A sliding shuttle clamp for laser welding

Abstract

The utility model discloses a kind of sliding shuttle clamps for laser welding, it belongs to laser welding fixture technical field, including base, fixed material plate is equipped on base, pressing device, synchronous device, first station device, second station device;Pressing device is arranged on the same side with fixed material plate, synchronous device includes rotary synchronous belt, first station device and second station device are respectively with the rotary upper and lower layer cooperation connection of rotary synchronous belt, and at least one station device is equipped with reciprocating drive assembly, first station device and second station device are exchanged linear reciprocating sliding between pressing device and fixed material plate by the cooperation of reciprocating drive assembly, rotary synchronous belt, first station device and second station device are also respectively equipped with the station material plate that can be longitudinally reset activity, pressing device is pressed to fixed material plate on station material plate when pressing. This structure can realize the stable, high-precision conveying of welding material, improve welding quality and pass rate.

Description

Technical Field

[0001] This utility model relates to the field of laser welding fixture technology, specifically a sliding shuttle fixture for laser welding. Background Technology

[0002] Chinese utility model patent CN202120757812.6 discloses a lifting synchronous slide shuttle feeding mechanism, which includes: a base with a sloped leveling block in the middle; a drive mechanism mounted on the base; a conveying mechanism located on one side of the base; a leveling slide fixedly connected to the conveying mechanism; and a lifting slide connected to the leveling block via rollers in the middle, with its edge connected to the conveying mechanism via a liftable connector. The mechanism uses a cylinder as the driving force to achieve alternating synchronous operation between the two slides. However, the lifting slide, which uses the slope of the leveling block for vertical movement, experiences significant vibration and shaking during sliding and lifting, resulting in poor material conveying accuracy. Furthermore, the material lacks positioning after being conveyed to its designated position, failing to meet the high-precision conveying requirements for welding materials. Therefore, further improvement is necessary. Utility Model Content

[0003] The present invention aims to provide a sliding shuttle fixture for laser welding to overcome the shortcomings of the prior art.

[0004] A sliding shuttle fixture for laser welding, designed for this purpose, includes a base, on which a fixed material plate, a pressing device, a synchronizing device, a first station device, and a second station device are disposed. The pressing device and the fixed material plate are disposed vertically on the same side. The synchronizing device includes a rotary synchronous belt. The first and second station devices are respectively connected to the upper and lower rotating layers of the rotary synchronous belt. At least one station device is provided with a reciprocating drive assembly. The first and second station devices slide linearly and reciprocally between the pressing device and the fixed material plate through the interaction of the reciprocating drive assembly and the rotary synchronous belt. The first and second station devices are also respectively provided with station material plates that can be longitudinally reset. When the pressing device presses down, it presses the station material plates onto the fixed material plate.

[0005] The synchronization device also includes bearing seats, four of which are symmetrically fixed to the base in the front and back and left and right positions respectively. Synchronous pulleys are rotatably mounted on the four bearing seats. Two rotary synchronous belts are provided and are respectively wound around the front and back synchronous pulleys. A synchronization rod is also provided between the left and right synchronous pulleys.

[0006] The first workstation device includes a first support, a first workstation plate, a first guide rail, and a first slider; wherein, at least two first guide rails are provided and are symmetrically fixed to the base in a front-back orientation; at least two first sliders are provided and are respectively fixedly connected to the left and right sides of the bottom of the first support; at least two first sliders are respectively slidably engaged with at least two first guide rails; the first support is provided with a first guide hole; the bottom of the first workstation plate is fixedly provided with a first longitudinal guide post and slides longitudinally guided by the first longitudinal guide post on the first guide hole; the first support or the first slider is provided with a first clamping member and is fixedly connected to the lower rotating layer of the rotary synchronous belt through the first clamping member; a first elastic member is also provided between the first support and the first workstation plate.

[0007] The first elastic element is a compression spring and is positioned and sleeved on the first longitudinal guide post. One end of the first elastic element acts elastically on the first bracket, and the other end acts elastically on the first workstation plate.

