A sandblasting equipment for precision parts processing

Abstract

The invention discloses a sandblasting device for precision parts processing, comprising a sandblasting box, wherein a plurality of support plates are fixedly connected to the bottom of the sandblasting box, a fixed base is fixedly connected to the bottom of the support plates, a storage cavity is arranged between the support plates, the storage cavity is fixedly connected to the bottom of the sandblasting box, a pair of circular holes are opened on the surface of the sandblasting box, and connecting rings are fixedly connected to the circular holes, the connecting rings are symmetrically arranged, an observation mirror is fixedly connected to the surface of the sandblasting box, the observation mirror is located directly above the connecting ring, a fixed cover is fixedly connected to the top of the sandblasting box, and a hinged cover is hingedly connected to the fixed cover; compared with the prior art, the invention starts to rotate through a transmission roller, so that the surface of the transmission rod and the elastic plate can be rubbed against each other, the elastic plate can be deformed, and the flow can be guided, so that the rust removal particles and metal chips accumulated on the surface of the elastic plate enter the interior of the fixed groove, and can be discharged quantitatively to avoid flying in the sandblasting box and affecting the sight of the operator.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a sandblasting device for precision parts processing. Background Art

[0002] The sand blasting machine uses compressed air to transport powdered granular materials from one place to another in a pipeline. In the process of converting kinetic energy into potential energy, the high-speed moving sand particles scour the surface of the object, thereby improving the surface quality of the object.

[0003] The sandblasting process removes the oxide scale in the inner cavity, and also removes impurities such as oil, iron filings, etc. in the inner cavity, thereby improving the cleanliness, strength and roughness of the inner cavity. However, as the equipment sandblasts the metal surface, metal impurities will be mixed into the internal particles, which will affect the operator's line of sight during the sandblasting process. It is easy for rust to not be completely removed during the sandblasting process, which will affect the use of the equipment. For this reason, we propose a sandblasting equipment for precision parts processing to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a sandblasting device for precision parts processing to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sandblasting device for precision parts processing, comprising a sandblasting box, a plurality of support plates are fixedly connected to the bottom of the sandblasting box, a fixed base is fixedly connected to the bottom of the support plates, a storage cavity is provided between the support plates, the storage cavity is fixedly connected to the bottom of the sandblasting box, a pair of circular holes are opened on the surface of the sandblasting box, and connecting rings are fixedly connected to the circular holes, the connecting rings are symmetrically arranged, an observation mirror is fixedly connected to the surface of the sandblasting box, and the observation mirror is located directly above the connecting ring;

[0006] A fixed cover is fixedly connected to the top of the sandblasting box, a hinged cover is hinged on the fixed cover, a fixed tube is fixedly connected to the surface of the sandblasting box, one end of the fixed tube is fixedly connected to the storage chamber, and the parts that need to be derusted and sandblasted are placed inside the sandblasting box. With the operation of the air compressor, the rust removal particles inside can begin to grind the surface of the parts, so the parts can be quickly derusted.

[0007] Preferably, a fixed plate and a pair of fixed sieve plates are fixedly connected to the inner wall of the sandblasting box, the fixed plate is located directly above the fixed sieve plates, a transmission roller is provided between the fixed sieve plates, a compression sleeve is fixedly connected inside the transmission roller, the compression sleeve is made of elastic material, a hinge shaft is fixedly connected inside the compression sleeve, and the hinge shaft is rotatably arranged inside the sandblasting box;

[0008] An air compressor is fixedly connected to the side wall of the sandblasting box, one end of the air compressor is fixedly connected to a fixed pipe, one end of the air compressor is fixedly connected to a connecting hose, and a pair of ends of the connecting hose are fixedly connected to a movable spray gun. The rust removal particles can be screened under the action of the fixed screen plate and the transmission roller to avoid excessive metal debris mixing in the rust removal particles, and blockage in the fixed pipe and the connecting hose can be avoided, thereby extending the service life of the equipment.

