cover doors. A support frame is installed on the top of the controller, and the casing and the controller are fixedly connected to the support frame. The top of the casing is fixedly connected to a reinforcement shell, and a support column is fixedly installed on the top of the reinforcement shell; a plurality of bases are fixedly installed on the bottom end of the casing. An external pipe is inserted into the outer wall of the casing, and a liquid inlet pipe is fixedly installed at the rear of the casing, and the liquid inlet pipe and the external pipe are both connected to the casing.

[0008] In this technical solution, after each bearing is heated to a precise temperature, the downward electric cylinder pushes the push block downward, the sleeve block drives the distance sensor downward, the support plate drives multiple positioning rods to move downward synchronously, and multiple bearings can enter the cooling box inside the casing, and the distance sensor senses the distance to the bottom of the inner wall of the casing. When the distance value sensed by the distance sensor is the same as the distance value set by the controller, the downward electric cylinder is closed by the controller.

[0009] Preferably, the multi-point cooling temperature control mechanism comprises an L-shaped frame plate fixedly arranged on one side of the support plate; the inner wall of the L-shaped frame plate is rotatably connected with a linkage screw, a reduction motor is fixedly installed on one side of the L-shaped frame plate, the reduction motor is used to drive the linkage screw to rotate, the outer wall of the linkage screw is threadedly connected with a socket block, and the socket block and the L-shaped frame plate are slidably connected; a socket strip is welded on one side of the socket block, and two first temperature sensors are fixedly installed on the inner wall of the socket strip. The outer wall of the socket block and the inner wall of the L-shaped frame plate are both smooth surfaces, and the vertical cross-section of the socket strip is L-shaped.

[0010] In this technical solution, the support plate is pushed down by the linkage electric cylinder, and the support frame drives multiple electromagnetic heaters to move down synchronously. By starting multiple electromagnetic heaters, the electromagnetic heaters can achieve electromagnetic induction heating of the bearings. At the same time, the linkage motor is started to drive the driving screw to rotate, and the threaded sleeve block drives the two sleeves to move right synchronously. The two second temperature sensors respectively sense the temperature of the two rows of bearings.

[0011] Preferably, the multi-point temperature-controlled heating mechanism includes a linkage electric cylinder fixedly arranged at the top end of the inner wall of the machine shell; the output end of the linkage electric cylinder is fixedly installed with a support plate, the bottom end of the support plate is welded with a support frame, and a driving screw is rotatably connected to the inner wall of the support frame; a linkage motor is fixedly installed at one end of the support frame, a threaded sleeve block is threadedly connected to the outer wall of the driving screw, two sleeve bars are fixedly installed on both sides of the threaded sleeve block, and a second temperature sensor is fixedly installed on the inner wall of each sleeve bar; a plurality of electromagnetic heaters are fixedly installed on both sides of the support frame. The output end of the linkage motor is fixedly connected to the driving screw, and the linkage motor is used to drive the driving screw to rotate, and the driving screw is rotatably connected to the support frame.

[0012] In this technical solution, multiple bearings are cooled, and at the same time, the reduction motor is started through the controller. The linkage screw drives the socket block to move rightward under the action of the threaded driving force. The socket strip drives the two first temperature sensors to move rightward, and the two first temperature sensors respectively sense the temperature along the upper sides of the two rows of bearings, so as to realize the temperature sensing operation of the two rows of bearings.

[0013] The technical effects and advantages of the present invention are as follows:

[0014] 1. Through the multi-point positioning mechanism of the present invention, multiple bearings are respectively inserted on the outer walls of multiple positioning rods. The lowering electric cylinder is started through the controller, the lowering electric cylinder pushes the push block to move downward, the socket block drives the distance sensor to move downward, and at the same time the socket block drives the support plate to move downward. The positioning rods cause the bearings to move downward, and multiple bearings can enter the cooling box inside the machine shell. When the distance value sensed by the distance sensor is the same as the distance value set by the controller, the lowering electric cylinder is closed through the controller, and positioning heating and positioning cooling of multiple bearings can be realized, and precise quenching of multiple bearings can be achieved.

