A photovoltaic inverter housing forming apparatus

Abstract

The application discloses a photovoltaic inverter shell forming equipment, which comprises a workbench and further comprises a conveying belt for sequentially conveying shell plate materials, the conveying belt being connected with the workbench; a rolling roller for flattening the shell plate materials, the rolling roller being arranged on the conveying belt; and a processing unit for cleaning impurities on the shell plate materials. The photovoltaic inverter shell forming equipment is provided with a primary cleaning assembly, so that the shell plate materials are obliquely conveyed downward under the guidance of the guide rollers, the impurities on the shell plate materials slide downward under the influence of gravity, the impurities are removed by being rubbed by the first clamping roller and the second clamping roller, the impurities are separated from the shell plate materials by the first baffle and the second baffle during the removal, and the impurities are collected in the cavity formed by the workbench, so that the impurities in the cavity are collected by the dust suction device, and the impurities on the upper and lower surfaces of the shell plate materials are cleaned.

Description

Technical Field

[0001] This invention relates to the field of housing molding technology, specifically to a photovoltaic inverter housing molding equipment. Background Technology

[0002] As the core equipment in a photovoltaic power generation system, the reliability, conversion efficiency, input voltage range, and other technical performance of the photovoltaic inverter directly determine the utilization rate and return on investment of the photovoltaic power generation system.

[0003] The housing of the photovoltaic inverter is made of aluminum alloy, which is lightweight, weather-resistant, corrosion-resistant, and easy to seal. The housing materials of photovoltaic inverters are 1060, 1070, 3004, and 5052, among which 3004 aluminum plate has both performance and price advantages.

[0004] In existing photovoltaic inverter housing manufacturing, the material is first rolled into a sheet of the required thickness, then conveyed and cut, and finally formed. However, during the rolling process, both the sheet and the roller are exposed to the external environment, making it easy for dust and impurities to adhere to the surface of the sheet. If these are not cleaned in time, the forming quality of the sheet will be affected. Furthermore, during the conveying and forming process, the sheet must be manually fixed in position each time, which is not only cumbersome but also wastes manpower and affects production efficiency. Therefore, we propose a photovoltaic inverter housing forming equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a photovoltaic inverter housing molding device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a photovoltaic inverter housing forming device, comprising a workbench, and further comprising:

[0007] A conveyor belt is used to sequentially transport shell sheets, and the conveyor belt is connected to the worktable;

[0008] A rolling roller is used to flatten the shell sheet material; the rolling roller is mounted on a conveyor belt.

[0009] A processing unit is used to clean impurities from the shell sheet material, and the processing unit is located between the workbench and the conveyor belt;

[0010] The processing unit includes:

[0011] The first baffle plate is used to block and conduct impurities. The baffle plate is connected to the workbench and is located on both sides of the shell plate.

[0012] The second baffle plate is used to receive and guide impurities. The second baffle plate is connected to the other side of the workbench and is located on both sides of the shell plate.

[0013] The initial cleaning component is used to initially clean large impurities on the shell plate, and the initial cleaning component is located between the first baffle plate and the second baffle plate.

[0014] A second cleaning component is used to clean small impurities on the shell sheet material again; the second cleaning component is located on one side of the workbench.

[0015] A transfer unit is used to transport and transfer shell sheet materials, and the transfer unit is located on one side of the conveyor belt.

[0016] Preferably, the first baffle plate and the second baffle plate are connected to the inner wall of the workbench and form a cavity with it, and the second baffle plate extends to the outside of the workbench and abuts against the rolling roller.

[0017] Preferably, the transfer unit includes:

[0018] A rolling assembly is used to roll the cut shell sheet material. The rolling assembly is connected to the conveyor belt and is located on both sides of the conveyor belt.

[0019] A reference assembly is used for transferring and forming the cut shell sheet material, and the reference assembly is located at one end of the conveyor belt.

[0020] Preferably, the initial cleaning component includes:

[0021] Guide rollers are used to guide and convey the shell sheet material. The guide rollers are connected to the worktable and are located at the bottom of the second baffle plate.

