CN112708703A

CN112708703A - Even tensile processor of leather raw leather material

Info

Publication number: CN112708703A
Application number: CN202110192980.XA
Authority: CN
Inventors: 李高
Original assignee: Beijing Haihong Yiqiang Trading Co ltd
Current assignee: Xuzhou Li Da Sewing Devices Manufacturing Co ltd
Priority date: 2021-02-20
Filing date: 2021-02-20
Publication date: 2021-04-27
Anticipated expiration: 2041-02-20
Also published as: CN112708703B

Abstract

The invention relates to the technical field of leather correlation, in particular to a uniform stretching manufacturing machine for leather leathers, which comprises an L-shaped shell and a table body, the L-shaped shell is fixedly arranged on the top surface of the table body, a power cavity with an opening facing the L-shaped shell is arranged in the table body, a lifting platform is arranged between the inner walls of the power cavity in a sliding way, leather materials can be placed on the top surface of the lifting platform, the bottom wall of the power cavity is provided with two thread blocks in a sliding way, and a jacking connecting rod is hinged between the thread blocks and the lifting platform, the lifting platform and the lifting column are controlled to lift simultaneously by a single motor, and the lifting mode is utilized to avoid the problem of manual operation safety of the traditional rolling conveying type stretching leather cloth, simultaneously, utilize the decline of lift post, can directly stretch towards four directions to the leather cladding, not only can compress tightly four end edges of tensile, can also assist the whole leather cladding of tensile on the route of center to edge.

Description

Even tensile processor of leather raw leather material

Technical Field

The invention relates to the field of leather correlation, in particular to a uniform stretching manufacturing machine for leather raw materials.

Background

The leather is in the manufacture process, wherein contain the tensile process to the leather skin material, in traditional handicraft, generally adopts manual operation, carries the leather skin material and gets into the rolling tensile gyro wheel bottom of machinery, utilizes the roof pressure of splint to realize the tensile effect of gyro wheel drive, and not only the security is lower, and is reducing at the tensile efficiency to whole leather, and tensile quality is very inhomogeneous more.

Disclosure of Invention

The invention provides a uniform stretching and manufacturing machine for leather hides, which aims to solve the technical problems.

The above object of the present invention is achieved by the following technical solutions: a leather raw leather uniform stretching manufacturing machine comprises an L-shaped shell and a table body, wherein the L-shaped shell is fixedly arranged on the top surface of the table body, a power cavity with an opening facing the L-shaped shell is arranged in the table body, a lifting table is arranged between the inner walls of the power cavity in a sliding manner, leather can be placed on the top surface of the lifting table, a lifting cavity with an opening facing the table body is arranged in the L-shaped shell, lifting columns are arranged between the inner walls of the lifting cavity in a sliding manner, the extending parts of the lifting columns extend out of the outside, a rotary table is arranged at the bottom end of each lifting column in a rotating manner, four rotating cavities with openings facing the lifting table and symmetrical to the center of the rotary table are arranged in the rotary table, a rotating shaft is arranged between the inner walls of the rotating cavities in a rotating manner, a sliding sleeve is fixedly arranged at the periphery of the rotating shaft, a sliding cavity with an opening facing the outside is arranged in the sliding, first bifurcated pole extension stretches out the external world, be equipped with four openings in the carousel towards the external world and with the carousel center is the spring chamber of symmetry, it is equipped with the power pole to rotate between the inner wall in spring chamber, the periphery of power pole has set firmly the second bifurcated pole, the second bifurcated pole extension stretches out the external world, the second bifurcated pole with the bifurcate that first bifurcated pole is located external part all rotates between being close to the side each other and is equipped with the cylinder, the periphery evenly distributed of cylinder has set firmly the damping ball, the damping ball with the cylinder homoenergetic with the leather cladding butt.

Preferably, the bottom wall of the power cavity is provided with two thread blocks in a sliding manner, and a jacking connecting rod is hinged between each thread block and the lifting platform.

Preferably, a transmission cavity is formed in the rotary disc, a sliding plate is arranged between the inner walls of the transmission cavity in a sliding mode, a positioning column is fixedly arranged on the bottom surface of the sliding plate, extends outwards towards the extension part on the table body side and can be abutted to the leather.