[0015] 2. The present invention adopts a multi-point cooling temperature control mechanism. Multiple bearings are cooled. The reduction motor drives the linkage screw to rotate. The socket block drives the socket strip to move rightward. The socket strip drives the two first temperature sensors to move rightward. The two first temperature sensors respectively sense the temperature along the upper sides of the two rows of bearings. When the temperatures of multiple bearings are all reduced to the cooling temperature set by the controller, the reduction motor is closed through the controller. In this way, it can be accurately known that multiple bearings can be cooled to the specified temperature value, so that multiple bearings can be accurately cooled and quenched, and precise quenching is realized.

[0016] 3. The present invention utilizes a multi-point temperature control and heating mechanism, and pushes the support plate downward through a linkage electric cylinder, and the support plate drives the support frame downward, and multiple electromagnetic heaters move downward synchronously. The multiple electromagnetic heaters are respectively located at the outer wall of the bearing. By starting multiple electromagnetic heaters, the linkage motor is started to drive the driving screw to rotate, and the driving screw drives the threaded sleeve to move right under the action of the thread, and the sleeve drives the second temperature sensor to move right. When the temperature of each bearing exceeds the temperature value set by the controller, the linkage motor is turned off by the controller, so that multiple bearings can be precisely heated and controlled according to the specified temperature, and precise quenching can be achieved.

[0017] The interaction of the above multiple functions firstly realizes the positioning heating and positioning cooling of multiple bearings, secondly enables multiple bearings to realize precise heating and temperature control according to the specified temperature, and finally accurately knows that multiple bearings can be cooled to the specified temperature value. In summary, the specific heating temperature can be accurately known, and the coolant can accurately know the specific cooling value of multiple shaft parts, so accurate quenching can be achieved for multiple shaft parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the CNC machine tool for electromagnetic induction quenching of shaft parts of the present invention.

[0019] Figure 2 It is a rear view structural schematic diagram of the CNC machine tool for electromagnetic induction quenching of shaft parts of the present invention.

[0020] Figure 3 It is a schematic diagram of the vertical cross-section structure of the CNC machine tool for electromagnetic induction quenching of shaft parts of the present invention.

[0021] Figure 4 It is a schematic diagram of the local structure of the vertical section of the connection between the housing and the downward moving electric cylinder of the present invention.

[0022] Figure 5 It is a schematic diagram of the partial structure of the connection between the socket block and the socket strip of the present invention.

[0023] Figure 6 It is a schematic diagram of a partial structure of the multi-point temperature control and heating mechanism of the present invention in a front view.

[0024] The accompanying drawings are marked as follows: 1. casing; 2. lowering electric cylinder; 3. pushing block; 4. sleeve block; 5. distance sensor; 6. support plate; 7. positioning rod; 8. bearing; 9. cover door; 10. controller; 11. external discharge pipe; 12. liquid inlet pipe; 13. support frame; 14. reinforcement shell; 15. support column; 16. base; 17. L-shaped frame plate; 18. linkage screw; 19. reduction motor; 20. sleeve block; 21. sleeve strip; 22. first temperature sensor; 23. linkage electric cylinder; 24. support plate; 25. support frame; 26. driving screw; 27. linkage motor; 28. threaded sleeve block; 29. ​​sleeve strip; 30. second temperature sensor; 31. electromagnetic heater. DETAILED DESCRIPTION

[0025] 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.

[0026] As attached Figure 1-6 A CNC machine tool for electromagnetic induction quenching of shaft parts is shown. The CNC machine tool for electromagnetic induction quenching of shaft parts is equipped with a multi-point positioning mechanism, a multi-point cooling and temperature control mechanism, and a multi-point temperature control and heating mechanism. The setting of each mechanism can realize accurate knowledge of its specific heating temperature, and the coolant can accurately know the specific cooling values ​​of multiple shaft parts. Therefore, precise quenching of multiple shaft parts can be achieved. The specific structural settings of each mechanism are as follows.