[0022] The first clamping roller is used to convey and remove impurities from the shell plate. The first clamping roller is located at the bottom of the first baffle plate.

[0023] The second clamping roller is used to guide and remove impurities from the shell plate. The second clamping roller is located at the bottom of the first clamping roller and abuts against the second baffle plate.

[0024] An air outlet device is used to remove impurities from the shell sheet by discharging air, and the air outlet device is located between the first clamping roller and the second clamping roller;

[0025] A dust-collecting device is used to adsorb and collect impurities in the cavity, and the dust-collecting device is respectively installed in the cavity.

[0026] Preferably, one side of the second baffle plate is provided with a cut surface for removing impurities from the rolling roller.

[0027] Preferably, the re-cleaning component includes:

[0028] A blocking block is used to block impurities on the shell sheet material during the transverse conveying of the guide roller. The blocking block is located on both sides of the conveyor belt, and both sides of the blocking block are provided with a shoveling surface.

[0029] The first driving gear is disposed on the blocking block;

[0030] A first rack is meshed with the first drive gear, and the first rack is located on one side of the blocking block, and a first cleaning block is connected to the first rack;

[0031] The second rack is meshed with the first drive gear and is located on the other side of the blocking block, and a second cleaning block is connected to the second rack.

[0032] Preferably, the rolling assembly includes:

[0033] A reference plate, which is mounted on top of the conveyor belt via a mounting plate;

[0034] Friction rollers are used to roll and grind the cut. Multiple sets of friction rollers are evenly arranged along the length of the reference plate, and a driving element is provided on one side of each friction roller.

[0035] An elastic element is disposed between the mounting plate and the reference plate.

[0036] Preferably, the driving element includes:

[0037] The second driving gear is located on one side of the reference plate;

[0038] A gear belt, which meshes with the second driving gear;

[0039] The first driven gear is connected to the friction roller and is meshed with a gear belt;

[0040] An abutting roller is disposed between the second driving gear and the first driven gear.

[0041] Preferably, guide plates for guiding the housing plate are provided on both sides of the reference plate.

[0042] Preferably, the reference component includes:

[0043] A baffle plate is disposed at one end of the conveyor belt;

[0044] A push block is provided on the top of the baffle plate, and a drive rack is provided on one side of the push block;

[0045] The mounting frame is connected to the baffle plate, and the mounting frame is respectively provided with a third driving gear and a second driven gear. The third driving gear and the second driven gear are meshed and connected. The third driving gear passes through the mounting frame and is coaxially connected to the third driven gear. The third driven gear is meshed and connected to the drive rack.

[0046] The centering rod is connected to the third driving gear and the second driven gear.

[0047] Compared with the prior art, the beneficial effects of the present invention are:

[0048] This invention, through the initial cleaning component, causes the shell sheet to be conveyed obliquely downward under the guidance of the guide rollers. Impurities on the shell sheet slide downward under the influence of their own gravity. Combined with the conveying action of the first and second clamping rollers, the impurities on the shell sheet are removed by friction. During the removal process, the first and second baffles are used to separate the impurities from the shell sheet and place them into the cavity formed by the shell sheet and the worktable. The impurities in the cavity are then collected by the dust suction device, thus achieving the cleaning of impurities on the upper and lower surfaces of the shell sheet.

[0049] The present invention uses a re-cleaning component to first block impurities that have not been completely cleaned on the shell sheet material by means of blocking blocks located at the upper and lower positions of the conveyor belt, and then further cleans the remaining impurities on the blocking blocks and the shell sheet material under the cleaning action of the first cleaning block and the second cleaning block.