Preferably, a positioning spring is fixedly arranged between the bottom surface of the sliding plate and the bottom wall of the transmission cavity.

Preferably, the diapire fixed mounting in power chamber has motor power, motor power one side power connection is equipped with horizontal screw rod, horizontal screw rod extension runs through two the inner wall of screw thread piece, and with screw thread piece inner wall threaded connection, the chain chamber has been seted up in the L type casing, the diapire rotation in chain chamber is equipped with vertical axis and drive screw, the vertical axis with drive screw's top surface all has set firmly the chain wheel, two the transmission is connected between the chain wheel and is equipped with the chain, the vertical axis with the transmission is connected between the horizontal screw rod and is equipped with transmission bevel gear group, be equipped with the opening court in the lift post the screw thread chamber in chain chamber, drive screw is close to lift chamber side extension stretch into lift chamber with the screw thread intracavity, and with screw thread chamber inner wall threaded connection.

As preferred, the roof in chain chamber has set firmly clamping screw, the regulation chamber has been seted up to the downside in screw thread chamber, the roof in regulation chamber is rotated and is equipped with the regulation swivel nut, clamping screw downside extension runs through the chain wheel drive screw with the screw thread chamber, and stretch into adjust the intracavity, clamping screw with adjust swivel nut threaded connection, clamping screw with chain wheel gap junction, clamping screw with drive screw gap junction, the bottom surface of adjusting the swivel nut has set firmly the ratchet group, the diapire in regulation chamber rotates and is equipped with the driven shaft, the driven shaft with ratchet group power is connected, driven shaft downside extension runs through the inner wall of lift post, and with the top surface fixed connection of carousel.

Preferably, the upper side of the rotating cavity is communicated with a rack cavity, the rack cavity is communicated with the transmission cavity, a rack is arranged on the top wall of the rack cavity in a sliding mode, the extending part of the rack extends into the transmission cavity, a transmission connecting rod is hinged between the rack and the sliding plate, a connecting gear is arranged between the inner walls of the rotating cavity in a rotating mode, the connecting gear is meshed with the rotating gear, the extending part of the connecting gear extends into the rack cavity and is meshed with the rack, a jacking spring is fixedly installed between the top surface of the second forked rod and the top wall of the spring cavity, and a telescopic spring is fixedly installed between the inner walls of the first forked rod and the sliding cavity.

The invention has the beneficial effects that: the lifting platform and the lifting column are controlled to lift simultaneously by the single motor, the lifting mode is utilized, the problem of manual operation safety of the traditional rolling conveying type stretching leather cloth is solved, meanwhile, the leather can be directly stretched towards four directions by descending of the lifting column, not only can the four end edges be tightly pressed and stretched, but also the whole leather can be stretched in an auxiliary mode on a path from the center to the edge, and the rotating angle of the rotary table can be adjusted when the lifting column rises, so that the stretching operation efficiency of the whole leather by the needle is higher, and the quality is more uniform.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an enlarged schematic view of a in fig. 1.

Fig. 3 is an enlarged schematic view of B in fig. 1.

Fig. 4 is a bottom view of the structure of fig. 3.

In the figure: 11-L-shaped shell, 12-lifting cavity, 13-lifting column, 14-chain cavity, 15-chain, 16-vertical shaft, 17-table body, 18-transmission bevel gear set, 20-lifting platform, 21-top pressure connecting rod, 22-thread block, 23-transverse screw rod, 24-power cavity, 25-power motor, 26-leather material, 27-chain wheel, 28-transmission screw rod, 29-fixed screw rod, 30-thread cavity, 31-adjusting cavity, 32-adjusting screw sleeve, 33-ratchet set, 34-driven shaft, 35-rotating disc, 36-rack, 37-rack cavity, 38-rotating gear, 39-rotating cavity, 40-transmission cavity, 41-transmission connecting rod, 42-sliding sleeve and 43-rotating shaft, 44-top pressure spring, 45-spring cavity, 46-damping ball, 47-roller, 48-second fork rod, 49-power rod, 50-first fork rod, 51-positioning column, 52-positioning spring, 53-sliding plate, 54-sliding cavity, 55-expansion spring and 56-connecting gear.

