Sterile bag fixing device for sampling test

Abstract

The utility model provides a sterile bag fixing device for sampling detection, including support base plate, the support base plate upper surface middle part is divided into two sterile bag placing area through a support frame, the sterile bag placing area upper surface is equipped with the placing groove, be provided with the fixed disc in the placing groove, the fixed disc lower surface is equipped with vibration motor, just the vibration motor embeds the placing groove and sets up, be provided with the limiting piece for the limiting fixed sterile bag on the fixed disc, the strip opening is equipped with in support frame left and right side, be provided with synchronous motor in the strip opening, the output of synchronous motor is connected with first screw rod, the first screw rod is spirally equipped with and lifts the seat, lift the seat left end is provided with with left end sterile bag placing area corresponds and is used for realizing the transfer piece that will detect liquid carries on shifting, the utility model discloses can realize sterile bag fixing stability, realize liquid automatic transfer and tableware stable clamping.

Description

Technical Field

[0001] This utility model relates to the field of food hygiene testing equipment technology, and in particular to a sterile bag fixing device for sampling and testing. Background Technology

[0002] With the development of sampling and testing technologies, various sampling devices have been widely used in food, environmental monitoring, medical diagnosis, and other fields. However, in actual operation, especially in the sampling process involving the use of sterile bags, some problems still need to be solved. For example, when collecting sample solutions from tableware for anion detection, the residual amount of anionic synthetic detergents in tableware treated with chemical disinfection methods should meet the requirement of being undetectable. The standard specifies the sampling method for tableware: immerse the spoon (excluding the handle) and the lower part of the chopsticks (about 5cm from the inlet) in an appropriate amount of distilled water (at a ratio of 100mL of distilled water per 100cm² surface area), shake thoroughly 20 times to prepare the sample solution for subsequent testing. According to the food safety sampling and inspection work specifications, after the sample solution is prepared, it needs to be divided equally into test samples and backup samples for retesting to ensure the standardization and accuracy of the testing work and provide a reliable sample basis for subsequent testing and possible retesting. Because sterile bags have high requirements for operational cleanliness, and it is difficult for samplers to operate two bags stably at the same time, problems such as low sampling efficiency, complex operation, and easy contamination occur.

[0003] A search revealed a sampling device with patent number CN114684489B, authorized on May 9, 2023. This device includes a sampling container and a sealing cap, controls the opening and closing of the sampling channel via a switching component, and incorporates an anti-counterfeiting detection mechanism to ensure the security of the sampling process. While this design improves the controllability and security of sampling to some extent, its structure primarily addresses sampling control for a single container and does not address the liquid transfer and fixation issues between multiple sterile bags. Furthermore, the device relies on manual operation for liquid introduction and lacks positioning and support functions for the sterile bags, failing to meet the needs of simultaneous operation with multiple bags. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a sampling and testing sterile bag fixing device that can achieve the stability of sterile bag fixing, automatic liquid transfer and stable clamping of tableware.

[0005] This utility model is implemented using the following method: a sterile bag fixing device for sampling and testing includes a supporting base plate. The upper surface of the supporting base plate is divided into two sterile bag placement areas by a supporting frame. A placement groove is formed on the upper surface of the sterile bag placement area. A fixing plate is set in the placement groove. A vibration motor is set on the lower surface of the fixing plate and is embedded in the placement groove. A limiting member for limiting and fixing the sterile bag is set on the fixing plate. A strip-shaped opening is formed on both the left and right sides of the supporting frame. A synchronous motor is set in the strip-shaped opening. The output end of the synchronous motor is connected to a first screw. A lifting seat is spirally sleeved on the first screw. A transfer member corresponding to the left sterile bag placement area and used to transfer the test liquid is set on the left end of the lifting seat. A clamping member corresponding to the right sterile bag placement area and used to clamp tableware is set on the right end of the lifting seat.

[0006] Furthermore, the limiting component includes a U-shaped support plate, on which two vertical rods are provided with strip-shaped guide openings. A lifting block is slidably disposed inside the U-shaped support plate. A guide block is provided on the side of the lifting block and embedded in the strip-shaped guide opening. A groove is provided on the upper end of the inner side of the lifting block. A clamping block is disposed in the groove via a torsion spring. A pull block is provided on the lower end of the inner side of the clamping block, and the pull block is perpendicular to the clamping block.