[0050] This invention uses a reference component to define the position of the cut shell sheet by a baffle plate. Then, a pusher block drives the sheet forward to move it to the forming equipment. During the pushing process, a centering rod is driven to center both sides of the sheet, thereby determining the position of the sheet and facilitating automated determination of the sheet position. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the overall positive axis structure of the present invention;

[0052] Figure 2 This is a schematic diagram of the overall front structure of the present invention;

[0053] Figure 3 This is a schematic diagram of the shell plate conveying process of the present invention;

[0054] Figure 4 This is a schematic diagram of the initial cleaning component structure of the present invention;

[0055] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0056] Figure 6 This is a schematic diagram of the structure of the component being cleaned again in this invention;

[0057] Figure 7 This is a schematic diagram of the driving component structure of the present invention;

[0058] Figure 8 This is a schematic diagram of the reference plate structure of the present invention;

[0059] Figure 9 This is a schematic diagram of the basic component structure of the present invention;

[0060] Figure 10 This is a schematic diagram of the exploded structure of the reference component of the present invention from another angle;

[0061] Figure 11 This is a schematic diagram of the process of pushing the shell plate of the reference component of the present invention.

[0062] In the diagram: 100-Workbench; 10-Conveyor Belt; 20-Rolling Roller; 1-Processing Unit; 11-First Baffle Plate; 12-Second Baffle Plate; 13-Initial Cleaning Component; 14-Re-cleaning Component; 2-Transfer Unit; 21-Rolling Component; 22-Base Component; 131-Guide Roller; 132-First Clamping Roller; 133-Second Clamping Roller; 134-Air Exhaust Device; 135-Dust Suction Device; 121-Cut Surface; 141-Blocking Block; 142-Shoveled Surface; 143-First Drive Gear; 144-The... 145-First cleaning block; 146-Second rack; 147-Second cleaning block; 111-Cavity; 211-Base plate; 212-Friction roller; 213-Elastic element; 3-Drive element; 31-Second driving gear; 32-Gear belt; 33-First driven gear; 34-Abutting roller; 221-Baffle plate; 222-Push block; 223-Drive rack; 224-Mounting bracket; 225-Third driving gear; 226-Second driven gear; 227-Third driven gear; 228-Centering rod. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] Example 1:

[0065] Please see Figure 1-6 The present invention provides a technical solution: a photovoltaic inverter housing forming equipment, including a workbench 100, and further comprising:

[0066] Conveyor belt 10 is used to sequentially transport shell plates, and the conveyor belt 10 is connected to the worktable 100;

[0067] Roller 20 is used to flatten the shell sheet material, and the roller 20 is disposed on the conveyor belt 10;

[0068] Processing unit 1 is used to clean impurities on the shell sheet material. The processing unit 1 is located between the workbench 100 and the conveyor belt 10.

[0069] The processing unit 1 includes:

[0070] The first baffle plate 11 is used to block and conduct impurities. The baffle plate is connected to the workbench 100 and is located on both sides of the shell plate.

[0071] The second baffle plate 12 is used to receive and guide impurities. The second baffle plate 12 is connected to the other side of the workbench 100 and is located on both sides of the shell plate.

[0072] The initial cleaning component 13 is used to initially clean large impurities on the shell plate. The initial cleaning component 13 is located between the first wind baffle 11 and the second wind baffle 12.

[0073] The second cleaning component 14 is used to clean small impurities on the shell sheet again. The second cleaning component 14 is located on one side of the workbench 100.

[0074] Transfer unit 2 is used to transfer and rotate shell sheet material, and the transfer unit 2 is located on one side of the conveyor belt 10;

[0075] The worktable 100 is capable of fixing the rolled shell sheet material. One end of the shell sheet material extends downward and is conveyed by the conveyor belt 10 so that it is rolled by the rolling roller 20 to be pressed into a thinner sheet. This is the prior art.

[0076] It should be noted that the shell sheet is placed in a roll and one end passes through the workbench 100, forming an inclined angle with the ground. This setting makes it easier for any impurities adhering to the upper and lower surfaces of the sheet to fall off automatically due to gravity.

[0077] The first baffle plate 11 and the second baffle plate 12 are connected to the inner wall of the workbench 100 and form a cavity 111 with it. The second baffle plate 12 extends to the outside of the workbench 100 and abuts against the rolling roller 20.

[0078] This allows internal dust and impurities to fall into the cavity 111 and avoids secondary pollution to the surface of the sheet material.

[0079] The initial cleaning component 13 includes:

[0080] Guide roller 131 is used to guide and convey the shell plate material. The guide roller 131 is connected to the worktable 100 and is located at the bottom of the second baffle plate 12.