[0009] Preferably, a rectangular groove is provided inside the fixed plate, and a pair of elastic plates are fixedly connected to the inner wall of the rectangular groove, one end of the elastic plate abuts against the surface of the transmission roller, and a plurality of arc grooves are provided at one end of the elastic plate close to the transmission roller, and the arc grooves are evenly arrayed on the surface of the elastic plate;

[0010] A curved plate is fixedly connected to one side of the fixed plate away from the connecting ring, and one end of the curved plate is fixedly connected to the inner wall of the sandblasting box. The curved plate can play a role in guiding flow and prevent rust removal particles from being stuck on the surface of the fixed plate.

[0011] Preferably, a plurality of connecting rods are fixedly connected to the bottom of the elastic plate, the connecting rods are in an "L" shape, a rubber ball is fixedly connected to the surface of the connecting rod, the surface of the rubber ball abuts against the surface of the transmission roller, and a plurality of annular grooves are opened at one end of the connecting rod;

[0012] A plurality of friction tubes are fixedly connected to the bottom of the fixed plate. The friction tubes are arranged in a uniform array at the bottom of the fixed plate. A rubber sleeve is fixedly connected to the inner wall of the friction tube, and the inner wall of the rubber sleeve abuts against the inner wall of the annular groove. The metal ball on the surface of the transmission rod can rub against the rubber ball, which can drive the connecting rod to deform, and one end of the connecting rod can move inside the friction tube, so that the connecting rod and the friction tube rub against each other, which can enhance the swinging effect of the elastic plate and avoid impurities such as metal debris remaining on the surface of the elastic plate.

[0013] Preferably, the fixed screen plate is magnetic, a compression plate is fixedly connected to the side wall of the fixed screen plate, a plurality of transmission shafts are fixedly connected to the surface of the compression plate, the transmission shaft is "U" shaped, a plurality of elastic shafts are fixedly connected to the bottom of the transmission shaft, and a counterweight ball is fixedly connected to the bottom of the elastic shaft;

[0014] A plurality of limiting tubes are fixedly connected to the surface of the fixed screen plate, and the elastic shaft is movably arranged inside the limiting tube. After the surface of the transmission rod is squeezed, the extrusion plate can be deformed under the action of the metal sheet, and the extrusion plate can shake along with the transmission rod, thereby separating metal debris and rust removal particles to play a role of pretreatment. At the same time, large pieces of metal debris can be crushed to avoid accumulation on the surface of the fixed screen plate and causing blockage inside the equipment.

[0015] Preferably, a pair of straight grooves are provided on the surface of the limiting tube, and a compression shaft is movably provided on the straight groove, a friction ring is fixedly connected to the top of the compression shaft, and the friction ring is made of rubber. A plurality of rubber rings are fixedly connected to the inner wall of the limiting tube, and the inner wall of the rubber ring is against the surface of the elastic shaft. The surface of the compression plate can be squeezed by the transmission roller, so that the compression plate can drive the transmission shaft to move, and the elastic shaft can move. The counterweight ball can collide with the bottom of the fixed screen plate, so as to reduce the blockage of the fixed screen plate and ensure the impurity removal efficiency of the equipment.

[0016] Preferably, a plurality of fixed grooves are provided on the surface of the driving roller, a plurality of extrusion plates are fixedly connected to the inner wall of the fixed groove, the extrusion plates are symmetrically arranged, a metal sheet is fixedly connected to the extrusion plate, a driving rod is fixedly connected to the metal sheet, and the metal debris and rust removal particles passing through the fixed grooves are poured onto the surface of the fixed screen plate, and the elasticity of the fixed screen plate itself can absorb the metal debris to avoid mixing into the rust removal particles in large quantities, thereby extending the maintenance period of the equipment and having good economic benefits;

[0017] A plurality of metal balls are fixedly connected to the surface of the transmission rod. The metal balls are located between the metal sheets and start to rotate through the transmission roller, so that the surface of the transmission rod and the elastic plate can rub against each other, which can cause the elastic plate to deform and play a role in guiding flow, so that the rust removal particles and metal chips accumulated on the surface of the elastic plate enter the fixed groove and can be discharged quantitatively to prevent them from flying in the sandblasting box and affecting the operator's line of sight.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention starts to rotate through the transmission roller, which can make the surface of the transmission rod and the elastic plate rub against each other, can make the elastic plate deform, can play a role of diversion, and make the rust removal particles and metal chips accumulated on the surface of the elastic plate enter the fixed groove, and can be quantitatively discharged to avoid flying in the sandblasting box and affecting the sight of the operator;

[0020] 2. After the surface of the transmission rod is squeezed, the present invention can cause the extrusion plate to deform under the action of the metal sheet, and can cause the extrusion plate to shake along with the transmission rod, so as to separate metal debris and rust removal particles, thus playing a role of pretreatment. At the same time, large pieces of metal debris can be crushed to avoid accumulation on the surface of the fixed screen plate, which may cause blockage inside the equipment.