[0007] Furthermore, the support frame is provided with a scale.

[0008] Furthermore, a strip-shaped groove is provided on the inner side of the lifting seat, and a second screw is provided in the strip-shaped groove. A rotating block for driving the second screw to rotate is provided at the right end of the lifting seat.

[0009] Furthermore, the transfer component includes a water pump, a first moving block is spirally sleeved on the left end of the second screw, and a support plate is provided on the first moving block at both ends. The water pump is embedded in the middle of the support plate, and the water pump is connected to a water pumping hose and a water outlet hose.

[0010] Furthermore, the clamping component includes an arc-shaped clamping plate, a second moving block is spirally sleeved on the right end of the second screw, a telescopic cylinder is provided on the inner side of the second moving block, the arc-shaped clamping plate is provided at the end of the telescopic rod of the telescopic cylinder, and an anti-slip layer is provided on the inner side of the arc-shaped clamping plate.

[0011] The beneficial effects of this utility model are as follows: This utility model includes a supporting base plate, a sterile bag placement area, a vibration motor, a transfer component, and a clamping component. The vibration motor ensures uniform mixing of the sample liquid, the transfer component and clamping component realize automated operation, and the limiting component and scale design improve the fixing accuracy. It effectively solves the problems of sterile bag displacement, unstable liquid transfer and complicated operation, and has the advantages of improving detection efficiency and accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the structure of the limiting member. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Please see Figure 1 and Figure 2 As shown, this utility model provides an embodiment: a sterile bag fixing device for sampling and testing, including a supporting base plate 1. The upper surface of the supporting base plate 1 is divided into two sterile bag placement areas 3 by a supporting frame 2. A placement groove 31 is formed on the upper surface of the sterile bag placement area 3. A fixing plate 32 is provided in the placement groove 31. A vibration motor (not shown) is provided on the lower surface of the fixing plate 32, and the vibration motor is embedded in the placement groove 31. The fixing plate 32 is provided with a limiting and fixing device for the sterile bag. The limiting component 4; the support frame 2 has strip-shaped openings 21 on both the left and right sides, and a synchronous motor (not shown) is installed in the strip-shaped opening 21. The output end of the synchronous motor is connected to a first screw 22. A lifting seat 23 is spirally sleeved on the first screw 22. A transfer component 5 is provided at the left end of the lifting seat 23, which corresponds to the left end sterile bag placement area 3 and is used to transfer the test liquid. A clamping component 6 is provided at the right end of the lifting seat 23, which corresponds to the right side sterile bag placement area 3 and is used to clamp the tableware.

[0016] The supporting base plate is the foundation structure that supports the entire device. It can be made of sheet metal and provides stable support for the aseptic bag fixing and operating mechanisms. The aseptic bag placement area is a designated operating area, which can be divided into independent spaces using a frame structure to ensure that the two aseptic bags remain isolated during operation. The vibration motor is the driving element that generates mechanical vibration; a miniature eccentric wheel motor can be used, embedded in the bottom of the fixing plate to promote thorough mixing of the liquid inside the aseptic bag. The limiting component is the constraint mechanism that fixes the aseptic bag; an elastic clamping structure can be used, with adjustable clamping force to position the bag opening. The synchronous motor is the power source that achieves synchronous transmission; a stepper motor combined with a screw mechanism can be used to precisely control the movement trajectory of the lifting seat.

[0017] Specifically, during operation, two sterile bags are placed in the placement slots, and the bag openings are fixed in place by limiting devices. The vibration motor is activated to ensure uniform mixing of the liquid inside the bags. Then, a synchronous motor drives the first screw to rotate, causing the lifting seat to move vertically along the strip-shaped opening. The transfer device at the left end of the lifting seat inserts into the left sterile bag to extract the liquid, while the clamping device at the right end positions the tableware. The transfer device then delivers the liquid to the right sterile bag via a flexible tube, achieving precise sample distribution. The entire process is completed with the support of a fixed device, avoiding shaking and contamination caused by manual operation.