[0027] In this technical solution, as shown in the attached Figure 1-4 As shown, the lower electric cylinder 2 is fixed on one side of the inner wall of the casing 1, the push block 3 is fixedly connected to the output end of the lower electric cylinder 2, and a multi-point positioning mechanism is provided on one side of the push block 3; the multi-point positioning mechanism includes a sleeve block 4 fixedly arranged on one side of the push block 3, and a distance sensor 5 is fixedly installed on the inner wall of the sleeve block 4, a support plate 6 is fixedly connected to one side of the sleeve block 4, and a plurality of positioning rods 7 are fixedly installed on the upper surface of the support plate 6, and a bearing 8 is inserted into the outer wall of each positioning rod 7; a multi-point cooling and temperature control mechanism is provided on one side of the support plate 6; a multi-point temperature control and heating mechanism is provided on the top of the inner wall of the casing 1. The upper surface of the push block 3 and the upper surface of the sleeve block 4 are in the same horizontal plane, and the push block 3 and the sleeve block 4 are both made of stainless steel. The cross-sectional shape of the plurality of positioning rods 7 is circular, and the top of the positioning rod 7 is chamfered.

[0028] In this technical solution, as shown in the attached Figure 1-2As shown, two cover doors 9 are hinged on one side of the housing 1, and a controller 10 is provided on one side of one of the cover doors 9. A support frame 13 is installed on the top of the controller 10. The housing 1 and the controller 10 are fixedly connected to the support frame 13, so that the support frame 13 supports the controller 10. Then, the two cover doors 9 are opened, and the multiple bearings 8 can be respectively inserted into the outer walls of the multiple positioning rods 7. The top of the housing 1 is fixedly connected to a reinforcement shell 14, and a support column 15 is fixedly installed on the top of the reinforcement shell 14; the bottom end of the housing 1 is fixedly installed with multiple bases 16, so that the bottom end of the housing 1 is supported by the multiple bases 16. At the same time, the support frame 13 and the support column 15 support the reinforcement shell 14, and the reinforcement shell 14 supports the housing 1, which greatly improves the high stability of the housing 1 when in use. An external pipe 11 is inserted into the outer wall of the casing 1, and a liquid inlet pipe 12 is fixedly installed at the rear of the casing 1. The liquid inlet pipe 12 and the external pipe 11 are both connected to the casing 1, so that the liquid inlet pipe 12 can be connected to the coolant inlet pipe and connected to the cooling water outlet pipe through the external pipe 11 to achieve a connecting and docking operation.

[0029] In this technical solution, as shown in the attached Figure 4-5 As shown, the multi-point cooling temperature control mechanism includes an L-shaped frame plate 17 fixedly arranged on one side of the support plate 6; the inner wall of the L-shaped frame plate 17 is rotatably connected with a linkage screw 18, and a reduction motor 19 is fixedly installed on one side of the L-shaped frame plate 17, and the reduction motor 19 is used to drive the linkage screw 18 to rotate, and the outer wall of the linkage screw 18 is threadedly connected with a sleeve block 20, and the sleeve block 20 and the L-shaped frame plate 17 are slidably connected; a sleeve strip 21 is welded on one side of the sleeve block 20, and two first temperature sensors 22 are fixedly installed on the inner wall of the sleeve strip 21. The outer wall of the sleeve block 20 and the inner wall of the L-shaped frame plate 17 are both smooth surfaces, and the vertical cross-section of the sleeve strip 21 is L-shaped.

[0030] In this technical solution, as shown in the attached Figure 6 As shown, the multi-point temperature control and heating mechanism includes a linkage electric cylinder 23 fixedly arranged at the top of the inner wall of the casing 1; a support plate 24 is fixedly installed at the output end of the linkage electric cylinder 23, a support frame 25 is welded at the bottom end of the support plate 24, and a driving screw 26 is rotatably connected to the inner wall of the support frame 25; a linkage motor 27 is fixedly installed at one end of the support frame 25, a threaded sleeve block 28 is threadedly connected to the outer wall of the driving screw 26, sleeve strips 29 are fixedly installed on both sides of the threaded sleeve block 28, and a second temperature sensor 30 is fixedly installed on the inner wall of each sleeve strip 29; and a plurality of electromagnetic heaters 31 are fixedly installed on both sides of the support frame 25. The output end of the linkage motor 27 is fixedly connected to the driving screw 26, and the linkage motor 27 is used to drive the driving screw 26 to rotate, and the driving screw 26 is rotatably connected to the support frame 25.