[0008] The second workstation device includes an extension frame, a second support, a second workstation plate, a second guide rail, and a second slider. At least two extension frames are symmetrically fixed to the base. At least two second guide rails are fixedly mounted on at least two extension frames, pointing forward and backward. Two second supports are symmetrically mounted. At least two second sliders are fixedly connected to the bottom of two second supports. At least two second sliders slide against at least two second guide rails. A second longitudinal guide post is fixedly mounted on the second support. The second workstation plate has a second guide hole and slides longitudinally along the second longitudinal guide post. A second clamping member is mounted on the second support or the second slider and is fixedly connected to the upper rotating layer of the rotary synchronous belt. A second elastic member is also provided between the second support and the second workstation plate.

[0009] The second elastic element is a tension spring. An elastic connecting frame is fixedly installed on the second longitudinal guide column. The second workstation plate is located between the second support and the elastic connecting frame. One end of the second elastic element is elastically connected to the second workstation plate, and the other end is elastically connected to the elastic connecting frame.

[0010] The first workstation plate and the second workstation plate are respectively provided with workstation openings, and cavity plates are installed and removed through the workstation openings. The cavity plates are provided with a plurality of cavities for storing welding materials.

[0011] A support member is fixedly installed on the base, and a fixed material plate is fixedly installed on the support member, and a plurality of material holes for storing welding materials are provided on it, the material holes corresponding to the cavity.

[0012] The reciprocating drive assembly includes a fixed base, and four fixed bases are provided and symmetrically fixed to the base in the front and back and left and right directions, respectively. A cylinder with a guide rod is provided between the front and back fixed bases, and the second bracket is fixedly engaged with the cylinder with the guide rod.

[0013] The pressing device includes a longitudinal frame, a pressing frame, and a longitudinal drive cylinder. Two longitudinal frames are provided and fixedly fixed to the base symmetrically. Each of the two longitudinal frames is fixedly provided with a vertically oriented lifting guide rail. Lifting sliders are fixedly provided on the left and right sides of the pressing frame, and the lifting sliders slide in cooperation with the lifting guide rails. The longitudinal drive cylinder is located between the two longitudinal frames and is fixedly provided on the base. The drive end of the longitudinal drive cylinder is fixedly cooperated with the pressing frame. The pressing frame is provided with a pressing opening corresponding to the workstation material plate. A light-transmitting plate is fixedly provided on the pressing opening, and several laser welding marks are provided on the light-transmitting plate.

[0014] This invention, through structural improvements, utilizes a reciprocating drive assembly and a rotary synchronous belt to enable the first and second workstations to slide linearly and interchangeably. This allows the workstation plates on both workstations to move in and out of the pressing device and the fixed plate in a coordinated manner. Because of the coordinated sliding of the two workstation plates, continuous feeding, laser welding, and unloading of welding materials can be achieved, improving production efficiency. Furthermore, the linear reciprocating sliding of the two workstation plates prevents vibration and shaking of the welding materials during transport, ensuring stable and high-precision transport. Additionally, the pressing device presses the workstation plates onto the fixed plate, allowing the welding materials on the workstation plates to effectively cooperate with those on the fixed plate, improving welding quality and ensuring a high pass rate for the finished welded products. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembly structure of an embodiment of the present utility model.

[0016] Figure 2 This is an exploded structural diagram of an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the synchronization device.

[0018] Figure 4 This is a schematic diagram of the assembly structure of the first workstation device.

[0019] Figure 5 This is a schematic diagram of the exploded structure of the first workstation device.

[0020] Figure 6 This is a schematic diagram of the assembly structure of the second workstation device.

[0021] Figure 7 This is a schematic diagram of the exploded structure of the second workstation device.

[0022] Figure 8 This is a schematic diagram of the assembly structure of the pressing device.

