Soldering tin clamp capable of achieving automatic overturning and multi-face welding of battery pack

Abstract

The utility model discloses a battery pack automatic turnover multi-face welding tin soldering clamp which comprises a clamp turnover device and a multi-face special-shaped clamp, a fixing device is arranged between contact faces of the clamp turnover device and the multi-face special-shaped clamp, two sets of clamp locking plates are arranged on the bottom face of the multi-face special-shaped clamp, and the clamp locking plates are connected with the clamp turnover device. The clamp locking plates penetrate through the receding holes and extend downwards, and the fixing device is fixedly connected with the two clamp locking plates. According to the utility model, the fixing device and the clamp locking plate are matched and fastened, so that the multi-surface special-shaped clamp is fixedly arranged at the output end of the clamp turnover device, and the requirement of driving a battery pack to automatically turn over is met. According to the utility model, the special-shaped battery pack can be subjected to multi-surface welding operation on the soldering machine, manual turnover is not needed, the labor cost is saved, and the overall processing efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery product welding, in particular to a soldering fixture for automatically turning over a battery pack for multi-side welding. Background Art

[0002] With the rapid development of battery technology and the wide expansion of its application fields, the types and appearance structures of batteries are becoming more and more complex and diversified, and the welding technology requirements in the battery production process are also becoming higher and higher.

[0003] In the existing battery industry, welding from the assembly of battery cells to the series connection of battery modules is mainly done manually or with automatic welding equipment. Manual welding is labor-intensive and has low production efficiency, making it difficult to meet the needs of large-scale production. The welding quality is easily affected by the individual skill differences of workers, making it difficult to guarantee the welding quality.

[0004] Automated welding equipment not only ensures consistent welding quality, but also improves production efficiency and reduces labor costs. However, automated welding equipment requires customized fixtures for battery products of different shapes and sizes, and the poor compatibility between fixtures increases production costs.

[0005] For multi-sided special-shaped products, conventional fixtures of automated welding equipment are difficult to position and weld multiple sides, requiring manual intervention during the welding process, or the welding of multi-sided special-shaped products must be completed directly by manual labor, which will lead to problems of unstable welding quality and low production efficiency.

[0006] Therefore, the existing technology has defects and needs to be improved. Utility Model Content

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a soldering fixture for automatically turning over a battery pack for multi-side welding.

[0008] The technical solution of the present utility model is as follows: A soldering fixture for automatic flipping of a battery pack for multi-sided welding is provided, comprising: a fixture flipping device, and a multi-sided special-shaped fixture movably arranged on the fixture flipping device, a fixing device is provided between the fixture flipping device and the contact surface of the multi-sided special-shaped fixture, the fixture flipping device is provided with an air avoidance hole at the contact surface corresponding to the multi-sided special-shaped fixture, a crossbeam is provided in the middle of the air avoidance hole, the fixing device is provided on the bottom surface of the crossbeam, and two groups of fixture locking plates are provided on the bottom surface of the multi-sided special-shaped fixture, the fixture locking plates pass through the air avoidance holes and extend downward, and the fixing device is respectively connected and fixed to the two groups of fixture locking plates.

[0009] Furthermore, the fixing device adopts pneumatic fingers, and the output ends on both sides of the pneumatic fingers are respectively provided with clamp locking blocks, and the clamp locking plate is provided with a clamp locking groove corresponding to the clamp locking block. The pneumatic fingers drive the clamp locking block to move toward the clamp locking plate, and make the clamp locking block movably embedded in the clamp locking groove.

[0010] Furthermore, a plurality of first magnetic connection structures are provided on the contact surface between the fixture flipping device and the multi-sided special-shaped fixture, and the first magnetic connection structures are respectively provided on the fixture flipping device and the multi-sided special-shaped fixture, and the polarities of the first magnetic connection structures on the fixture flipping device and the multi-sided special-shaped fixture are opposite;

[0011] The first magnetic connection structure uses a neodymium magnet.