[0018] Compared to existing technologies, patent CN114684489B only enables single-container sampling control, while this solution, through its dual placement area and lifting mechanism design, allows operators to simultaneously complete liquid transfer and tableware clamping. Traditional methods require separate fixing and transfer operations; this device integrates multiple steps into a single process through mechanical linkage, significantly improving operational efficiency. Existing technologies rely on manual shaking for liquid mixing; this solution uses a built-in vibration motor to achieve automated mixing, ensuring sample homogeneity.

[0019] Through the above technical solution, this application achieves stable fixation of sterile bags and precise liquid transfer, effectively preventing liquid spillage caused by bag displacement during operation. The dual-zone independent design avoids the risk of cross-contamination, the mechanical transmission mechanism ensures accurate liquid distribution, and the vibration mixing function improves the reliability of test results. The device simplifies the operation that originally required multiple people to a single person, significantly improving sampling and testing efficiency.

[0020] Please continue reading. Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the limiting member 4 includes a U-shaped support plate 41. Each of the two vertical rods on the U-shaped support plate 41 has a strip-shaped guide opening 42. A lifting block 43 is slidably disposed inside the U-shaped support plate 41. A guide block (not shown) is disposed on the side of the lifting block 43 and embedded in the strip-shaped guide opening 42. A groove 44 is provided on the upper end of the inner side of the lifting block 43. A clamping block 45 is disposed in the groove 44 by a torsion spring. A pull block 46 is disposed on the lower end of the inner side of the clamping block 45, and the pull block 46 is perpendicular to the clamping block 45.

[0021] The U-shaped support plate is a plate-like structure with a U-shaped profile, which can be made of metal or engineering plastic, and is used to provide a sliding track and support base for the lifting block. The strip-shaped guide opening is an opening extending longitudinally along the vertical rod of the U-shaped support plate, which can be formed by milling, and is used to limit the movement trajectory of the lifting block. The lifting block is a block-like component that slides along the inner wall of the U-shaped support plate, which can be implemented using a slider and guide rail structure, and is used to support the clamping mechanism. The guide block is a protruding structure fixed to the side of the lifting block, which can be bolted or integrally formed, and is used to cooperate with the strip-shaped guide opening to achieve limiting. It is fixed by a pin, which limits and fixes the lifting block 43, and the pulling of the pin allows the lifting block to move up and down within the U-shaped support plate. The groove is a recessed area on the upper inner side of the lifting block, which can be formed by milling, and is used to accommodate the installation of the torsion spring and the clamping block. The torsion spring is a spring element with rotational elastic deformation capability, which can be a helical spring structure, and is used to provide clamping force for the clamping block. The clamping block is the component used to contact the edge of the sterile bag. It can be a metal plate covered with rubber or silicone, and its angle can be adjusted adaptively via a torsion spring. The pull block is a lateral extension component located at the lower end of the clamping block. It can be manufactured using injection molding and provides a point of force application during manual operation.

[0022] Specifically, when it is necessary to secure the sterile bag, the operator can pull the lever to rotate the clamping block outward. At this time, the torsion spring deforms and stores elastic potential energy. After placing the edge of the sterile bag opening between the clamping block and the lifting block, the lever is released, and the torsion spring releases its elastic potential energy to drive the clamping block to rotate inward, thereby clamping and securing the edge of the sterile bag. The lifting block can slide up and down along the strip guide opening of the U-shaped support plate and is fixed by a pin. The pin can limit and fix the lifting block 43, and then pulling the pin can facilitate the lifting block to move up and down within the U-shaped support plate. The cooperation between the guide block and the strip guide opening ensures that the lifting block maintains a vertical movement trajectory and avoids deviation. This structure allows the clamping height to be adjusted according to the size of the sterile bag, and the symmetrical arrangement of multiple sets of clamping blocks achieves uniform force distribution.

[0023] Compared to existing technologies, traditional aseptic bag fixing devices mostly use fixed buckles or straps, which cannot adjust the height according to the bag size and lack adaptive clamping function. For example, the sampling device in patent CN114684489B relies solely on the container's own sealing structure and does not include an adjustable clamping mechanism. This solution achieves height adjustment through the sliding cooperation between the lifting block and the guide port. Combined with the clamping block driven by a torsion spring, it can automatically compensate for the clamping force during the fixing of aseptic bags of different sizes, avoiding bag damage due to excessive compression.