[0031] The working principle of the electromagnetic induction hardening CNC machine tool for shaft parts of the present invention is as follows:

[0032] Step 1: During preparation, the bottom end of the housing 1 is supported by multiple bases 16, while the support frame 13 and the support column 15 support the reinforcement shell 14, the reinforcement shell 14 supports the housing 1, and the support frame 13 supports the controller 10, and the liquid inlet pipe 12 is connected to the coolant inlet pipe, and connected to the cooling water outlet pipe through the external discharge pipe 11. Then open the two cover doors 9, and insert the multiple bearings 8 on the outer walls of the multiple positioning rods 7 respectively, and realize the inner wall positioning operation of the bearings 8 through the positioning rods 7.

[0033] Step 2: During multi-point temperature control heating, the support plate 24 is pushed downward by the linkage electric cylinder 23, and the support plate 24 drives the support frame 25 downward, and the support frame 25 drives multiple electromagnetic heaters 31 to move downward synchronously. Multiple electromagnetic heaters 31 are respectively located at the outer wall of the bearing 8. By starting multiple electromagnetic heaters 31, the electromagnetic heaters 31 can achieve electromagnetic induction heating of the bearing 8. At the same time, the linkage motor 27 is started to drive the driving screw 26 to rotate, and the driving screw 26 drives the threaded sleeve 28 to move right under the action of the thread. The threaded sleeve 28 drives the two sleeve strips 29 to move right synchronously, and the sleeve strip 29 drives the second temperature sensor 30 to move right. The two second temperature sensors 30 respectively sense the temperature of the two rows of bearings 8. When the temperature of each bearing 8 exceeds the temperature value set by the controller 10, the linkage motor 27 is turned off by the controller 10.

[0034] Step 3: During multi-point positioning, after each bearing 8 is heated to a precise temperature, the controller 10 is used to start the downward electric cylinder 2, which pushes the push block 3 downward, which drives the sleeve block 4 downward, which drives the distance sensor 5 downward, and at the same time, the sleeve block 4 drives the support plate 6 downward. The support plate 6 drives multiple positioning rods 7 to move downward synchronously, and the positioning rods 7 enable the bearings 8 to move downward, so that multiple bearings 8 can enter the cooling box inside the casing 1, and the cooling operation can be achieved through the cooling water inside the casing 1, and the distance sensor 5 is used to sense the distance of the bottom end of the inner wall of the casing 1. When the distance value sensed by the distance sensor 5 is the same as the distance value set by the controller 10, the downward electric cylinder 2 is closed by the controller 10.

[0035] Step 4: When cooling and controlling the temperature at multiple points, multiple bearings 8 are cooled and the reduction motor 19 is started by the controller 10 at the same time. The reduction motor 19 drives the linkage screw 18 to rotate, and the linkage screw 18 drives the sleeve block 20 to move right under the action of the thread transmission force. The sleeve block 20 drives the sleeve bar 21 to move right, and the sleeve bar 21 drives the two first temperature sensors 22 to move right. The two first temperature sensors 22 respectively sense the temperature above the two rows of bearings 8, and the sensing operation of the temperature of the two rows of bearings 8 can be realized. When the temperature of multiple bearings 8 is reduced to the cooling temperature set by the controller 10, the reduction motor 19 is turned off by the controller 10.

