Self-positioning flexible clamp

Abstract

A plurality of guide rods are connected to the upper portion of a base, a manipulator connecting plate is fixed to the upper portions of the guide rods, a guide shaft is fixed to the lower portion of the base through a T-shaped fixing base and a side fixing base together, a pressing cylinder is fixed to one end of the T-shaped fixing base and connected with a clamping hand, an elastic piece is arranged on the guide shaft, and one end of the base is connected with a suction cup. The two pressing cylinders are self-positioned through elastic pieces, self-positioning adjustment is automatically conducted through elasticity of the elastic pieces at the moment when the clamping jaw touches a product by means of power, it is ensured that the clamping jaw can be tightly attached to the product, and the clamping jaw is not prone to falling or deforming; the pressing cylinder is combined with the suction cup, so that the clamping device is more stable when the objects are clamped.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fixture technical field, especially a self -positioning flexible fixture. BACKGROUND

[0002] The fixture cannot be designed and manufactured to be accurate to the millimeter according to the spacing of the product in the design drawing, and the product itself is made of PVC material and has a certain deformability, so the synchronous clamping jaw always has the phenomenon that one side collides with the stop board and the other side is suspended, which affects the stability and consistency of the product clamping.

[0003] In the prior art, a self-positioning flexible air bag clamp disclosed in patent publication No. CN207267256U includes a four-bar linkage mechanism, a horizontally arranged connecting plate, a vertically arranged air cylinder on the connecting plate, and a sleeve frame on the output end of the air cylinder. The four-bar linkage mechanism includes a driving rod, an inclined rod, and a claw rod. The lower end of the claw rod is provided with an air bag. The side of the air bag close to the sleeve frame is provided with a rubber pad. The rubber pad is embedded with a sensor. The clamp further includes a controller connected with the air cylinder by an electrical signal and a remote controller connected with the controller by a wireless signal. The beneficial effect is that when the sensor senses the workpiece, the controller can control the air cylinder to work to automatically position and clamp the workpiece. Since the sensor is fixed with the rubber pad and is in a non-fixed state with the air bag, the sensor will not protrude from the rubber pad and hard contact the surface of the workpiece after the air bag is squeezed. The structure of the comparative technology is not stable, and the air bag alone cannot realize the self-positioning function, and the clamping effect is not good. UTILITY MODEL CONTENTS

[0004] The utility model discloses a self -positioning flexible fixture, which is simple in structure, easy to disassemble and maintain, and stable in clamping.

[0005] Another object of the utility model is to solve the problem of the existing clamp that has a certain deformability when clamping, and the clamping hand always has the phenomenon that one side collides with the clamped object and the other side is suspended, which affects the stability and consistency of the product clamping. The utility model is provided with an elastic member, and a self-positioning flexible clamp is provided.

[0006] To achieve the above object, the utility model provides the following technical scheme: a self-positioning flexible clamp, a plurality of guide rods are connected above the base, a mechanical hand connecting plate is fixed above the guide rods, a guide shaft is fixed by a T-shaped fixed base and a side fixed base below the base, one end of the T-shaped fixed base is fixed with a pressure cylinder, the pressure cylinder is connected with a clamping hand, an elastic member is arranged on the guide shaft, and a suction cup is connected to one end of the base.

[0007] As a preferred, one side of the pressure cylinder is a connecting rod, and the connecting rod is connected with a fixed disc.

[0008] As preferred, the fixed disc clamps the hand, and the clamping hand is L-shaped.

[0009] As preferred, one side of the base is a suction disc fastener, and the suction disc fastener is connected with a suction disc connecting rod.

[0010] As preferred, the suction disc connecting rod fixes the suction disc, and the suction disc clamps the object.

[0011] As preferred, the base is long strip-shaped, and a hollow groove is arranged in the middle of the base, and the hollow groove positions the T-shaped fixing seat.

[0012] As preferred, the elastic member is arranged between the T-shaped fixing seat and the side fixing seat.

[0013] As preferred, the side fixing seat is arranged at the end of the guide shaft, and a gasket is arranged between the end of the guide shaft and the side fixing seat.