[0024] Through the above technical solution, this application achieves rapid clamping and release of the sterile bag opening edge, solving the problem of difficulty in stably fixing multiple sterile bags during manual operation. The adaptive angle adjustment function of the clamping block can adapt to bag edges of different thicknesses, and the sliding adjustment mechanism of the lifting block can match sterile bags of different heights, ensuring that the bag remains upright during sampling and effectively preventing liquid spillage. The vertical setting of the pull block allows operators to complete the clamping action with one hand, significantly improving operational efficiency and reducing the risk of contamination.

[0025] Please continue reading. Figure 1 As shown in one embodiment of the present invention, the support frame 2 is provided with a scale 20.

[0026] The support frame, located in the center of the support base plate, is used to separate the sterile bag placement area. It can be made of metal or plastic and serves to divide the area and support the synchronous motor. The scale markings are indicator marks, which can be formed on the surface of the support frame using laser engraving or printing processes. These markings indicate the height of the lifting seat or the movement distance of the transfer and clamping components.

[0027] Specifically, the scale lines on the support frame surface are evenly distributed vertically. When the synchronous motor drives the lifting seat to move, the operator can determine the real-time height of the transfer or clamping components by observing the scale lines. For example, when it is necessary to insert the water pump hose into a sterile bag to a specific depth, the scale lines provide a visual reference to ensure the consistency of the hose insertion depth. During the clamping of tableware, the scale lines can help determine the horizontal position of the clamping components, avoiding tilting or slippage of the tableware due to visual estimation errors.

[0028] Compared to existing technologies, such as the sampling device in CN114684489B, which lacks positioning marks, operators must rely on experience to judge the liquid transfer or clamping position, making them prone to operational deviations due to visual errors. This application provides a standardized reference for the operation process by setting graduations on the surface of the support frame, reducing human judgment errors and improving the standardization and repeatability of the operation.

[0029] Through the above technical solution, this application solves the problem of insufficient positioning accuracy during the operation of the sterile bag fixing device. The precise positioning of the transfer component and the clamping component is achieved through the scale lines, ensuring consistent sample liquid transfer volume and stable tableware clamping position, thereby reducing the risk of sample contamination caused by operational errors and improving the reliability of test results.

[0030] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, a strip-shaped groove 24 is provided on the inner side of the lifting seat 23, and a second screw (not shown) is provided in the strip-shaped groove 24. A rotating block 25 for driving the second screw to rotate is provided at the right end of the lifting seat 23.

[0031] The groove refers to a slot-shaped structure extending along the length of the lifting seat, which can be formed by machining. It is used to accommodate the second screw and limit its radial displacement. The second screw is a threaded rod-shaped transmission component, which can be made of metal and transmits linear displacement through rotation. The rotating block is a drive component with a rotating handle, which can be made of plastic or metal and drives the second screw to rotate manually or electrically.

[0032] Specifically, when the rotating block is operated, the second screw rotates within the strip-shaped groove, causing the movable component, which is helically sleeved thereon, to translate along the screw axis. This translational motion allows the positions of the transfer component and the clamping component to be precisely adjusted according to the actual needs of the sterile bag placement area. For example, when transferring test liquids, the rotation of the second screw controls the horizontal movement range of the water pump, ensuring that the water suction hose is accurately aligned with the liquid inside the sterile bag; when clamping tableware, the rotation of the second screw adjusts the opening and closing range of the clamping plate to accommodate the fixing needs of tableware of different sizes.

[0033] Compared to existing technologies, current sampling devices generally lack the function of coordinated adjustment of the transfer and clamping components. For example, the sampling container in patent CN114684489B can only achieve single-channel on / off control. In contrast, this solution achieves synchronous position adjustment of the transfer and clamping components through the cooperation of the second screw and the rotating block, avoiding operational errors caused by repeated manual adjustments.