[0081] The first clamping roller 132 is used to convey and remove impurities from the shell plate. The first clamping roller 132 is located at the bottom of the first baffle plate 11.

[0082] The second clamping roller 133 is used to guide and remove impurities from the shell plate. The second clamping roller 133 is located at the bottom of the first clamping roller 132 and abuts against the second baffle plate 12.

[0083] An air outlet device 134 is used to remove impurities from the shell plate by emitting air. The air outlet device 134 is located between the first clamping roller 132 and the second clamping roller 133.

[0084] Dust-absorbing device 135 is used to adsorb and collect impurities in cavity 111, and the dust-absorbing device 135 is respectively disposed in cavity 111;

[0085] The air outlet device 134 can preferably be a fan. Multiple sets of fans are evenly arranged along the width direction of the board. The air outlet can blow off the impurities adhering to the surface of the board.

[0086] The principle of the dust collection device 135 is the same as that of a vacuum cleaner, which can collect dust and light impurities.

[0087] The guide roller 131 is located between the conveyor belt 10 and the worktable 100. The sheet material is guided by the guide roller 131 to be conveyed along the direction of the conveyor belt 10. The first clamping roller 132 is driven by a motor to rotate clockwise. It can convey the sheet material and roll off the impurities on the sheet material. After the conveyed sheet material is conveyed to the position of the second clamping roller 133, the second clamping roller 133 rotates in the opposite direction to the rotation direction of the first clamping roller 132 and rotates at a speed less than that of the first clamping roller 132. This allows the second clamping roller 133 to roll off the residual impurities on the sheet material while rotating. The second baffle plate 12 is tangent to one side of the second clamping roller 133 and can remove the impurities on the second clamping roller 133. The second baffle plate 12 is arc-shaped, so the removed impurities can slide down along it and be blown off by the air outlet device 134, and then collected by the dust suction device 135.

[0088] The second baffle plate 12 has a cut surface 121 on one side for removing impurities from the roller 20. The roller 20 is exposed to the external environment and dust will adhere to its surface. The cut surface 121 on the second baffle plate 12 can be used to circulate and clean its surface.

[0089] The re-cleaning component 14 includes:

[0090] The blocking block 141 is used to block impurities on the shell plate material being transported laterally by the guide roller 131. The blocking block 141 is provided on both sides of the conveyor belt 10, and both sides of the blocking block 141 are provided with a shovel surface 142.

[0091] The first drive gear 143 is disposed on the blocking block 141;

[0092] The first rack 144 is meshed with the first drive gear 143, and the first rack 144 is located on one side of the blocking block 141, and a first cleaning block 145 is connected to the first rack 144.

[0093] The second rack 146 is meshed with the first drive gear 143, and the second rack 146 is located on the other side of the blocking block 141, and a second cleaning block 147 is connected to the second rack 146.

[0094] When the sheet material is conveyed to the position of the blocking block 141, the blocking block 141 can block the impurities remaining on the sheet material. The blocked impurities can accumulate on the shovel surface 142. In order to remove the impurities, the first drive gear 143 driven by the motor drives the first rack 144 and the second rack 146 to move towards each other. This causes the first cleaning block 145 and the second cleaning block 147 to move with the first rack 144 and the second rack 146, thereby cleaning the impurities at the front end of the blocking block 141.

[0095] Example 2:

[0096] Please see Figure 7-11 The transfer unit 2 includes:

[0097] Rolling assembly 21 is used to roll the cut shell sheet material. The rolling assembly 21 is connected to the conveyor belt 10 and is disposed on both sides of the conveyor belt 10.

[0098] Reference component 22 is used for transferring and forming the cut shell sheet material, and the reference component 22 is located at one end of the conveyor belt 10;

[0099] A cutting assembly is provided before the rolling assembly 21 for cutting the sheet material. This is prior art and is not shown in the figure.

[0100] Rough edges may appear after cutting. These rough edges can be processed by the rolling assembly 21, and the processed sheet material is automatically shaped under the alignment action of the reference assembly 22.