[0014] Compared with the prior art, the beneficial effects of the utility model are that: two pressing cylinders of the utility model are self-positioning with elastic members, and rely on power, and the clamping jaw is automatically self-positioned and adjusted by the elasticity of the elastic member in a moment of colliding with a product, so that the clamping jaw can tightly adhere to the product, the product is not easy to fall or deform, and the accuracy of the position of the subsequent boxing is ensured; the pressing cylinder and the suction disc are combined, and the object is clamped more stably. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model.

[0016] Figure 2 It is a partial enlarged view C of the utility model.

[0017] Figure 3 It is a structural plan view of the utility model.

[0018] Figure 4 It is a structural sectional view A-A of the utility model.

[0019] In the drawing: 1, mechanical hand connecting plate; 2, guide rod; 3, base; 4, hollow groove; 5, suction disc fastener; 6, suction disc connecting rod; 7, suction disc; 8, clamped object; 9, end of guide shaft; 10, gasket; 11, elastic member; 12, fixed disc; 13, clamping hand; 14, T-shaped fixing seat; 15, guide shaft; 16, connecting rod; 17, pressing cylinder; 18, side fixing seat. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be further described in detail below by specific embodiments, and the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0021] Embodiment 1: refer to Figures 1 to 4A self-positioning flexible clamp, the base 3 supports the weight of the entire clamp and the forces generated during operation. The base 3 is usually made of high-strength materials to ensure stability under high loads and frequent use. Above the base 3 are designed with multiple guide rods 2, these guide rods 2 not only provide the stability required by the clamp, but also define the movement path of the robotic arm, ensuring that the clamp can accurately reach the predetermined working position. The design of the guide rod 2 allows the clamp to be fine-tuned in multiple directions to adapt to different working scenarios.

[0022] The mechanical hand connecting plate 1 is the interface between the clamp and the robotic arm, its design must be able to withstand the force exerted by the robotic arm, while ensuring the reliability of the connection. The connecting plate 1 is usually equipped with a standardized interface to facilitate compatibility with different types of robotic arms. This design allows the clamp to be quickly replaced or upgraded to adapt to different work tasks.

[0023] The T-shaped fixed seat 14 is a T-shaped structure, this structure can provide strong support force without adding too much weight. The cross-section of the T-shaped fixed seat 14 is designed in the shape of T, where the vertical part is used to fix the guide shaft 15, and the horizontal part expands enough space to fix the pressure cylinder 17. This design allows the clamp to remain stable when subjected to large loads, while reducing the risk of damage caused by uneven pressure or heavy object offset. The side fixed seat 18 works in conjunction with the T-shaped fixed seat 14 to provide additional lateral support. This design helps to disperse the load and prevent the guide shaft 15 from being offset under lateral force. The side fixed seat 18 is usually made of high-strength materials to ensure that it will not deform or break during the operation of the clamp.

[0024] The guide shaft 15 allows the clamp to rotate and position in multiple directions, which is crucial for precise operation in complex or variable working environments. The guide shaft 15 is usually made of wear-resistant materials to ensure accuracy and reliability even after long-term use. The T-shaped fixed seat 14 and the side fixed seat 18 are fixed on the base 3 by bolts, welding or other mechanical connections. This connection must be able to withstand high torque and shear force to ensure that it does not loosen or fall off during clamp operation. To ensure that the clamp can adapt to different working environments and requirements, the T-shaped fixed seat 14 and the side fixed seat 18 are designed to allow fine tuning. This adjustment can be achieved by changing the tightening of the bolts on the fixed seat or using adjustable connections. In addition, the design of these fixed seats also considers the convenience of maintenance, so that worn parts can be quickly replaced when needed. When designing the T-shaped fixed seat 14 and the side fixed seat 18, particular attention is paid to the uniformity of load distribution. This uniform distribution helps to reduce stress concentration on individual components, thereby improving the overall durability and reliability of the clamp. This structural design also takes into account compatibility and scalability with other automation components. The T-shaped fixed seat 14 and the side fixed seat 18 can be used with other types of guide systems or additional components to meet the needs of specific applications.

[0025] The pressure cylinder 17 is the power source of the clamp, which can be a pneumatic or hydraulic device, and the specific choice depends on the application scenario and the size of the required force. The design of the pressure cylinder 17 must be able to provide stable and controllable force output to ensure that the clamp hand 13 can accurately clamp and release objects. The pressure cylinder 17 is connected to the connecting rod 16 on one side, which further enhances the stability and force transmission efficiency of the clamp.