[0034] Through the above technical solution, this application effectively solves the technical problem of difficulty in coordinating the transfer and clamping operations during sterile bag sampling. The threaded transmission mechanism of the second screw ensures the accuracy of the positioning of the moving parts, the driving method of the rotating block simplifies the operation steps, and the structural design of the strip groove enhances the stability of the transmission system, thereby improving sampling efficiency while reducing the risk of liquid spillage or instrument slippage.

[0035] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the transfer component 5 includes a water pump 51, a first moving block (not shown) is spirally sleeved on the left end of the second screw, a support plate 52 is provided on the first moving block at both ends, the water pump 51 is embedded in the middle of the support plate 52, and the water pump 51 is connected to a water pumping hose 53 and a water outlet hose 54.

[0036] The second screw refers to a rod-shaped structure that drives the first moving block to move along the screw axis through threaded transmission. Specifically, it can be implemented using a metal rod with bidirectional threads. By rotating the screw, the first moving blocks on both sides move closer or further apart synchronously.

[0037] The first moving block refers to a sliding component that is threadedly engaged with the second screw. Specifically, it can be implemented by a metal block with an internally embedded threaded sleeve. The screw rotation drives the moving block to move along the strip groove, thereby adjusting the position of the support plate.

[0038] Among them, the water pump refers to the power device used to extract liquid, which can be implemented by a miniature centrifugal pump. The liquid is transferred from the sterile bag to the external container by connecting a hose.

[0039] Among them, the pumping hose and the outlet hose refer to flexible liquid delivery pipes, which can be made of medical-grade silicone tubing. Their inner diameter can be adapted to different flow requirements. For example, a hose with an inner diameter of 5mm can meet the requirements of conventional sampling flow rates.

[0040] Specifically, when it is necessary to transfer the test liquid from one sterile bag to another container, the rotating block drives the second screw to rotate, causing the first moving blocks on both sides to move the support plate to the target position. After the water pump is started, the water suction hose extends into the sterile bag to draw out the liquid, which is then discharged to the external container through the water outlet hose. The horizontal movement range of the support plate can be adjusted by the screw length; for example, a screw length of 300mm can cover the liquid transfer needs between two sterile bag placement areas. The water pump is embedded in the middle of the support plate to prevent positional displacement due to vibration, while the flexible connection of the hose allows for slight shaking of the sterile bag during the transfer process.

[0041] Compared to existing technologies, current devices such as CN114684489B rely on manual operation for liquid transfer and cannot achieve automatic positioning and liquid distribution among multiple bags. This solution uses a screw-driven support plate movement, combined with a water pump and hose structure, to precisely control the liquid transfer path and reduce the risk of contamination from manual intervention. Furthermore, the bidirectional screw design ensures synchronous movement of the moving blocks on both sides, guaranteeing the support plate remains horizontal and stable during movement and preventing liquid spillage.

[0042] Through the above technical solution, this application realizes the automated directional transfer of test liquids, solving the problems of low efficiency and easy contamination of manual operation. By adjusting the position of the support plate with a screw, it can adapt to the liquid extraction needs of sterile bags of different sizes. At the same time, the cooperation between the water pump and the hose ensures the sterility and controllability of the liquid transfer process, meeting the standardized requirements for sample liquid dispensing in food safety testing.

[0043] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the clamping member 6 includes an arc-shaped clamping plate 61, a second moving block (not shown) is spirally sleeved on the right end of the second screw, a telescopic cylinder 62 is provided on the inner side of the second moving block, the arc-shaped clamping plate 61 is provided at the end of the telescopic rod of the telescopic cylinder 62, and an anti-slip layer 63 is provided on the inner side of the arc-shaped clamping plate 61.

[0044] The second movable block refers to a movable component that is screwed onto the second screw. Specifically, it can be made of aluminum alloy and machined into a slider structure with internal threads. Horizontal displacement adjustment is achieved by rotating the second screw. The telescopic cylinder is a drive element capable of outputting linear motion. Specifically, it can be a pneumatic piston cylinder, controlling the extension length of the telescopic rod through air pressure. The arc-shaped clamping plate is a clamping component with an arc-shaped contact surface. Specifically, it can be injection molded from polyurethane material, and its radius of curvature can be set to match the outer diameter of common tableware. The anti-slip layer is a friction-enhancing layer attached to the inner surface of the clamping plate. Specifically, it can be made of silicone particles fixed to the surface of the clamping plate through a hot-pressing process, forming a textured structure.