[0012] Furthermore, the clamp flipping device includes: a base, a driving motor arranged on one side of the base, a transmission mechanism connected to the output end of the driving motor, and a clamp mounting seat connected to the output end of the transmission mechanism. The left and right sides of the clamp mounting seat can be rotatably connected to the two side vertical plates of the base respectively, and the rotating shaft on one side of the clamp mounting seat is connected to the output end of the transmission mechanism. The driving motor drives the clamp mounting seat to rotate through the transmission mechanism, and the multi-faceted special-shaped clamp is movably set on the clamp mounting seat.

[0013] Furthermore, the beams are distributed along the axial direction of the rotation axis of the fixture mounting seat, and the output end of the fixing device arranged on the bottom surface of the beams is perpendicular to the distribution direction of the beams.

[0014] Furthermore, a pair of clamp guide blocks are symmetrically arranged on the front and rear sides of the clamp mounting seat, a clamp positioning column is arranged between each pair of the clamp guide blocks, a clamp positioning platform is provided on the multi-faceted special-shaped clamp, and clamp positioning holes are provided on the clamp positioning platform corresponding to the clamp positioning columns. The clamp positioning columns pass through the clamp positioning holes, and the clamp positioning platform is embedded between the clamp guide blocks.

[0015] Furthermore, the multi-faceted special-shaped fixture includes: a fixture base, baffles fixedly arranged on the left and right sides of the fixture base, side cover plates hinged on the front and rear sides of the fixture base, and a top cover plate hinged on the baffle on one side. The fixture base is provided with a number of product positioning blocks, and the side cover plates and the top cover plates are respectively flipped outward around the hinge position to unfold, or flipped inward to close; when the side cover plates are closed, the two ends of the inner wall of the side cover plates are respectively in contact with the baffle plates; when the top cover plate is closed, the side of the top cover plate away from the hinge position is in contact with the top surface of the baffle where the hinge position is not set.

[0016] Furthermore, a plurality of second magnetic connection structures are respectively provided on the contact surfaces of the baffle and the side cover plate and the top cover plate, and the magnetism of the corresponding second magnetic connection structures is opposite; the second magnetic connection structures use neodymium magnets.

[0017] Furthermore, a cover plate buckle assembly is provided on the side baffle that is not hinged to the top cover plate. When the top cover plate is closed on the baffle, the edge of the top cover plate is fixed and limited by the cover plate buckle assembly.

[0018] Furthermore, pressure blocks are provided on the front and rear sides of the top cover plate corresponding to the side cover plates. When the top cover plate is closed on the baffle plate, the pressure blocks are in contact with the outer side surfaces of the side cover plates.

[0019] By adopting the above solution, the present invention secures the multi-faceted special-shaped fixture to the output end of the fixture flipping device by cooperating and fastening the fixture device with the fixture locking plate. This allows the multi-faceted special-shaped fixture to be assembled and fixed to the fixture flipping device, thereby satisfying the requirement of driving the multi-faceted special-shaped fixture to rotate via the fixture flipping device, thereby automatically flipping the battery pack clamped and fixed in the multi-faceted special-shaped fixture. The soldering fixture provided by the present invention allows special-shaped battery packs requiring multi-sided welding to be welded on multiple sides in a single clamping operation on the soldering machine, eliminating the need for manual intervention and flipping, thus saving labor costs. It also eliminates the need for machine downtime and waiting during the soldering process, effectively improving overall processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a structural schematic diagram of the fixture flipping device.

[0022] Figure 3 Schematic diagram of the structure of a multi-faceted special-shaped fixture.

[0023] Figure 4 Schematic diagram of the unfolded structure of the multi-faceted special-shaped structure. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See also Figures 1 to 3The utility model provides a soldering fixture for automatic flipping and multi-sided welding of a battery pack, comprising: a fixture flipping device 1, and a multi-sided special-shaped fixture 2 movably arranged on the fixture flipping device 1, a fixing device 3 is arranged between the contact surface of the fixture flipping device 1 and the multi-sided special-shaped fixture 2, the fixture flipping device 1 is provided with an avoidance hole 141 at the contact surface corresponding to the multi-sided special-shaped fixture 2, a crossbeam 142 is arranged in the middle of the avoidance hole 141, the fixing device 3 is arranged on the bottom surface of the crossbeam 142, and two groups of fixture locking plates 211 are provided on the bottom surface of the multi-sided special-shaped fixture 2, the fixture locking plates 211 pass through the avoidance holes 141 and extend downward, and the fixing device 3 is respectively connected and fixed to the two groups of fixture locking plates 211.