[0026] The elastic member 11 is an important design on the guide shaft 15, which can be a spring or other elastic material. The role of the elastic member 11 is to provide the necessary elastic support during clamp operation, which realizes the self-positioning function of the scheme. The two pressure cylinders of the utility model are self-positioning with elastic members, relying on power, the moment the clamp jaw touches the product, it automatically adjusts the self-positioning relying on the elasticity of the elastic member, ensures that the clamp jaw can tightly adhere to the product, makes it not easy to fall or deform, ensures the accuracy of the subsequent boxing position, which makes the clamp can adapt to different size and shape of objects, at the same time reduces the operation error caused by the size difference of objects.

[0027] The suction cup 7 is another key component of the clamp, allowing it to secure objects through suction, particularly suitable for smooth or non-invasive operating environments. The design of the suction cup 7 must be able to provide sufficient suction force to ensure stable clamping of objects under various working conditions. The fixing disc 12 is fixedly connected to the connecting rod 16, and also clamps the clamp hand 13, which ensures the stability and accuracy of the clamp hand during operation. The fixing disc 12 is usually made of high-strength materials to withstand the force generated by the clamp hand 13 when clamping objects.

[0028] The L-shaped clamping design of the clamp hand 13 allows it to clamp objects more stably, while also facilitating positioning and operation. This design allows the clamp hand 13 to be quickly adjusted in different working scenarios to adapt to different object shapes and sizes. The design of the suction cup fastener 5 and the suction cup connecting rod 6 allows the suction cup 7 to be more stably connected to the clamp, while also facilitating adjustment and maintenance. This design ensures that the suction cup 7 can maintain stable suction force under high load and frequent use.

[0029] Overall, the design of this self-positioning flexible clamp takes into account the flexibility, stability and adaptability of operation, making it widely applicable to various automated and robotic arm operating scenarios. Through the driving of the pneumatic or hydraulic cylinder 17, the clamp can accurately clamp and release objects, while the design of the elastic element 11 and the suction cup 7 further improves the adaptability of the clamp and the convenience of operation.

[0030] Example 2: Reference Figures 1 to 4 A self-positioning flexible clamp, the base 3 is designed with multiple guide rods 2 on the top, which not only ensure the stability of the clamp, but also plan the movement trajectory for the robotic arm, ensuring that the clamp can accurately reach the target working position. The design of the guide rod 2 allows the clamp to be fine-tuned in multiple directions to adapt to changing work requirements.

[0031] The robot connecting plate 1 is a key component of the clamp connected to the robotic arm, which must be able to withstand the force exerted by the robotic arm and ensure the stability of the connection. The connecting plate 1 is usually equipped with a standardized interface to be compatible with multiple types of robotic arms. Such a design allows the clamp to be quickly replaced or upgraded to adapt to diverse work requirements.

[0032] The T-shaped fixing base 14 provides strong support without adding excessive weight due to its T-shaped structure. The cross-section of the T-shaped fixing base 14 is T-shaped, with the vertical part used to fix the guide shaft 15 and the horizontal part providing sufficient space for the fixing of the pressure cylinder 17. This design makes the clamp stable even under heavy loads and reduces the risk of damage caused by uneven pressure or the displacement of heavy objects. The side fixing base 18 works in conjunction with the T-shaped fixing base 14 to provide additional lateral support, helping to distribute the load and prevent the guide shaft 15 from being displaced under lateral forces. The side fixing base 18 is usually made of high-strength materials to ensure stability and durability during the operation of the clamp.

[0033] The design of the guide shaft 15 allows the clamp to rotate and position in multiple directions, which is crucial for precise operations in complex or variable work environments. The guide shaft 15 is usually made of wear-resistant materials to ensure accuracy and reliability even after long-term use. The T-shaped fixing base 14 and the side fixing base 18 are fixed to the base 3 through bolts, welding, or other mechanical connections that must be able to withstand high torque and shear forces to ensure the stability of the clamp during operation. To adapt to different work environments and requirements, the design of the T-shaped fixing base 14 and the side fixing base 18 allows for fine-tuning, which can be achieved by adjusting the tightness of the bolts or using adjustable connectors. The design of these fixing bases also considers the convenience of maintenance, allowing for quick replacement of worn parts when needed. In the design of the T-shaped fixing base 14 and the side fixing base 18, particular attention is paid to the uniformity of load distribution, which helps to reduce stress concentration on individual components and improve the overall durability and reliability of the clamp. In addition, this structural design also considers compatibility and scalability with other automation components, and the T-shaped fixing base 14 and the side fixing base 18 can be used with other types of guide systems or additional components to meet the needs of specific applications.