[0045] Specifically, when tableware needs to be secured, the second screw drives the second moving block to move horizontally to the target position via rotation. Then, the telescopic cylinder pushes the arc-shaped clamping plate to extend towards the tableware until the anti-slip layer contacts the tableware surface. During this process, the arc design of the clamping plate increases the contact area with the tableware, and the textured structure of the anti-slip layer effectively increases friction. The lateral position of the clamping component can be controlled by adjusting the rotation angle of the second screw, while the stroke adjustment of the telescopic cylinder can accommodate the securing needs of tableware of different sizes, thereby achieving stable clamping of the tableware within the sterile bag.

[0046] Compared to existing technologies, the patent with publication number CN114684489B only uses a single container for sampling and does not involve a tableware clamping function. This solution, through an adjustable clamping structure, solves the problem of liquid transfer difficulties caused by unstable tableware fixation in existing technologies, and avoids the risk of sample contamination caused by tableware slipping during manual operation.

[0047] Through the above technical solution, this application achieves precise positioning and reliable fixation of tableware in sterile bags, ensuring that the relative position of tableware and sterile bags remains stable during liquid transfer, thereby avoiding sample spillage or cross-contamination caused by tableware shaking. At the same time, it can adapt to the clamping needs of tableware of different shapes and sizes, significantly improving the standardization and success rate of sampling operations.

[0048] The synchronous motor, water pump, and telescopic cylinder in this invention are all existing technologies, which are already clearly understood by those skilled in the art, and will not be described in detail here.

[0049] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A sterile bag fixing device for sampling and testing, characterized in that: The device includes a supporting base plate. The upper surface of the supporting base plate is divided into two sterile bag placement areas by a supporting frame. Each sterile bag placement area has a placement groove on its upper surface, and a fixing plate is installed within the groove. A vibration motor is installed on the lower surface of the fixing plate and is embedded within the groove. The fixing plate has a limiting component for securing the sterile bags. The supporting frame has strip-shaped openings on both its left and right sides, and a synchronous motor is installed within each opening. The output end of the synchronous motor is connected to a first screw, and a lifting seat is spirally fitted onto the first screw. The left end of the lifting seat has a transfer component corresponding to the left sterile bag placement area for transferring the test liquid, and the right end of the lifting seat has a clamping component corresponding to the right sterile bag placement area for holding tableware.

2. The sterile bag fixing device for sampling and testing according to claim 1, characterized in that: The limiting component includes a U-shaped support plate. Each of the two vertical rods on the U-shaped support plate has a strip-shaped guide opening. A lifting block is slidably disposed inside the U-shaped support plate. A guide block is disposed on the side of the lifting block and embedded in the strip-shaped guide opening. A groove is disposed on the upper end of the inner side of the lifting block. A clamping block is disposed in the groove via a torsion spring. A pull block is disposed on the lower end of the inner side of the clamping block, and the pull block is perpendicular to the clamping block.

3. The sterile bag fixing device for sampling and testing according to claim 1, characterized in that: The support frame is provided with graduations.

4. The sterile bag fixing device for sampling and testing according to claim 1, characterized in that: The inner side of the lifting seat is provided with a strip-shaped groove, and a second screw is provided in the strip-shaped groove. A rotating block for driving the second screw to rotate is provided at the right end of the lifting seat.

5. The sterile bag fixing device for sampling and testing according to claim 4, characterized in that: The transfer component includes a water pump. A first moving block is spirally sleeved on the left end of the second screw. Support plates are provided on the first moving blocks at both ends. The water pump is embedded in the middle of the support plate. The water pump is connected to a water pumping hose and a water outlet hose.

6. The sterile bag fixing device for sampling and testing according to claim 4, characterized in that: The clamping component includes an arc-shaped clamping plate. A second moving block is spirally sleeved on the right end of the second screw. A telescopic cylinder is provided on the inner side of the second moving block. The arc-shaped clamping plate is provided at the end of the telescopic rod of the telescopic cylinder. An anti-slip layer is provided on the inner side of the arc-shaped clamping plate.

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