[0023] Figure 9 This is a schematic diagram of the exploded structure of the pressing device. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] See Figures 1-9 This sliding shuttle fixture for laser welding includes a base 1, on which a fixed material plate 2, a pressing device A, a synchronizing device B, a first station device C, and a second station device D are mounted. The pressing device A is mounted vertically on the same side as the fixed material plate 2. The synchronizing device B includes a rotary synchronous belt B1. The first station device C and the second station device D are respectively connected to the upper and lower rotating layers of the rotary synchronous belt B1. At least one station device is equipped with a reciprocating drive component E. The first station device C and the second station device D slide linearly and reciprocally between the pressing device A and the fixed material plate 2 through the interaction of the reciprocating drive component E and the rotary synchronous belt B1. The first station device C and the second station device D are also respectively equipped with station material plates that can be longitudinally reset. When the pressing device A presses down, it presses the station material plates onto the fixed material plate 2.

[0027] This embodiment utilizes the reciprocating drive component E and the rotary synchronous belt B1 to enable the first station device C and the second station device D to slide linearly and interchangeably. This allows the station material plates on the first station device C and the second station device D to move in and out of the pressing device A and the fixed material plate 2 in a linked manner. Due to the linked sliding of the two station material plates, continuous feeding, laser welding, and unloading of welding materials can be achieved, improving production efficiency. At the same time, the linear reciprocating sliding of the two station material plates can prevent vibration and shaking of the welding materials during the conveying process, ensuring stable and high-precision conveying of the welding materials. In addition, the pressing device A can press the station material plate onto the fixed material plate 2, so that the welding materials on the station material plate and the welding materials on the fixed material plate 2 can be effectively matched, thereby improving the welding quality of the welding materials and ensuring the pass rate of the welded products.

[0028] The synchronization device B also includes bearing seats B2. There are four bearing seats B2, which are fixed symmetrically on the base 1 in the front and back and left and right. Synchronous pulleys B3 are rotatably mounted on the four bearing seats B2. There are two rotary synchronous belts B1, which are wound around the front and back synchronous pulleys B3 respectively. A synchronization rod B4 is also provided between the left and right synchronous pulleys B3.

[0029] In this embodiment, the left and right synchronous pulleys B3 rotate synchronously through the synchronous rod B4, so that the left and right rotary synchronous belts B1 can rotate step by step, ensuring the sliding stability of the first station device C and the second station device D.

[0030] The first workstation device C includes a first support C1, a first workstation plate C2, a first guide rail C3, and a first slider C4. At least two first guide rails C3 are symmetrically fixed to the base 1, pointing forward and backward. At least two first sliders C4 are fixedly connected to the left and right sides of the bottom of the first support C1, respectively. At least two first sliders C4 slide against at least two first guide rails C3. The first support C1 has a first guide hole. The bottom of the first workstation plate C2 has a first longitudinal guide post fixedly installed, and the first guide post guides the slider longitudinally through the first guide hole. The first support C1 or the first slider C4 has a first clamping member C5, which is fixedly connected to the lower rotating layer of the rotary synchronous belt B1. A first elastic member C6 is also installed between the first support C1 and the first workstation plate C2.

[0031] In this embodiment, two first guide rails C3 and two first sliders C4 are provided. By using two first guide rails C3 and two first sliders C4 that slide and cooperate with each other, the front and rear sliding stability of the first bracket C1 can be improved. In addition, by using the longitudinal guiding cooperation of the first longitudinal guide post and the first guide hole, the longitudinal sliding stability of the first workstation plate C2 can be improved.

[0032] The first elastic element C6 is a compression spring and is positioned and sleeved on the first longitudinal guide post. One end of the first elastic element C6 acts elastically on the first bracket C1, and the other end acts elastically on the first workstation plate C2.

[0033] In this embodiment, the first workstation plate C2 always slides elastically in the direction away from the first support C1 by the elastic force of the first elastic element C6; when the pressing device A presses down, it will drive the first workstation plate C2 to overcome the elastic force of the first elastic element C6 and slide longitudinally in the direction of the fixed material plate 2.

[0034] The second workstation device D includes an extension frame D1, a second support D2, a second workstation plate D3, a second guide rail D4, and a second slider D5. At least two extension frames D1 are symmetrically fixed to the base 1. At least two second guide rails D4 are fixedly mounted on at least two extension frames D1, pointing forward and backward. Two second supports D2 are symmetrically arranged. At least two second sliders D5 are fixedly connected to the bottom of two second supports D2 respectively. Block D5 is slidably engaged with at least two second guide rails D4. A second longitudinal guide post D6 is fixedly installed on the second bracket D2. A second guide hole D7 is provided on the second workstation plate D3, and the second guide post D6 is slidably guided by the second guide hole D7. A second clamping member D8 is provided on the second bracket D2 or the second slider D5, and the second clamping member D8 is fixedly connected to the upper rotating layer of the rotary synchronous belt B1. A second elastic member D9 is also provided between the second bracket D2 and the second workstation plate D3.