[0026] In the embodiment provided by the present invention, the fixing device 3 cooperates and fastens with the fixture locking plate 211, thereby fixing the multi-sided special-shaped fixture 2 to the output end of the fixture flipping device 1. This assembles and fixes the multi-sided special-shaped fixture 2 to the fixture flipping device 1, thereby satisfying the requirement that the multi-sided special-shaped fixture 2 is driven to rotate by the fixture flipping device 1, thereby automatically flipping the battery pack clamped and fixed in the multi-sided special-shaped fixture 2. The soldering fixture provided by the present invention allows special-shaped battery packs that require multi-sided welding to be welded on multiple sides in a single clamping operation on the soldering machine, eliminating the need for manual intervention and flipping, saving labor costs. At the same time, there is no need to stop the machine and wait during the soldering process, effectively improving overall processing efficiency.

[0027] In some embodiments, the fixing device 3 uses pneumatic fingers, each of which is provided with a clamp locking block 31 on the output end on both sides of the pneumatic fingers. The clamp locking plate 211 is provided with a clamp locking groove 212 corresponding to the clamp locking block 31. The pneumatic fingers drive the clamp locking block 31 to move toward the clamp locking plate 211, and the clamp locking block 31 is movable and embedded in the clamp locking groove 212. When the pneumatic fingers are activated, the output ends on both sides of the pneumatic fingers expand outward, thereby driving the clamp locking block 31 to move toward the clamp locking plate 211 and embedding the clamp locking block 31 into the clamp locking groove 212. While locking and fixing the multi-faceted special-shaped clamp 2, it can effectively prevent the multi-faceted special-shaped clamp 2 from shaking on the clamp turning device 1, which may affect the soldering effect.

[0028] In some embodiments, a plurality of first magnetic connection structures 41 are provided on the contact surface between the fixture flipping device 1 and the multi-faceted special-shaped fixture 2. The first magnetic connection structures 41 are provided on the fixture flipping device 1 and the multi-faceted special-shaped fixture 2, respectively. The polarity of the first magnetic connection structures 41 on the fixture flipping device 1 and the multi-faceted special-shaped fixture 2 is opposite. When the multi-faceted special-shaped fixture 2 is placed on the fixture flipping device 1, the magnetic interaction between the multi-faceted special-shaped fixture 2 and the first magnetic connection structures 41 on the fixture flipping device 1 attracts the multi-faceted special-shaped fixture 2 and the fixture flipping device 1, thereby preventing the multi-faceted special-shaped fixture 2 from bouncing and ensuring a secure and stable assembly between the multi-faceted special-shaped fixture 2 and the fixture flipping device 1.

[0029] The first magnetic connection structure 41 utilizes a neodymium magnet. Neodymium magnets, typically neodymium iron boron (Nd-Fe-B) permanent magnets, are a magnetic material characterized by high magnetic energy product, high coercivity, compact size, light weight, and strong stability. Neodymium magnets have an extremely high magnetic energy product, generating a strong magnetic field within a relatively small volume. Furthermore, they maintain stable magnetic properties even under the influence of an external magnetic field, thereby ensuring the stability of the connection between the multi-faceted, special-shaped fixture 2 and the fixture flipping device 1.

[0030] In some embodiments, see Figure 2 The fixture flipping device 1 includes a base 11, a drive motor 12 disposed on one side of the base 11, a transmission mechanism 13 connected to the output end of the drive motor 12, and a fixture mounting base 14 connected to the output end of the transmission mechanism 13. The left and right sides of the fixture mounting base 14 are rotatably connected to the two side vertical plates 111 of the base 11, respectively. A rotation shaft on one side of the fixture mounting base 14 is connected to the output end of the transmission mechanism 13. The drive motor 12 drives the fixture mounting base 14 to rotate through the transmission mechanism 13. The multi-faceted special-shaped fixture 2 is movably mounted on the fixture mounting base 14. During operation, the drive motor 12 is started, and the transmission mechanism 13 drives the rotation shaft of the fixture mounting base 14 to rotate, causing the fixture mounting base 14 to swing, thereby achieving rotation of the multi-faceted special-shaped fixture 2 and meeting the requirements for adjusting the welding processing surface of the battery pack.