[0101] The rolling assembly 21 includes:

[0102] Reference plate 211, which is mounted on top of conveyor belt 10 via a mounting plate;

[0103] Friction roller 212 is used to roll and grind the cut. Multiple sets of friction roller 212 are evenly arranged along the length direction of the reference plate 211, and a driving member 3 is provided on one side of the friction roller 212.

[0104] Elastic element 213 is disposed between the mounting plate and the reference plate 211;

[0105] The reference plate 211 is used to press the plate material to perform the initial pressing. After the plate material passes through, the friction roller 212 rolls and rubs the rough edges of the plate material to remove the rough edges. Under the action of the elastic frame, the friction roller 212 can perform adjustable pressing on the plate material.

[0106] The driving component 3 includes:

[0107] The second drive gear 31 is disposed on one side of the reference plate 211;

[0108] Gear belt 32, which meshes with the second driving gear 31;

[0109] The first driven gear 33 is connected to the friction roller 212 and is meshed with the gear belt 32.

[0110] Abutting roller 34 is disposed between the second driving gear 31 and the first driven gear 33;

[0111] Driven by the motor, the second driving gear 31 rotates, which in turn drives the first driven gear 33 and the gear belt 32 to rotate, thereby driving the friction roller 212 to rotate. The rotation direction of the friction roller 212 is opposite to the transmission direction of the transmission belt 10, which allows the sheet material to have enough time for grinding.

[0112] The reference plate 211 is provided with guide plates 214 on both sides for guiding the shell plate material, so as to facilitate the entry of the plate material during use.

[0113] The reference component 22 includes:

[0114] Baffle 221, wherein the baffle 221 is disposed at one end of the conveyor belt 10;

[0115] Push block 222, the push block 222 is disposed on the top of the baffle plate 221, and a drive rack 223 is provided on one side of the push block 222;

[0116] Mounting bracket 224 is connected to the baffle plate 221. The mounting bracket 224 is provided with a third driving gear 225 and a second driven gear 226. The third driving gear 225 and the second driven gear 226 are meshed. The third driving gear 225 passes through the mounting bracket 224 and is coaxially connected to a third driven gear 227. The third driven gear 227 is meshed with the drive rack 223.

[0117] Centering rod 228, which is connected to the third driving gear 225 and the second driven gear 226;

[0118] After the sheet material is conveyed by the conveyor belt 10 to the position of the baffle plate 221, the position of the sheet material conveyed each time is fixed. After the position is determined, the push block 222 (the bottom of the push block 222 is equipped with a suction cup that can attract and fix the sheet material, which is not shown in the figure) is driven by the cylinder to push the sheet material forward. When it moves to the position of the third driven gear 227, the drive rack 223 on one side of the push block 222 meshes with it, thereby causing the third driven gear 227 to rotate. The third driven gear 227 drives the third drive gear 225. The third drive gear 225 meshes with the second driven gear 226, thereby causing the centering rod 228 to move towards each other. After the push block 222 pushes the sheet material onto the forming equipment, the centering rod 228 also performs centering treatment on both sides of the sheet material, so that the position of the sheet material is determined each time, shortening the time for fixing the sheet material position.