Detailed Description

The present invention is described in further detail with reference to the accompanying fig. 1-4. The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

The invention relates to a uniform stretching manufacturing machine for leather leathers, which comprises an L-shaped shell 11 and a table body 17, wherein the L-shaped shell 11 is fixedly arranged on the top surface of the table body 17, and the uniform stretching manufacturing machine is characterized in that: the table body 17 is internally provided with a power cavity 24 with an opening facing the L-shaped shell 11, a lifting platform 20 is arranged between the inner walls of the power cavity 24 in a sliding manner, the top surface of the lifting platform 20 can be used for placing leather 26, the L-shaped shell 11 is internally provided with a lifting cavity 12 with an opening facing the table body 17, a lifting column 13 is arranged between the inner walls of the lifting cavity 12 in a sliding manner, the extending part of the lifting column 13 extends out of the outside, the bottom end of the lifting column 13 is rotatably provided with a turntable 35, the turntable 35 is internally provided with four openings facing the lifting platform 20 and a rotating cavity 39 with the center of the turntable 35 as the symmetry, a rotating shaft 43 is arranged between the inner walls of the rotating cavity 39 in a rotating manner, the periphery of the rotating shaft 43 is fixedly provided with a sliding sleeve 42, a sliding cavity 54 with an opening facing the outside is arranged in the sliding sleeve 42, a first branch rod 50 is arranged between the inner walls of the sliding cavity, be equipped with four openings in the carousel 35 towards the external world and with the spring chamber 45 of carousel 35 center for the symmetry, it is equipped with power rod 49 to rotate between the inner wall of spring chamber 45, power rod 49's periphery has set firmly second crotch bar 48, second crotch bar 48 extension stretches out the external world, second crotch bar 48 with first crotch bar 50 is located the bifurcate of external part and all rotates between being close to the side each other and is equipped with cylinder 47, cylinder 47's periphery evenly distributed has set firmly damping ball 46, damping ball 46 with cylinder 47 homoenergetic with leather cladding 26 butt.

Advantageously, the bottom wall of the power cavity 24 is slidably provided with two thread blocks 22, and a jacking connecting rod 21 is hinged between the thread blocks 22 and the lifting platform 20.

Advantageously, a transmission cavity 40 is formed in the rotating disc 35, a sliding plate 53 is slidably disposed between inner walls of the transmission cavity 40, a positioning column 51 is fixedly disposed on a bottom surface of the sliding plate 53, and an extension of the positioning column 51 towards the table body 17 extends to the outside and can abut against the leather 26.

Advantageously, a positioning spring 52 is fixedly installed between the bottom surface of the sliding plate 53 and the bottom wall of the transmission chamber 40, the positioning spring 52 can make the positioning column 51 always in a downward pressing state, when the leather material 26 is not placed, the positioning column 51 is abutted against the lifting table 20, and when the leather material 26 is manually placed, the positioning column 51 can be made to press and position the center position of the leather material 26.

Beneficially, a power motor 25 is fixedly mounted on the bottom wall of the power cavity 24, a transverse screw 23 is disposed in a power connection at one side of the power motor 25, an extending portion of the transverse screw 23 penetrates through the inner walls of the two screw blocks 22 and is in threaded connection with the inner walls of the screw blocks 22, a chain cavity 14 is disposed in the L-shaped housing 11, a vertical shaft 16 and a transmission screw 28 are rotatably disposed on the bottom wall of the chain cavity 14, chain wheels 27 are fixedly disposed on the top surfaces of the vertical shaft 16 and the transmission screw 28, a chain 15 is disposed in a transmission connection between the two chain wheels 27, a transmission bevel gear set 18 is disposed in a transmission connection between the vertical shaft 16 and the transverse screw 23, a threaded cavity 30 with an opening facing the chain cavity 14 is disposed in the lifting column 13, a portion of the transmission screw 28, which is close to the side of the lifting cavity 12, extends into the lifting cavity 12 and the threaded cavity 30, and is connected with the threaded cavity 30 inner wall screw thread, after the leather cladding 26 is put, through the forward start the power motor 25, can make the horizontal screw 23 drive the screw block 22 and the roof pressure connecting rod 21 jack up the elevating platform 20, at the same time, the horizontal screw 23 can make the vertical axis 16 rotate forward through the transmission bevel gear set 18, thus can drive the transmission screw 28 to rotate forward through the chain 15 and the chain wheel 27, and then can make the lifting column 13 drive the rotary table 35 to approach to the leather cladding 26, can make the damping ball 46 and the cylinder 47 butt against the surface of the leather cladding 26 at this moment, when the power motor 25 rotates backward, can make the rotary table 35 rise and reset, and the elevating platform 20 descends and resets.