[0031] In some embodiments, the transmission mechanism 13 adopts a synchronous pulley assembly, which drives the synchronous belt to rotate through the main synchronous pulley connected to the output shaft of the drive motor 12, thereby driving the slave synchronous pulley connected to the rotating shaft of the fixture mounting seat 14 to rotate, thereby satisfying the drive for the rotation of the fixture mounting seat 14.

[0032] In some optional embodiments, the transmission mechanism 13 also includes a tensioning pulley, which is in contact with the synchronous belt, and the tensioning force of the synchronous belt can be adjusted by adjusting the relative position between the tensioning pulley and the synchronous belt to ensure the stability of the driving process of the synchronous belt pulley assembly.

[0033] In some optional embodiments, a reset sensor 15 is provided on a side vertical plate 111 of the base 11 away from the drive motor 12, and a reset sensing piece 151 is provided on the rotating shaft of the clamp mounting seat 14 corresponding to the reset sensor 15, so that when the reset sensing piece 151 passes through the detection position of the reset sensor 15, the reset sensor 15 detects the reset sensing piece 151 and outputs a corresponding signal, so that the system can identify the reset status of the clamp mounting seat 14, thereby facilitating the removal or clamping of the battery pack in the multi-faceted special-shaped clamp 2.

[0034] In some embodiments, the crossbeams 142 are distributed along the axial direction of the rotation axis of the fixture mounting base 14, and the output end of the fixing device 3 disposed on the bottom surface of the crossbeams 142 is perpendicular to the distribution direction of the crossbeams 142. The output surface of the fixing device 3 faces the front and rear side surfaces of the multi-faceted special-shaped fixture 2, which can effectively prevent the multi-faceted special-shaped fixture 2 from moving in the front-to-back direction.

[0035] In some embodiments, a pair of fixture guide blocks 143 are symmetrically provided on the front and rear sides of the fixture mounting seat 14, with a fixture positioning column 144 provided between each pair of the fixture guide blocks 143. A fixture positioning platform 213 is provided on the multi-faceted special-shaped fixture 2. The fixture positioning platform 213 is provided with fixture positioning holes 214 corresponding to the fixture positioning columns 144. The fixture positioning columns 144 pass through the fixture positioning holes 214, and the fixture positioning platform 213 is embedded between the fixture guide blocks 143. The fixture guide blocks 143 limit the fixture positioning platform 213, and the coordination between the fixture positioning columns 144 and the fixture positioning holes 214 effectively prevents the multi-faceted special-shaped fixture 2 from moving left and right on the fixture mounting seat 14 or angular deflection on the fixture mounting seat 14, thereby ensuring the assembly stability of the multi-faceted special-shaped fixture 2 on the fixture mounting seat 14.

[0036] In some embodiments, see Figure 3 、 Figure 4The multi-surface special-shaped clamp 2 comprises a clamp base 211, a baffle 22 fixedly arranged on the left and right sides of the clamp base 211, a side cover plate 23 hingedly arranged on the front and rear sides of the clamp base 211, and a top cover plate 24 hingedly arranged on one side of the baffle 22. The clamp base 211 is provided with a plurality of product positioning blocks 25. The side cover plate 23 and the top cover plate 24 are respectively flipped outward and unfolded or flipped inward and closed around the hinge positions. When the side cover plate 23 is closed, the two ends of the inner side wall of the side cover plate 23 are respectively in contact with the baffles 22. When the top cover plate 24 is closed, the side of the top cover plate 24 away from the hinge position is in contact with the top surface of the baffle 22 which is not provided with a hinge position.

[0037] When the battery pack product is placed in the multi-surface special-shaped clamp 2, the top cover plate 24 and the side cover plate 23 are first opened to expose the clamp base 211, so that the battery pack product can be placed on the clamp base 211. At this time, the product positioning blocks 25 are in contact with each side of the battery pack to limit and fix the battery pack. Then the side cover plate 23 and the top cover plate 24 are successively closed to fix the battery pack in the multi-surface special-shaped clamp 2. In some optional embodiments, the product positioning blocks 25 adopt an L-shaped structure to meet the requirement of limiting and fixing each side of the battery pack. According to the size of the battery pack, different product positioning blocks 25 can be replaced or the installation position of the product positioning blocks 25 can be adjusted to adapt to the clamping and positioning requirements of battery packs of different specifications.