[0035] In this embodiment, the second guide rail D4 is supported by the height-increasing frame D1, making the overall height of the second workstation device D higher than that of the first workstation device C. This creates a height difference between the first workstation device C and the second workstation device D, allowing for exchangeable linear reciprocating sliding. Two second guide rails D4 and two second sliders D5 are provided. The mutual sliding cooperation of the two second guide rails D4 and second sliders D5 improves the front-to-back sliding stability of the two second supports D2. Furthermore, the second workstation plate D3 can be used as a synchronizing element between the two second supports D2, enabling them to slide synchronously back and forth. The longitudinal guiding cooperation of the second longitudinal guide post D6 and the second guide hole D7 improves the longitudinal sliding stability of the second workstation plate D3.

[0036] The second elastic element D9 is a tension spring. An elastic connecting frame D10 is fixedly installed on the second longitudinal guide column D6. The second workstation plate D3 is located between the second support D2 and the elastic connecting frame D10. One end of the second elastic element D9 is elastically connected to the second workstation plate D3, and the other end is elastically connected to the elastic connecting frame D10.

[0037] In this embodiment, the second workstation plate D3 always slides elastically longitudinally away from the second support D2 by the elastic force of the second elastic element D9; when the pressing device A presses down, it will drive the second workstation plate D3 to overcome the elastic force of the second elastic element D9 and slide longitudinally towards the fixed material plate 2.

[0038] The first workstation plate C2 and the second workstation plate D3 are respectively provided with workstation openings 3, and cavity plates 4 are installed and removed through the workstation openings 3. The cavity plates 4 are provided with several cavities 5 for storing welding materials.

[0039] In this embodiment, a positioning step is provided on the workstation opening 3. The cavity plate 4 is positioned on the workstation opening 3 by the positioning step during assembly. A notch is provided on the cavity plate 4. The cavity plate 4 is removed from the workstation opening 3 by the notch during disassembly.

[0040] A support member 6 is fixedly installed on the base 1. A fixed material plate 2 is fixedly installed on the support member 6 and has several material holes for storing welding materials. The material holes correspond to the cavity 5. Users can place the two materials to be welded on the material holes and the cavity 5 respectively.

[0041] In this embodiment, the support member 6 provides support for the fixed plate 2, so that the fixed plate 2 can be close to the pressing device A and stably set on the base 1.

[0042] The reciprocating drive assembly E includes a fixed base E1. Four fixed bases E1 are provided and are symmetrically fixed to the base 1 in the front and back and left and right. A cylinder E2 with a guide rod is provided between the front and back fixed bases E1. The second bracket D2 is fixedly engaged with the cylinder E2 with the guide rod.

[0043] In this embodiment, two guide rod cylinders E2 are respectively driven and connected to two second supports D2, so that when the guide rod cylinders E2 are working, they can drive the second supports D2 to slide. When the second supports D2 are sliding, the second clamping member D8 drives the rotary synchronous belt B1 to rotate. When the rotary synchronous belt B1 rotates, the first clamping member C5 simultaneously drives the first support C1 to slide, so as to realize the exchange linear reciprocating sliding of the first station device C and the second station device D.

[0044] In this embodiment, the base 1 is also provided with front and rear buffer brackets 8 and position sensing brackets 10. The front and rear buffer brackets 8 are respectively provided with front and rear buffers 9, the position sensing brackets 10 are provided with position sensors, and the second bracket D2 is provided with position sensing mating parts 11.

[0045] When the second support D2 slides back and forth, it interacts with the position sensor through the position sensing mating part 11 to sense the back and forth sliding position of the first station device C and the second station device D. When the second support D2 slides back and forth to the end position, it interacts with the front and rear buffers 9 to buffer the sliding of the second support D2, thereby further reducing the vibration and shaking of the first station device C and the second station device D during sliding, and at the same time limiting the back and forth sliding position of the first station device C and the second station device D.