[0034] The pressure cylinder 17, as the power source of the clamp, can be a pneumatic or hydraulic device, and the specific choice depends on the application scenario and the size of the required force. The design of the pressure cylinder 17 must be able to provide stable and controllable force output to ensure that the clamping hand 13 can accurately clamp and release objects. The pressure cylinder 17 is connected to the connecting rod 16 on one side, which further enhances the stability and force transmission efficiency of the clamp. The elastic element 11 is an important design element on the guide shaft 15 and can be made of springs or other elastic materials. The function of the elastic element 11 is to provide the necessary elastic support during the operation of the clamp to achieve self-positioning. The two pressure cylinders of the utility model have elastic elements and rely on power. When the clamping jaw contacts the product, it automatically adjusts the position by relying on the elasticity of the elastic element, ensuring that the clamping hand 13 can tightly adhere to the product, preventing it from falling or deforming, and ensuring the accuracy of subsequent packaging. This allows the clamp to adapt to objects of different sizes and shapes while reducing operational errors caused by differences in object sizes.

[0035] The suction cup 7 is another key component of the clamp, allowing it to secure objects through the means of suction, particularly suitable for smooth or non-invasive operating environments. The design of the suction cup 7 must be able to provide sufficient suction force to ensure stable clamping of objects under various working conditions. The fixed disc 12 is fixedly connected to the connecting rod 16 and clamps the clamp hand 13, which ensures the stability and accuracy of the clamp hand during operation. The fixed disc 12 is usually made of high-strength materials to withstand the force generated by the clamp hand 13 when clamping objects. The L-shaped clamping design of the clamp hand 13 allows it to clamp objects more stably, while also facilitating positioning and operation. This design allows the clamp hand 13 to be quickly adjusted in different working scenarios to adapt to different object shapes and sizes. The design of the suction cup fastener 5 and the suction cup connecting rod 6 allows the suction cup 7 to be more stably connected to the clamp, while also facilitating adjustment and maintenance. This design ensures that the suction cup 7 can maintain stable suction force under high load and frequent use.

[0036] The suction cup connecting rod 6 is an important component that connects the base 3 and the suction cup 7, and is usually made of high-strength, lightweight materials to ensure that the connecting rod 6 does not bend or break when bearing the weight of the suction cup 7 and the object 8 it is suctioning. The length and angle of the suction cup connecting rod 6 can be adjusted to accommodate objects 8 of different sizes and shapes, ensuring that the suction cup 7 can accurately suction to the surface of the object 8. In addition, the design of the suction cup connecting rod 6 also considers the convenience of operation, allowing the suction cup 7 to be quickly installed and removed for easy maintenance and replacement.

[0037] The base 3 is designed in a long strip shape, which provides good stability and support while occupying less space, making it suitable for use in compact working environments. The middle of the base 3 is provided with a hollow groove 4, which is not only a structural design but also a functional innovation. It is used to position the T-shaped fixed seat 14, ensuring that the fixed seat 14 is accurately positioned on the base 3. The design of the hollow groove 4 allows the T-shaped fixed seat 14 to be quickly positioned and fixed on the base 3, while also providing space for the arrangement of cables or pipes, making the wiring of the entire clamp more tidy and orderly.

[0038] The size and shape of the hollow groove 4 match the T-shaped fixed seat 14, ensuring that the fixed seat 14 can be stably installed on the base 3 and will not be displaced by external forces. This precise fit also helps to improve the overall rigidity and durability of the clamp. In addition, the design of the hollow groove 4 also takes into account the factors of heat dissipation and weight reduction, reducing the use of materials through hollow design, while not affecting the structural strength of the base 3.