[0021] 3. The metal ball on the surface of the transmission rod can rub against the rubber ball, which can drive the connecting rod to deform, and make one end of the connecting rod move inside the friction tube, so that the connecting rod and the friction tube rub against each other, which can enhance the swing effect of the elastic plate and prevent impurities such as metal debris from remaining on the surface of the elastic plate;

[0022] 4. The present invention pours the metal debris and rust removal particles in the fixed groove onto the surface of the fixed screen plate. The elasticity of the fixed screen plate can absorb the metal debris to avoid mixing with the rust removal particles in large quantities, thereby extending the maintenance period of the equipment and having good economic benefits.

[0023] 5. The present invention can squeeze the surface of the compression plate through the transmission roller, so that the compression plate can drive the transmission shaft to move, and the elastic shaft can move. The counterweight ball can collide with the bottom of the fixed screen plate, which can reduce the blockage of the fixed screen plate and ensure the impurity removal efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the sandblasting box of the present invention;

[0026] Figure 3 This is a schematic diagram of the fixing plate structure of the present invention;

[0027] Figure 4 For the present invention Figure 3 A partial enlarged schematic diagram in the middle;

[0028] Figure 5 It is a schematic diagram of the structure of the transmission roller of the present invention;

[0029] Figure 6 For the present invention Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0030] Figure 7 This is a schematic diagram of the fixed screen plate structure of the present invention;

[0031] Figure 8 It is a cross-sectional schematic diagram of the limit tube structure of the present invention;

[0032] In the figure: 1, sandblasting box; 2, fixed cover; 3, air compressor; 4, fixed plate; 5, fixed screen plate; 6, transmission roller; 11, fixed base; 12, support plate; 13, connecting ring; 14, observation mirror; 15, storage chamber; 16, fixed tube; 21, hinged cover; 31, movable spray gun; 41, elastic plate; 42, arc plate; 43, arc groove; 44, friction tube; 45, connecting rod; 451, rubber ball; 51, compression plate; 52, transmission shaft; 53, limit tube; 531, friction ring; 532, compression shaft; 533, rubber ring; 54, elastic shaft; 541, counterweight ball; 61, hinged shaft; 611, compression sleeve; 62, fixed groove; 63, extrusion plate; 64, transmission rod; 641, metal ball; 65, metal sheet. DETAILED DESCRIPTION

[0033] 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.

[0034] See also Figure 1-8 The present invention provides a technical solution: a sandblasting device for precision parts processing, comprising a sandblasting box 1, a plurality of support plates 12 are fixedly connected to the bottom of the sandblasting box 1, a fixed base 11 is fixedly connected to the bottom of the support plate 12, a storage cavity 15 is provided between the support plates 12, the storage cavity 15 is fixedly connected to the bottom of the sandblasting box 1, a pair of circular holes are opened on the surface of the sandblasting box 1, and a connecting ring 13 is fixedly connected to the circular hole, the connecting ring 13 is symmetrically arranged, an observation mirror 14 is fixedly connected to the surface of the sandblasting box 1, and the observation mirror 14 is located directly above the connecting ring 13;

[0035] A fixed cover 2 is fixedly connected to the top of the sandblasting box 1, and a hinged cover 21 is hinged on the fixed cover 2. A fixed tube 16 is fixedly connected to the surface of the sandblasting box 1, and one end of the fixed tube 16 is fixedly connected to the storage chamber 15. The parts that need to be derusted and sandblasted are placed inside the sandblasting box 1. With the operation of the air compressor 3, the rust-removing particles inside can begin to grind the surface of the parts, so that the parts can be quickly derusted.