[0046] The pressing device A includes a longitudinal frame A1, a pressing frame A2, and a longitudinal drive cylinder A3. There are two longitudinal frames A1, which are symmetrically fixed on the base 1. The two longitudinal frames A1 are respectively fixed with vertically pointing lifting guide rails A4. The pressing frame A2 is respectively fixed with lifting sliders A5 on the left and right sides. The lifting sliders A5 and the lifting guide rails A4 slide against each other. The longitudinal drive cylinder A3 is located between the two longitudinal frames A1 and is fixed on the base 1. The driving end of the longitudinal drive cylinder A3 is fixedly engaged with the pressing frame A2. The pressing frame A2 is provided with a pressing opening A6 corresponding to the work station material plate. A light-transmitting plate A7 is fixedly provided on the pressing opening A6. Several laser welding marks A8 are provided on the light-transmitting plate A7.

[0047] In this embodiment, when the longitudinal drive cylinder A3 is working, it drives the lower pressure frame A2 to slide up and down on the lifting guide rail A4 of the longitudinal frame A1 via the lifting slider A5. This not only ensures that the lower pressure frame A2 can slide up and down stably, but also that the lower pressure frame A2 can press the first work station plate C2 and the second work station plate D3 onto the fixed material plate 2 when it slides down, so that the welding material on the cavity plate 4 can come into contact with the welding material on the fixed material plate 2.

[0048] The laser welding machine is located above the pressing device A. When it is working, the laser emitted by it passes through the light-transmitting plate A7 and can laser weld the welding materials. In addition, the laser welding mark A8 makes it easy for users to observe the working path of the laser, and also makes it easy for the welding materials on the cavity plate 4 to align with the welding materials on the fixed material plate 2, ensuring the accuracy of laser welding.

[0049] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A sliding shuttle fixture for laser welding, comprising a base (1), characterized in that: The base (1) is provided with a fixed material plate (2), a pressing device (A), a synchronizing device (B), a first station device (C), and a second station device (D); wherein, the pressing device (A) is arranged vertically on the same side as the fixed material plate (2), the synchronizing device (B) includes a rotary synchronous belt (B1), the first station device (C) and the second station device (D) are respectively connected to the rotary synchronous belt (B1) in a rotary upper and lower layer, and at least one station device is provided with a reciprocating drive assembly (E), the first station device (C) and the second station device (D) slide linearly and reciprocally between the pressing device (A) and the fixed material plate (2) through the cooperation of the reciprocating drive assembly (E) and the rotary synchronous belt (B1), and the first station device (C) and the second station device (D) are also respectively provided with a station material plate that can be longitudinally reset, and the pressing device (A) presses the station material plate onto the fixed material plate (2) when pressing down.

2. The sliding shuttle fixture for laser welding according to claim 1, characterized in that: The synchronization device (B) also includes bearing seats (B2), four bearing seats (B2) are provided and fixed symmetrically on the base (1) in the front and back and left and right respectively. Synchronous pulleys (B3) are rotatably provided on the four bearing seats (B2). Two rotary synchronous belts (B1) are provided and are respectively wound around the front and back synchronous pulleys (B3). A synchronization rod (B4) is also provided between the left and right synchronous pulleys (B3).

3. The sliding shuttle fixture for laser welding according to claim 1, characterized in that: The first workstation device (C) includes a first support (C1), a first workstation plate (C2), a first guide rail (C3), and a first slider (C4); wherein, at least two first guide rails (C3) are provided and are fixedly fixed to the base (1) in a left-right symmetrical manner pointing forward and backward; at least two first sliders (C4) are provided and are respectively fixedly connected to the left and right sides of the bottom of the first support (C1); at least two first sliders (C4) are respectively slidably engaged with at least two first guide rails (C3); a first guide hole is provided on the first support (C1); a first longitudinal guide post is fixedly provided at the bottom of the first workstation plate (C2) and slides longitudinally guided on the first guide hole through the first longitudinal guide post; a first clamping member (C5) is provided on the first support (C1) or the first slider (C4) and is fixedly connected to the lower rotating layer of the rotary synchronous belt (B1) through the first clamping member (C5); a first elastic member (C6) is also provided between the first support (C1) and the first workstation plate (C2).