[0039] In summary, the combination of the suction cup connecting rod 6 and the suction cup 7, along with the design of the base 3 and the hollow groove 4, forms the core features of this self-positioning flexible clamp. These designs not only improve the operational efficiency and stability of the clamp, but also enhance its adaptability and durability, enabling it to perform excellently in various automated and robotic arm operation scenarios.

[0040] Example 3: Reference Figures 1 to 4 The base 3 forms the solid foundation of the clamp, responsible for supporting the weight of the entire device and the forces generated during operation. To ensure stability under heavy pressure and frequent use, the base 3 is usually made of high-strength materials. On the top of the base 3, multiple guide rods 2 are equipped, which not only provide the required stability for the clamp, but also plan the movement path for the robotic arm, ensuring that the clamp can accurately reach the predetermined working position. The design of the guide rods 2 allows the clamp to be fine-tuned in multiple directions to adapt to changing work requirements.

[0041] The robotic arm connecting plate 1 is a key connecting component between the clamp and the robotic arm, which must be able to withstand the force exerted by the robotic arm and ensure the stability of the connection. The connecting plate 1 is usually equipped with a standardized interface to be compatible with multiple types of robotic arms. Such design allows the clamp to be quickly replaced or upgraded to adapt to diverse work requirements.

[0042] The T-shaped fixed seat 14 provides strong support without adding excessive weight due to its T-shaped structure. The cross-section of the T-shaped fixed seat 14 is T-shaped, where the vertical part is used to fix the guide shaft 15, and the horizontal part provides enough space for the fixed pressure cylinder 17. This design makes the clamp stable when bearing large loads and reduces the risk of damage caused by uneven pressure or heavy object deviation. The side fixed seat 18 works in conjunction with the T-shaped fixed seat 14 to provide additional lateral support, helping to distribute the load and prevent the guide shaft 15 from deviating under lateral force. The side fixed seat 18 is usually made of high-strength materials to ensure stability and durability during the operation of the clamp.

[0043] The design of the guide shaft 15 allows the clamp to rotate and position in multiple directions, which is crucial for precise operations in complex or variable work environments. The guide shaft 15 is usually made of wear-resistant materials to ensure accuracy and reliability over long-term use. The T-shaped fixed seat 14 and the side fixed seat 18 are fixed on the base 3 by bolts, welding or other mechanical connections, which must be able to withstand high torque and shear force to ensure the stability of the clamp during operation. To adapt to different work environments and requirements, the T-shaped fixed seat 14 and the side fixed seat 18 are designed to allow fine-tuning, which can be achieved by adjusting the tightening of the bolts or using adjustable connections. The design of these fixed seats also considers the convenience of maintenance, so that worn parts can be quickly replaced when needed. In the design of the T-shaped fixed seat 14 and the side fixed seat 18, the uniformity of load distribution is particularly considered, which helps to reduce stress concentration on individual components and improve the overall durability and reliability of the clamp. In addition, this structural design also considers compatibility and scalability with other automation components, and the T-shaped fixed seat 14 and the side fixed seat 18 can be used with other types of guide systems or additional components to meet the needs of specific applications.

[0044] The pressure cylinder 17 serves as the power source of the clamp, which can be a pneumatic or hydraulic device, and the specific choice depends on the application scenario and the size of the required force. The design of the pressure cylinder 17 must be able to provide stable and controllable force output to ensure that the clamp hand 13 can accurately clamp and release objects. The pressure cylinder 17 is connected to the connecting rod 16 on one side, which further enhances the stability and force transmission efficiency of the clamp.

[0045] The elastic element 11 can be made of springs or other elastic materials. The function of the elastic element 11 is to provide the necessary elastic support during the operation of the clamp to achieve self-positioning. The two pressure cylinders of the utility model have elastic elements, which rely on power to automatically adjust the self-positioning of the clamp jaw when it contacts the product, ensuring that the clamp jaw can tightly adhere to the product, preventing it from falling or deforming, and ensuring the accuracy of subsequent packaging. This allows the clamp to adapt to objects of different sizes and shapes, while reducing operation errors caused by differences in object size.