[0036] The contents not described in detail in the specification belong to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used. In this technical solution, the electrical control components not mentioned are not shown in the figure because they belong to the prior art and will not be described here.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A CNC machine tool for electromagnetic induction hardening of shaft parts, comprising a housing (1), a lowering electric cylinder (2) and a push block (3), wherein the lowering electric cylinder (2) is fixed to one side of the inner wall of the housing (1), and the push block (3) is fixedly connected to the output end of the lowering electric cylinder (2), characterized in that: A multi-point positioning mechanism is provided on one side of the push block (3); The multi-point positioning mechanism comprises a sleeve block (4) fixedly arranged on one side of the push block (3), and a distance sensor (5) is fixedly installed on the inner wall of the sleeve block (4), a support plate (6) is fixedly connected to one side of the sleeve block (4), and a plurality of positioning rods (7) are fixedly installed on the upper surface of the support plate (6), and a bearing (8) is inserted into the outer wall of each positioning rod (7); A multi-point cooling and temperature control mechanism is provided on one side of the support plate (6); The top end of the inner wall of the casing (1) is provided with a multi-point temperature control and heating mechanism.

2. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 1, characterized in that: The upper surface of the push block (3) and the upper surface of the sleeve block (4) are on the same horizontal plane, and the push block (3) and the sleeve block (4) are both made of stainless steel.

3. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 1, characterized in that: The cross-sectional shapes of the plurality of positioning rods (7) are all circular, and the top ends of the positioning rods (7) are chamfered.

4. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 1, characterized in that: Two cover doors (9) are hingedly connected to one side of the housing (1), a controller (10) is provided on one side of one of the cover doors (9), a support frame (13) is installed on the top of the controller (10), and the housing (1) and the controller (10) are fixedly connected to the support frame (13).

5. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 1, characterized in that: The top end of the housing (1) is fixedly connected to a reinforcement shell (14), and a support column (15) is fixedly installed on the top end of the reinforcement shell (14); A plurality of bases (16) are fixedly mounted on the bottom end of the casing (1).

6. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 1, characterized in that: An outer pipe (11) is inserted into the outer wall of the casing (1), and a liquid inlet pipe (12) is fixedly installed at the rear of the casing (1); the liquid inlet pipe (12) and the outer pipe (11) are both connected to the casing (1).

7. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 1, characterized in that: The multi-point cooling temperature control mechanism comprises an L-shaped frame plate (17) fixedly arranged on one side of the support plate (6); The inner wall of the L-shaped frame plate (17) is rotatably connected with a linkage screw rod (18); a reduction motor (19) is fixedly installed on one side of the L-shaped frame plate (17); the reduction motor (19) is used to drive the linkage screw rod (18) to rotate; the outer wall of the linkage screw rod (18) is threadedly connected with a sleeve block (20), and the sleeve block (20) is slidably connected to the L-shaped frame plate (17); A sleeve bar (21) is welded to one side of the sleeve block (20), and two first temperature sensors (22) are fixedly mounted on the inner wall of the sleeve bar (21).

8. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 7, characterized in that: The outer wall of the sleeve block (20) and the inner wall of the L-shaped frame plate (17) are both smooth surfaces, and the vertical cross-section of the sleeve strip (21) is L-shaped.

9. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 1, characterized in that: The multi-point temperature control and heating mechanism comprises a linkage electric cylinder (23) fixedly arranged on the top end of the inner wall of the casing (1); A support plate (24) is fixedly mounted on the output end of the linkage electric cylinder (23); a support frame (25) is welded to the bottom end of the support plate (24); and a driving screw (26) is rotatably connected to the inner wall of the support frame (25); A linkage motor (27) is fixedly mounted on one end of the support frame (25); a threaded sleeve (28) is threadedly connected to the outer wall of the driving screw (26); sleeve strips (29) are fixedly mounted on both sides of the threaded sleeve (28); and a second temperature sensor (30) is fixedly mounted on the inner wall of each sleeve strip (29); A plurality of electromagnetic heaters (31) are fixedly mounted on both sides of the support frame (25).

10. The CNC machine tool for electromagnetic induction hardening of shaft parts according to claim 10, characterized in that: The output end of the linkage motor (27) is fixedly connected to the driving screw (26), and the linkage motor (27) is used to drive the driving screw (26) to rotate. The driving screw (26) is rotationally connected to the support frame (25).

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