4. The sliding shuttle fixture for laser welding according to claim 3, characterized in that: The first elastic element (C6) is a compression spring and is positioned and sleeved on the first longitudinal guide post. One end of the first elastic element (C6) acts elastically on the first bracket (C1), and the other end acts elastically on the first workstation plate (C2).

5. The sliding shuttle fixture for laser welding according to claim 3, characterized in that: The second workstation device (D) includes a riser (D1), a second support (D2), a second workstation plate (D3), a second guide rail (D4), and a second slider (D5); wherein, at least two risers (D1) are provided and fixedly fixed to the base (1) in a left-right symmetrical manner; at least two second guide rails (D4) are provided and fixedly fixedly mounted on at least two risers (D1) in a front-back direction; two second supports (D2) are provided and symmetrically mounted; at least two second sliders (D5) are provided and fixedly connected to the bottom of two second supports (D2) respectively; and at least two second sliders (D5) are provided. The second bracket (D2) is fixedly provided with a second longitudinal guide post (D6) and a second guide hole (D7) is provided on the second station plate (D3), and the second guide post (D6) is longitudinally guided and slidable through the second guide hole (D7). The second bracket (D2) or the second slider (D5) is provided with a second clamping member (D8), and the second clamping member (D8) is fixedly connected to the upper rotating layer of the rotary synchronous belt (B1). A second elastic member (D9) is also provided between the second bracket (D2) and the second station plate (D3).

6. The sliding shuttle fixture for laser welding according to claim 5, characterized in that: The second elastic element (D9) is a tension spring. An elastic connecting frame (D10) is fixedly installed on the second longitudinal guide column (D6). The second workstation plate (D3) is located between the second bracket (D2) and the elastic connecting frame (D10). One end of the second elastic element (D9) is elastically connected to the second workstation plate (D3), and the other end is elastically connected to the elastic connecting frame (D10).

7. The sliding shuttle fixture for laser welding according to claim 5, characterized in that: The first work station plate (C2) and the second work station plate (D3) are respectively provided with work station openings (3), and cavity plates (4) are installed and removed through the work station openings (3). The cavity plates (4) are provided with a number of cavities (5) for storing welding materials.

8. The sliding shuttle fixture for laser welding according to claim 7, characterized in that: A support member (6) is fixedly installed on the base (1), and a fixed material plate (2) is fixedly installed on the support member (6) and has a number of material holes for storing welding materials. The material holes correspond to the cavity (5).

9. The sliding shuttle fixture for laser welding according to claim 5, characterized in that: The reciprocating drive assembly (E) includes a fixed base (E1), and four fixed bases (E1) are provided and are symmetrically fixed to the base (1) in front and behind and left and right respectively. A cylinder (E2) with a guide rod is provided between the front and back fixed bases (E1), and the second bracket (D2) is fixedly engaged with the cylinder (E2).

10. The sliding shuttle fixture for laser welding according to claim 1, characterized in that: The pressing device (A) includes a longitudinal frame (A1), a pressing frame (A2), and a longitudinal drive cylinder (A3). There are two longitudinal frames (A1), which are symmetrically fixed on the base (1). The two longitudinal frames (A1) are respectively fixed with vertically pointing lifting guide rails (A4). The pressing frame (A2) is respectively fixed with lifting sliders (A5) on the left and right sides. The lifting sliders (A5) and the lifting guide rails (A4) slide with each other. The longitudinal drive cylinder (A3) is located between the two longitudinal frames (A1) and is fixed on the base (1). The driving end of the longitudinal drive cylinder (A3) is fixedly engaged with the pressing frame (A2). The pressing frame (A2) is provided with a pressing opening (A6) corresponding to the work station material plate. A light-transmitting plate (A7) is fixedly provided on the pressing opening (A6). A number of laser welding marks (A8) are provided on the light-transmitting plate (A7).

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