Advantageously, a fixed screw 29 is fixedly arranged on the top wall of the chain cavity 14, an adjusting cavity 31 is formed on the lower side of the threaded cavity 30, an adjusting threaded sleeve 32 is rotatably arranged on the top wall of the adjusting cavity 31, an extending portion of the lower side of the fixed screw 29 penetrates through the chain wheel 27, the transmission screw 28 and the threaded cavity 30 and extends into the adjusting cavity 31, the fixed screw 29 is in threaded connection with the adjusting threaded sleeve 32, the fixed screw 29 is in clearance connection with the chain wheel 27, the fixed screw 29 is in clearance connection with the transmission screw 28, a ratchet set 33 is fixedly arranged on the bottom surface of the adjusting threaded sleeve 32, a driven shaft 34 is rotatably arranged on the bottom wall of the adjusting cavity 31, the driven shaft 34 is in power connection with the ratchet set 33, an extending portion of the lower side of the driven shaft 34 penetrates through the inner wall of the lifting column 13 and is fixedly connected with the top surface of the rotary table 35, when the transmission screw 28 rotates forwards, the lifting column 13 descends, so that the fixed screw 29 drives the adjusting screw sleeve 32 to rotate forwards, the ratchet group 33 is fixed, when the transmission screw 28 rotates backwards and the lifting column 13 ascends, the fixed screw 29 drives the adjusting screw sleeve 32 to rotate backwards, and at this time, the driven shaft 34 drives the rotating disc 35 to rotate backwards by a certain angle, so that the eight rollers 47 can be adjusted to different angular positions.

Advantageously, a rack chamber 37 is provided on the upper side of the rotary chamber 39, four rack chambers 37 are communicated with the transmission chamber 40, a rack 36 is slidably provided on the top wall of the rack chamber 37, an extension portion of the rack 36 extends into the transmission chamber 40, a transmission link 41 is provided between the rack chamber and the sliding plate 53, a connecting gear 56 is rotatably provided between the inner walls of the rotary chamber 39, the connecting gear 56 is engaged with the rotary gear 38, an extension portion of the connecting gear 56 extends into the rack chamber 37 and is engaged with the rack 36, a pressing spring 44 is fixedly provided between the top surface of the second diverging bar 48 and the top wall of the spring chamber 45, a telescopic spring 55 is fixedly provided between the first diverging bar 50 and the inner wall of the sliding chamber 54, when the rotary table 35 descends, the roller 47 mounted on the second diverging bar 48 can be abutted against the edges of the leather hide 26 in four directions, at this time, the rotating disc 35 is continuously lowered to make the roller 47 and the damping ball 46 located on the upper side of the second diverging bar 48 stretch the leather material 26 in four directions, and at the same time, when the rotating disc 35 is lowered, the positioning column 51 can drive the sliding plate 53 to be raised relative to the rotating disc 35, at this time, the four racks 36 can be driven to move into the rack chamber 37 through the transmission link 41, so that the rack 36 can drive the connecting gear 56 to rotate forward, the connecting gear 56 can drive the rotating gear 38 to rotate backward, so that the rotating shaft 43 can drive the sliding sleeve 42 and the first diverging bar 50 to rotate away from the center of the leather material 26, so that the damping ball 46 and the roller 47 located on the upper side of the first diverging bar 50 can roll and stretch the leather material 26 in the direction of the second diverging bar 48, the cloth components inside the leather material 26 are completely stretched and unfolded, and the method is repeatedly operated, so that when the rotary disc 35 is adjusted to different angles, the damping ball 46 and the roller 47 are controlled to stretch the leather material 26 in all directions.

The following describes in detail the use steps of a leather hide uniform stretching machine according to the present disclosure with reference to fig. 1 to 4:

in the initial state, the top pressure spring 44 and the extension spring 55 are in a relaxed state, the turntable 35 and the lifting column 13 are in a raised state, the sliding plate 53 is positioned on the inner bottom side of the transmission cavity 40, the positioning column 51 is abutted against the top surface of the lifting table 20, and the lifting table 20 is positioned in the power cavity 24.