[0036] A fixed plate 4 and a pair of fixed sieve plates 5 are fixedly connected to the inner wall of the sandblasting box 1. The fixed plate 4 is located directly above the fixed sieve plates 5. A transmission roller 6 is provided between the fixed sieve plates 5. A compression sleeve 611 is fixedly connected inside the transmission roller 6. The compression sleeve 611 is made of elastic material. A hinge shaft 61 is fixedly connected inside the compression sleeve 611. The hinge shaft 61 is rotatably arranged inside the sandblasting box 1.

[0037] An air compressor 3 is fixedly connected to the side wall of the sandblasting box 1, one end of the air compressor 3 is fixedly connected to the fixed pipe 16, one end of the air compressor 3 is fixedly connected to a connecting hose, and a pair of ends of the connecting hose are fixedly connected to a movable spray gun 31. The rust removal particles can be screened under the action of the fixed screen plate 5 and the transmission roller 6 to avoid excessive metal debris mixing in the rust removal particles, and to avoid blockage between the fixed pipe 16 and the connecting hose, thereby extending the service life of the equipment.

[0038] A rectangular groove is formed inside the fixed plate 4, and a pair of elastic plates 41 are fixedly connected to the inner wall of the rectangular groove. One end of the elastic plate 41 abuts against the surface of the transmission roller 6. A plurality of arc grooves 43 are formed on the end of the elastic plate 41 close to the transmission roller 6. The arc grooves 43 are evenly arrayed on the surface of the elastic plate 41.

[0039] A curved plate 42 is fixedly connected to one side of the fixing plate 4 away from the connecting ring 13 , and one end of the curved plate 42 is fixedly connected to the inner wall of the sandblasting box 1 . The curved plate 42 can play a role in guiding flow and prevent rust removal particles from getting stuck on the surface of the fixing plate 4 .

[0040] A plurality of connecting rods 45 are fixedly connected to the bottom of the elastic plate 41. The connecting rods 45 are in an "L" shape. A rubber ball 451 is fixedly connected to the surface of the connecting rod 45. The surface of the rubber ball 451 abuts against the surface of the driving roller 6. A plurality of annular grooves are opened at one end of the connecting rod 45.

[0041] A plurality of friction tubes 44 are fixedly connected to the bottom of the fixed plate 4. The friction tubes 44 are arranged in a uniform array at the bottom of the fixed plate 4. A rubber sleeve is fixedly connected to the inner wall of the friction tube 44, and the inner wall of the rubber sleeve is against the inner wall of the annular groove. The metal ball 641 on the surface of the transmission rod 64 can rub against the rubber ball 451, which can drive the connecting rod 45 to deform, and can make one end of the connecting rod 45 move inside the friction tube 44, so that the connecting rod 45 and the friction tube 44 rub against each other.

[0042] The fixed screen plate 5 is magnetic, and a compression plate 51 is fixedly connected to the side wall of the fixed screen plate 5. A plurality of transmission shafts 52 are fixedly connected to the surface of the compression plate 51. The transmission shaft 52 is "U"-shaped, and a plurality of elastic shafts 54 are fixedly connected to the bottom of the transmission shaft 52. A counterweight ball 541 is fixedly connected to the bottom of the elastic shaft 54.

[0043] A plurality of limiting tubes 53 are fixedly connected to the surface of the fixed screen plate 5, and the elastic shaft 54 ​​is movably arranged inside the limiting tube 53. When the surface of the transmission rod 64 is squeezed, the squeezing plate 63 can be deformed under the action of the metal sheet 65, and the squeezing plate 63 can shake along with the transmission rod 64, so that the metal debris and the rust removal particles can be separated, which plays a role of pretreatment, and at the same time, large pieces of metal debris can be crushed.

[0044] A pair of straight grooves are provided on the surface of the limiting tube 53, and a compression shaft 532 is movably provided on the straight groove. A friction ring 531 is fixedly connected to the top of the compression shaft 532, and the friction ring 531 is made of rubber. A plurality of rubber rings 533 are fixedly connected to the inner wall of the limiting tube 53, and the inner wall of the rubber ring 533 is against the surface of the elastic shaft 54. The surface of the compression plate 51 can be squeezed by the transmission roller 6, so that the compression plate 51 can drive the transmission shaft 52 to move, and the elastic shaft 54 ​​can move, and the counterweight ball 541 can collide with the bottom of the fixed screen plate 5.