[0038] In some optional embodiments, a plurality of soldering through holes are arranged on the side cover plate 23 and the top cover plate 24 respectively, so that the soldering gun can pass through the side cover plate 23 and the positioning cover plate to perform corresponding soldering work on the battery pack.

[0039] In some embodiments, a plurality of second magnetic connection structures 42 are arranged on the contact surfaces of the baffles 22, the side cover plate 23 and the top cover plate 24 respectively, and the corresponding second magnetic connection structures 42 have opposite magnetic properties. When the side cover plate 23 and / or the top cover plate 24 is closed on the baffle 22, the side cover plate 23 and / or the top cover plate 24 and the second magnetic connection structures 42 on the baffle 22 are mutually attracted through the magnetic action between them, so as to realize the anti-jumping of the multi-surface special-shaped clamp 2 and ensure the firm and stable assembly between the multi-surface special-shaped clamp 2 and the clamp flipping device 1.

[0040] The second magnetic connection structure 42 adopts a neodymium magnet. The neodymium magnet has a very high magnetic energy product and can generate a strong magnetic field in a small volume. Moreover, under the action of an external magnetic field, it can also maintain stable magnetism, so as to ensure the stability of the connection state between the side cover plate 23 and / or the top cover plate 24 and the baffle 22.

[0041] In some embodiments, a cover plate snap assembly 26 is provided on the side baffle 22 that is not hinged to the top cover plate 24. When the top cover plate 24 is closed on the baffle 22, the cover plate snap assembly 26 secures the edge of the top cover plate 24 in place. In some optional embodiments, the cover plate snap assembly 26 includes a snap body provided on the baffle 22 and a snap member hinged to the snap body, with the middle portion of the snap member hinged to the snap body. A spring or torsion spring is provided between the snap member and the snap body, so that the snap member continuously generates a force pressing against the top cover plate 24, thereby compressing and securing the top cover plate 24.

[0042] In some embodiments, pressure blocks 27 are provided on the front and rear sides of the top cover plate 24 corresponding to the side cover plates 23. When the top cover plate 24 is closed on the baffle 22, the pressure blocks 27 contact the outer side surfaces of the side cover plates 23 to limit the movement of the side cover plates 23, and the top cover plate 24 is locked and fixed by the cover plate snap assembly 26, thereby meeting the locking and fixation of the overall structure of the multi-sided special-shaped clamp 2.

[0043] In summary, the present invention secures the multi-faceted, special-shaped fixture to the output end of the fixture flipping device by cooperating and fastening the fixture with the fixture locking plate. This allows the multi-faceted, special-shaped fixture to be assembled and fixed to the fixture flipping device, satisfying the requirement of driving the multi-faceted, special-shaped fixture to rotate via the fixture flipping device, thereby automatically flipping the battery pack clamped and fixed in the multi-faceted, special-shaped fixture. The soldering fixture provided by the present invention allows special-shaped battery packs requiring multi-sided welding to be welded on multiple surfaces on a soldering machine through a single clamping operation. This eliminates the need for manual intervention for flipping, saving labor costs. It also eliminates the need for machine downtime and waiting during the soldering process, effectively improving overall processing efficiency.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A soldering fixture for automatic flipping of battery packs for multi-sided welding, characterized in that: include: A clamp flipping device, and a multi-sided special-shaped clamp movably arranged on the clamp flipping device, a fixing device is arranged between the clamp flipping device and the contact surface of the multi-sided special-shaped clamp, the clamp flipping device is provided with an air avoidance hole at the contact surface corresponding to the multi-sided special-shaped clamp, a crossbeam is arranged in the middle of the air avoidance hole, the fixing device is arranged on the bottom surface of the crossbeam, and two groups of clamp locking plates are provided on the bottom surface of the multi-sided special-shaped clamp, the clamp locking plates pass through the air avoidance hole and extend downward, and the fixing device is respectively connected and fixed to the two groups of clamp locking plates.