[0046] The suction cup 7 allows the clamp to fix objects by suction, which is particularly suitable for smooth or non-invasive operating environments. The design of the suction cup 7 must be able to provide sufficient suction force to ensure stable clamping of objects under various working conditions. The fixing disc 12 is fixedly connected to the connecting rod 16 and clamped to the clamp hand 13, which ensures the stability and accuracy of the clamp hand during operation. The fixing disc 12 is usually made of high-strength material to withstand the force generated by the clamp hand 13 when clamping objects. The L-shaped clamping design of the clamp hand 13 allows it to clamp objects more stably, while also facilitating positioning and operation. This design allows the clamp hand 13 to be quickly adjusted in different working scenarios to adapt to different object shapes and sizes. The design of the suction cup fastener 5 and the suction cup connecting rod 6 allows the suction cup 7 to be more stably connected to the clamp, while also facilitating adjustment and maintenance.

[0047] The elastic member 11 is placed between the T-shaped fixing seat 14 and the side fixing seat 18, which aims to utilize the elastic properties of the elastic member 11 to provide dynamic adaptability of the clamp during operation. The elastic member 11, such as a spring or other elastic material, can absorb shocks and vibrations when the clamp is subjected to external forces, reducing damage to the clamp structure, while providing a certain pre-tightening force to ensure that the various components of the clamp can fit tightly. In addition, the arrangement of the elastic member 11 also helps the clamp to automatically adjust the clamping force when clamping objects of different sizes and shapes, achieving more accurate and stable clamping effect.

[0048] The side fixing seat 18 is located at the position of the guide shaft end 9, which can effectively support the guide shaft 15 and maintain its stability under high load. Between the guide shaft end 9 and the side fixing seat 18, a gasket 10 is designed. The main function of the gasket 10 is to reduce direct contact between the guide shaft 15 and the side fixing seat 18, thereby reducing wear and noise and providing additional cushioning. The gasket 10 is usually made of wear-resistant materials such as rubber or polytetrafluoroethylene (PTFE), which have good friction-reducing properties and chemical corrosion resistance, and can maintain stable performance in various working environments. The arrangement of the gasket 10 also helps to absorb the impact force transmitted by the guide shaft 15 when the clamp is operated quickly or frequently, protecting the structural integrity of the clamp and prolonging its service life. In addition, the replaceability of the gasket 10 also makes maintenance work more convenient, and once it is worn out, it can be quickly replaced to ensure the continuous and efficient operation of the clamp.

[0049] The utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the utility model, for those skilled in the art.

Claims

1. A self-positioning flexible clamp, characterized in that, Several guide rods (2) are connected above the base (3). A robot arm connecting plate (1) is fixed above the guide rods. The guide shaft (15) is fixed below the base (3) by a T-shaped fixing seat (14) and a side fixing seat (18). A pressure cylinder (17) is fixed at one end of the T-shaped fixing seat (14). The pressure cylinder (17) is connected to a gripper (13). An elastic element (11) is provided on the guide shaft (15). A suction cup (7) is connected to one end of the base (3).

2. The self-positioning flexible clamp according to claim 1, characterized in that, One side of the pressure cylinder (17) is a connecting rod (16), which is connected to the fixed plate (12).

3. A self-positioning flexible clamp according to claim 1 or 2, characterized in that, The fixed plate (12) is engaged with the gripper (13), and the gripper (13) is L-shaped. The gripper (13) is used to position and hold the object (8).

4. A self-positioning flexible clamp according to claim 1 or 2, characterized in that, One side of the base (3) is a suction cup fastener (5), and the suction cup fastener (5) is connected to the suction cup connecting rod (6) below.

5. A self-positioning flexible clamp according to claim 4, characterized in that, The suction cup connecting rod (6) fixes the suction cup (7), and the suction cup (7) sucks up the object (8).

6. A self-positioning flexible clamp according to claim 1 or 5, characterized in that, The base (3) is long and narrow, and a hollow groove (4) is provided in the middle of the base (3). The hollow groove (4) positions the T-shaped fixing seat (14).

7. A self-positioning flexible clamp according to claim 1 or 5, characterized in that, The elastic element (11) is placed between the T-shaped fixing seat (14) and the side fixing seat (18).

8. A self-positioning flexible clamp according to claim 7, characterized in that, The side fixing seat (18) is located at the guide shaft end (9), and a gasket (10) is provided between the guide shaft end (9) and the side fixing seat (18).

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