[0045] A plurality of fixed grooves 62 are provided on the surface of the driving roller 6, and a plurality of extrusion plates 63 are fixedly connected to the inner wall of the fixed groove 62, and the extrusion plates 63 are symmetrically arranged, and a metal sheet 65 is fixedly connected to the extrusion plate 63, and a driving rod 64 is fixedly connected to the metal sheet 65. The metal debris and rust removal particles passing through the fixed groove 62 are poured onto the surface of the fixed sieve plate 5, and the elasticity of the fixed sieve plate 5 itself can absorb the metal debris to prevent it from being mixed into the rust removal particles in large quantities;

[0046] A plurality of metal balls 641 are fixedly connected to the surface of the transmission rod 64. The metal balls 641 are located between the metal sheets 65. When the transmission roller 6 starts to rotate, the surface of the transmission rod 64 and the elastic plate 41 can rub against each other, causing the elastic plate 41 to deform, thereby playing a role in guiding flow, so that the rust removal particles and metal chips accumulated on the surface of the elastic plate 41 enter the fixed groove 62 and can be discharged in a quantitative manner.

[0047] Working principle: firstly, the parts that need to be derusted and sandblasted are placed in the sandblasting box 1. With the operation of the air compressor 3, the rust removal particles inside can begin to grind the surface of the parts, so that the parts can be quickly derusted. The rust removal particles can be screened under the action of the fixed screen plate 5 and the transmission roller 6 to avoid excessive metal debris mixed in the rust removal particles, to avoid blockage in the fixed pipe 16 and the connecting hose, and to extend the service life of the equipment. As the transmission roller 6 starts to rotate, the surface of the transmission rod 64 and the elastic plate 41 can rub against each other, so that the elastic plate 41 can be deformed, which can play a role in guiding, so that the rust removal particles and metal chips accumulated on the surface of the elastic plate 41 enter the fixed groove 62, and can be discharged quantitatively to avoid flying in the sandblasting box 1 and affecting the operator's line of sight.

[0048] Then, after the surface of the transmission rod 64 is squeezed, the extrusion plate 63 can be deformed under the action of the metal sheet 65, and the extrusion plate 63 can be shaken following the transmission rod 64, so that the metal debris and the rust removal particles can be separated, which plays a role of pretreatment. At the same time, the large pieces of metal debris can be crushed to avoid accumulation on the surface of the fixed screen plate 5 and causing blockage inside the equipment. As the metal ball 641 on the surface of the transmission rod 64 and the rubber ball 451 rub against each other, the connecting rod 45 can be deformed, and one end of the connecting rod 45 can move inside the friction tube 44, so that the connecting rod 45 and the friction tube 44 rub against each other, which can enhance the swinging effect of the elastic plate 41 and avoid impurities such as metal debris remaining on the surface of the elastic plate 41.

[0049] Finally, the metal debris and rust removal particles accumulated in the fixed groove 62 are dumped onto the surface of the fixed screen plate 5. The elasticity of the fixed screen plate 5 itself can absorb the metal debris to avoid mixing in a large amount of rust removal particles, which can extend the maintenance cycle of the equipment and has good economic benefits. Under the action of the transmission roller 6, the surface of the compression plate 51 can be squeezed, and the compression plate 51 can drive the transmission shaft 52 to move, and the elastic shaft 54 ​​can move. The counterweight ball 541 can collide with the bottom of the fixed screen plate 5, which can reduce the blockage of the fixed screen plate 5 and ensure the impurity removal efficiency of the equipment.