[0119] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0120] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic inverter housing forming apparatus comprising a worktable (100), characterized in that: Also include: A conveying belt (10) for sequentially conveying the shell plate, the conveying belt (10) is connected with the workbench (100); A rolling roller (20) for flattening the shell plate, the rolling roller (20) is provided on the conveying belt (10); A processing unit (1) for cleaning impurities on the shell plate, the processing unit (1) is provided between the workbench (100) and the conveying belt (10); The processing unit (1) comprises: A first baffle (11) for blocking and guiding impurities, the baffle is connected with the workbench (100) and is provided on both sides of the shell plate; A second baffle (12) for receiving and guiding impurities, the second baffle (12) is connected with the other side of the workbench (100) and is provided on both sides of the shell plate; A primary cleaning assembly (13) for primarily cleaning large particles of impurities on the shell plate, the primary cleaning assembly (13) is provided between the first baffle (11) and the second baffle (12); A secondary cleaning assembly (14) for cleaning small particles of impurities on the shell plate, the secondary cleaning assembly (14) is provided on one side of the workbench (100); A transfer unit (2) for conveying and transferring the shell plate, the transfer unit (2) is provided on one side of the conveying belt (10); The first baffle (11) and the second baffle (12) are connected with the inner wall of the workbench (100) and form a cavity (111) with the inner wall, the second baffle (12) extends to the outside of the workbench (100) and abuts against the rolling roller (20); The transfer unit (2) comprises: A rolling assembly (21) for rolling the cut shell plate, the rolling assembly (21) is connected with the conveying belt (10) and is provided on both sides of the conveying belt (10); A reference assembly (22) for transferring and forming the cut shell plate, the reference assembly (22) is provided at one end of the conveying belt (10); The primary cleaning assembly (13) comprises: A guide roller (131) for guiding and conveying the shell plate, the guide roller (131) is connected with the workbench (100) and is provided at the bottom of the second baffle (12); A first clamping roller (132) for conveying and removing impurities on the shell plate, the first clamping roller (132) is provided at the bottom of the first baffle (11); A second clamping roller (133) for guiding and removing impurities on the shell plate, the second clamping roller (133) is provided at the bottom of the first clamping roller (132) and abuts against the second baffle (12); An air outlet device (134) for removing impurities on the shell plate by air outlet, the air outlet device (134) is provided between the first clamping roller (132) and the second clamping roller (133); An ash suction device (135) for adsorbing and collecting impurities in the cavity (111), the ash suction device (135) is respectively provided in the cavity (111); One side of the second baffle (12) is provided with a cutting surface (121) for removing impurities on the rolling roller (20); The secondary cleaning assembly (14) comprises: A blocking block (141) is arranged on both sides of the transmission belt (10) to block impurities in the lateral conveying of the shell plate material by the guide roller (131), and both sides of the blocking block (141) are provided with a shovel surface (142); A first driving gear (143) is arranged on the blocking block (141); A first rack (144) is in meshing connection with the first driving gear (143), and the first rack (144) is arranged on one side of the blocking block (141), and a first cleaning block (145) is connected to the first rack (144); A second rack (146) is in meshing connection with the first driving gear (143), and the second rack (146) is arranged on the other side of the blocking block (141), and a second cleaning block (147) is connected to the second rack (146).

2. A photovoltaic inverter housing forming apparatus according to claim 1, wherein: The rolling assembly (21) comprises: A reference plate (211) is arranged on the top of the transmission belt (10) through a mounting plate; Friction rollers (212) are used to roll and polish the slit, and a plurality of groups of friction rollers (212) are uniformly arranged along the length direction of the reference plate (211), and one side of the friction roller (212) is provided with a driving member (3); An elastic member (213) is arranged between the mounting plate and the reference plate (211).

3. A photovoltaic inverter housing forming apparatus according to claim 2, wherein: The driving member (3) comprises: A second driving gear (31) is arranged on one side of the reference plate (211); A gear belt (32) is in meshing connection with the second driving gear (31); A first driven gear (33) is connected with the friction roller (212), and the first driven gear (33) is in meshing connection with the gear belt (32); An abutting roller (34) is arranged between the second driving gear (31) and the first driven gear (33).

4. A photovoltaic inverter housing forming apparatus according to claim 3, wherein: Both sides of the reference plate (211) are provided with a guide plate (214) for guiding the shell plate material.

5. The photovoltaic inverter housing forming apparatus of claim 1, wherein: The reference assembly (22) comprises: A material blocking plate (221) is arranged at one end of the transmission belt (10); A pushing block (222) is arranged on the top of the material blocking plate (221), and one side of the pushing block (222) is provided with a driving rack (223); A mounting frame (224) is connected with the material blocking plate (221), and a third driving gear (225) and a second driven gear (226) are respectively arranged on the mounting frame (224), the third driving gear (225) is in meshing connection with the second driven gear (226), the third driving gear (225) coaxially connects a third driven gear (227) through the mounting frame (224), and the third driven gear (227) is in meshing connection with the driving rack (223); a pair of centering rods (228) connected with the third pinion (225) and the second driven gear (226).

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