2. The soldering fixture for automatic flipping and multi-sided welding of a battery pack according to claim 1, characterized in that: The fixing device adopts pneumatic fingers, and the output ends on both sides of the pneumatic fingers are respectively provided with clamp locking blocks, and the clamp locking plate is provided with a clamp locking groove corresponding to the clamp locking block. The pneumatic fingers drive the clamp locking block to move toward the clamp locking plate, and make the clamp locking block movably embedded in the clamp locking groove.

3. The soldering fixture for automatic flipping and multi-sided welding of a battery pack according to claim 1, characterized in that: A plurality of first magnetic connection structures are provided on the contact surface between the clamp flipping device and the multi-sided special-shaped clamp, and the first magnetic connection structures are respectively provided on the clamp flipping device and the multi-sided special-shaped clamp, and the polarities of the first magnetic connection structures on the clamp flipping device and the multi-sided special-shaped clamp are opposite; The first magnetic connection structure uses a neodymium magnet.

4. The soldering fixture for automatic flipping and multi-sided welding of a battery pack according to claim 1, characterized in that: The clamp flipping device includes: a base, a driving motor arranged on one side of the base, a transmission mechanism connected to the output end of the driving motor, and a clamp mounting seat connected to the output end of the transmission mechanism. The left and right sides of the clamp mounting seat are rotatably connected to the two side vertical plates of the base respectively, and a side rotating shaft of the clamp mounting seat is connected to the output end of the transmission mechanism. The driving motor drives the clamp mounting seat to rotate through the transmission mechanism, and the multi-faceted special-shaped clamp is movably arranged on the clamp mounting seat.

5. The soldering fixture for automatic flipping and multi-sided welding of a battery pack according to claim 4, characterized in that: The crossbeams are distributed along the axial direction of the rotation axis of the fixture mounting seat, and the output end of the fixing device arranged on the bottom surface of the crossbeam is perpendicular to the distribution direction of the crossbeams.

6. The soldering fixture for automatic flipping and multi-sided welding of a battery pack according to claim 4, characterized in that: A pair of clamp guide blocks are symmetrically arranged on the front and rear sides of the clamp mounting seat, a clamp positioning column is arranged between each pair of the clamp guide blocks, a clamp positioning platform is provided on the multi-faceted special-shaped clamp, and clamp positioning holes are provided on the clamp positioning platform corresponding to the clamp positioning columns. The clamp positioning columns pass through the clamp positioning holes, and the clamp positioning platform is embedded between the clamp guide blocks.

7. The soldering fixture for automatic flipping and multi-sided welding of a battery pack according to claim 1, characterized in that: The multi-faceted special-shaped fixture includes: a fixture base, baffles fixed on the left and right sides of the fixture base, side covers hinged on the front and rear sides of the fixture base, and a top cover hinged on the baffle on one side. A number of product positioning blocks are provided on the fixture base, and the side covers and top cover are respectively flipped outward around the hinge position to expand, or flipped inward to close; when the side cover is closed, the two ends of the inner wall of the side cover are respectively in contact with the baffle; when the top cover is closed, the side of the top cover away from the hinge position is in contact with the top surface of the baffle where no hinge position is set.

8. The soldering fixture for automatic flipping and multi-sided welding of a battery pack according to claim 7, characterized in that: A plurality of second magnetic connection structures are respectively provided on the contact surfaces of the baffle, the side cover plate and the top cover plate, and the magnetic properties of the corresponding second magnetic connection structures are opposite; the second magnetic connection structures use neodymium magnets.

9. The soldering fixture for automatic flipping and multi-sided welding of a battery pack according to claim 7, characterized in that: A cover plate buckle assembly is provided on the side baffle that is not hinged to the top cover plate. When the top cover plate is closed on the baffle, the edge of the top cover plate is fixed and limited by the cover plate buckle assembly.

10. The soldering fixture for automatic flipping and multi-side welding of a battery pack according to claim 7, characterized in that: The front and rear sides of the top cover plate are provided with pressure blocks corresponding to the side cover plates. When the top cover plate is closed on the baffle plate, the pressure blocks are in contact with the outer side surfaces of the side cover plates.

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