[0050] 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 sandblasting device for precision parts processing, comprising a sandblasting box (1), characterized in that: A plurality of support plates (12) are fixedly connected to the bottom of the sandblasting box (1), a fixed base (11) is fixedly connected to the bottom of the support plates (12), a storage cavity (15) is provided between the support plates (12), the storage cavity (15) is fixedly connected to the bottom of the sandblasting box (1), a pair of circular holes are opened on the surface of the sandblasting box (1), and connecting rings (13) are fixedly connected to the circular holes, the connecting rings (13) are symmetrically arranged, an observation mirror (14) is fixedly connected to the surface of the sandblasting box (1), and the observation mirror (14) is located directly above the connecting ring (13); The top of the sandblasting box (1) is fixedly connected with a fixed cover (2), the fixed cover (2) is hinged with a hinged cover (21), the surface of the sandblasting box (1) is fixedly connected with a fixed pipe (16), one end of the fixed pipe (16) is fixedly connected with the storage chamber (15); A fixed plate (4) and a pair of fixed sieve plates (5) are fixedly connected to the inner wall of the sandblasting box (1), the fixed plate (4) is located directly above the fixed sieve plates (5), a transmission roller (6) is provided between the fixed sieve plates (5), a compression sleeve (611) is fixedly connected inside the transmission roller (6), the compression sleeve (611) is made of elastic material, a hinge shaft (61) is fixedly connected inside the compression sleeve (611), and the hinge shaft (61) is rotatably arranged inside the sandblasting box (1); An air compressor (3) is fixedly connected to the side wall of the sandblasting box (1), one end of the air compressor (3) is fixedly connected to a fixed pipe (16), one end of the air compressor (3) is fixedly connected to a connecting hose, and a pair of ends of the connecting hose are fixedly connected to a movable spray gun (31); A rectangular groove is provided inside the fixed plate (4), and a pair of elastic plates (41) are fixedly connected to the inner wall of the rectangular groove, one end of the elastic plate (41) is against the surface of the transmission roller (6), and a plurality of arc grooves (43) are provided at one end of the elastic plate (41) close to the transmission roller (6), and the arc grooves (43) are evenly arranged in an array on the surface of the elastic plate (41); A curved plate (42) is fixedly connected to one side of the fixed plate (4) away from the connecting ring (13), and one end of the curved plate (42) is fixedly connected to the inner wall of the sandblasting box (1); A plurality of connecting rods (45) are fixedly connected to the bottom of the elastic plate (41), the connecting rods (45) are in an "L" shape, a rubber ball (451) is fixedly connected to the surface of the connecting rod (45), the surface of the rubber ball (451) abuts against the surface of the transmission roller (6), and a plurality of annular grooves are formed at one end of the connecting rod (45); A plurality of friction tubes (44) are fixedly connected to the bottom of the fixing plate (4), and the friction tubes (44) are arranged in a uniform array at the bottom of the fixing plate (4). A rubber sleeve is fixedly connected to the inner wall of the friction tube (44), and the inner wall of the rubber sleeve abuts against the inner wall of the annular groove; The fixed screen plate (5) has magnetism, a compression plate (51) is fixedly connected to the side wall of the fixed screen plate (5), a plurality of transmission shafts (52) are fixedly connected to the surface of the compression plate (51), the transmission shaft (52) is in a "U" shape, a plurality of elastic shafts (54) are fixedly connected to the bottom of the transmission shaft (52), and a counterweight ball (541) is fixedly connected to the bottom of the elastic shaft (54); A plurality of position limiting tubes (53) are fixedly connected to the surface of the fixed sieve plate (5), and the elastic shaft (54) is movably arranged inside the position limiting tubes (53); A pair of straight grooves are provided on the surface of the position limiting tube (53), and a compression shaft (532) is movably provided in the straight groove. A friction ring (531) is fixedly connected to the top of the compression shaft (532), and the friction ring (531) is made of rubber. A plurality of rubber rings (533) are fixedly connected to the inner wall of the position limiting tube (53), and the inner wall of the rubber ring (533) abuts against the surface of the elastic shaft (54); A plurality of fixing grooves (62) are formed on the surface of the driving roller (6), a plurality of extrusion plates (63) are fixedly connected to the inner wall of the fixing groove (62), the extrusion plates (63) are symmetrically arranged, a metal sheet (65) is fixedly connected to the extrusion plates (63), and a driving rod (64) is fixedly connected to the metal sheet (65); A plurality of metal balls (641) are fixedly connected to the surface of the transmission rod (64), and the metal balls (641) are located between the metal sheets (65).

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