When the leather material lifting device is used, the positioning column 51 can be always in a downward pressing state through the positioning spring 52, when the leather material 26 is not placed, the positioning column 51 is abutted with the lifting platform 20, when the leather material 26 is placed manually, the positioning column 51 can be pressed and positioned at the central position of the leather material 26, after the leather material 26 is placed completely, the transverse screw 23 can drive the thread block 22 and the pressing connecting rod 21 to jack the lifting platform 20 through the forward starting of the power motor 25, meanwhile, the transverse screw 23 can drive the vertical shaft 16 to rotate forwards through the transmission bevel gear set 18, so that the transmission screw 28 can be driven to rotate forwards through the chain 15 and the chain wheel 27, the lifting column 13 can drive the rotary plate 35 to approach the leather material 26, at the moment, the damping ball 46 and the roller 47 can be abutted against the surface of the leather material 26, when the power motor 25 rotates backwards, the rotary plate 35 can be lifted and reset, and the lifting platform 20 is lowered and reset, when the transmission screw 28 rotates forwards, the lifting column 13 descends, so that the fixed screw 29 drives the adjusting screw 32 to rotate forwards, the ratchet group 33 is not moved, when the transmission screw 28 rotates backwards and the lifting column 13 ascends, the fixed screw 29 drives the adjusting screw 32 to rotate backwards, at this time, the driven shaft 34 drives the rotating disc 35 to rotate backwards for a certain angle, so that the eight rollers 47 can be adjusted to different angle positions, when the rotating disc 35 descends, the rollers 47 arranged on the second fork rod 48 can be abutted against the edges of the leather 26 in four directions, at this time, the rotating disc 35 descends continuously, the rollers 47 and the damping balls 46 arranged on the second fork rod 48 can stretch the leather 26 in four directions, at the same time, when the rotating disc 35 descends, the positioning column 51 can drive the sliding plate 53 to ascend relative to the rotating disc 35, at this time, the four racks 36 can be driven to move towards the rack cavity 37 through the transmission connecting rod 41, the rack 36 can drive the connecting gear 56 to rotate forward, and simultaneously the connecting gear 56 can drive the rotating gear 38 to rotate backward, and then the rotating shaft 43 can drive the sliding sleeve 42 and the first forked rod 50 to rotate towards the side far away from the center of the leather material 26, so that the damping ball 46 and the roller 47 positioned on the upper side of the first forked rod 50 can roll towards the second forked rod 48 to stretch the leather material 26, and the cloth components in the leather material 26 can be completely stretched and unfolded, and the method is repeatedly operated, so that when the turntable 35 is adjusted to different angles, the damping ball 46 and the roller 47 are controlled to stretch the leather material 26 in all directions.

Claims

1. The utility model provides an even tensile processor of leather leatherette, includes L type casing (11) and the table body (17), L type casing (11) set firmly the top surface of the table body (17), its characterized in that: be equipped with the opening court power chamber (24) of L type casing (11) in the table body (17), it is equipped with elevating platform (20) to slide between the inner wall in power chamber (24), leather cladding (26) can be placed to elevating platform (20) top surface, be equipped with the opening court in L type casing (11) lift chamber (12) of the table body (17), it is equipped with lift post (13) to slide between the inner wall in lift chamber (12), lift post (13) extension stretches out the external world, the bottom of lift post (13) is rotated and is equipped with carousel (35), it has four openings court to open in carousel (35) elevating platform (20) and with carousel (35) center is rotatory chamber (39) of symmetry, it is equipped with rotation axis (43) to rotate between the inner wall in rotatory chamber (39), the periphery of rotation axis (43) has set firmly sliding sleeve (42), open towards external slip chamber (54) is seted up in sliding sleeve (42), slide between the inner wall of slip chamber (54) and be equipped with first forked lever (50), first forked lever (50) extension stretches out the external world, be equipped with four openings in carousel (35) towards the external world and with carousel (35) center is spring chamber (45) of symmetry, rotate between the inner wall of spring chamber (45) and be equipped with power rod (49), the periphery of power rod (49) has set firmly second forked lever (48), second forked lever (48) extension stretches out the external world, second forked lever (48) with first forked lever (50) are located all to rotate between the side each other near the bifurcate of external part and are equipped with cylinder (47), the periphery evenly distributed of cylinder (47) has set firmly damping ball (46), damping ball (46) with cylinder (47) homoenergetic with leather material (26) butt.

2. The uniform stretching machine for leather hides of claim 1, characterized in that: the bottom wall of the power cavity (24) is provided with two thread blocks (22) in a sliding manner, and a jacking connecting rod (21) is hinged between each thread block (22) and the lifting platform (20).

3. The uniform stretching machine for leather hides of claim 1, characterized in that: drive chamber (40) have been seted up in carousel (35), the sliding plate (53) are equipped with in the sliding between the inner wall in drive chamber (40), the bottom surface of sliding plate (53) has set firmly reference column (51), reference column (51) to the extension portion extends the external world on table body (17) side, and can with leather cladding (26) butt.

4. The uniform stretching machine for leather hides of claim 1, characterized in that: and a positioning spring (52) is fixedly arranged between the bottom surface of the sliding plate (53) and the bottom wall of the transmission cavity (40).

5. The uniform stretching machine for leather hides of claim 2, characterized in that: the bottom wall of the power cavity (24) is fixedly provided with a power motor (25), one side of the power motor (25) is provided with a transverse screw rod (23) in a power connection mode, the extending part of the transverse screw rod (23) penetrates through the inner walls of the two thread blocks (22) and is in threaded connection with the inner walls of the thread blocks (22), chain cavities (14) are formed in the L-shaped shell (11), the bottom wall of each chain cavity (14) is provided with a vertical shaft (16) and a transmission screw rod (28) in a rotating mode, the top surfaces of the vertical shaft (16) and the transmission screw rod (28) are fixedly provided with chain wheels (27), a chain (15) is arranged between the two chain wheels (27) in a transmission connection mode, a transmission bevel gear set (18) is arranged between the vertical shaft (16) and the transverse screw rod (23) in a transmission connection mode, a thread cavity (30) with an opening towards the chain cavity (14) is arranged in the lifting column (, the driving screw (28) extends into the lifting cavity (12) and the thread cavity (30) near the side extension of the lifting cavity (12) and is in threaded connection with the inner wall of the thread cavity (30).

6. The uniform stretching machine for leather hides of claim 5, characterized in that: the roof in chain chamber (14) has set firmly clamping screw (29), regulation chamber (31) have been seted up to the downside in screw thread chamber (30), the roof of adjusting chamber (31) is rotated and is equipped with regulation swivel nut (32), clamping screw (29) downside extension runs through chain wheel (27), drive screw (28) with screw thread chamber (30) to stretch into in adjusting chamber (31), clamping screw (29) with adjust swivel nut (32) threaded connection, clamping screw (29) with chain wheel (27) gap junction, clamping screw (29) with drive screw (28) gap junction, the bottom surface of adjusting swivel nut (32) has set firmly ratchet group (33), the diapire of adjusting chamber (31) is rotated and is equipped with driven shaft (34), driven shaft (34) with ratchet group (33) power connection, the lower extending part of the driven shaft (34) penetrates through the inner wall of the lifting column (13) and is fixedly connected with the top surface of the rotary disc (35).

7. The uniform stretching machine for leather hides of claim 6, characterized in that: the upper side of the rotating cavity (39) is communicated with a rack cavity (37), the four rack cavities (37) are communicated with the transmission cavity (40), the top wall of the rack cavity (37) is provided with a rack (36) in a sliding way, the extension part of the rack (36) extends into the transmission cavity (40), a transmission connecting rod (41) is hinged between the sliding plate (53) and the rotating cavity (39), a connecting gear (56) is rotatably arranged between the inner walls of the rotating cavity (39), the connecting gear (56) is meshed with the rotating gear (38), the extending part of the connecting gear (56) extends into the rack cavity (37), and is meshed with the rack (36), a jacking spring (44) is fixedly arranged between the top surface of the second forked rod (48) and the top wall of the spring cavity (45), and a telescopic spring (55) is fixedly arranged between the first fork rod (50) and the inner wall of the sliding cavity (54).