Material belt folding and pressing type pneumatic press

Abstract

The utility model relates to the technical field of material belt folding and pressing pneumatic press machines, and discloses a material belt folding and pressing type pneumatic press machine which comprises a pneumatic pressure assembly, a ceramic heating piece, a gasket piece, a base and a pressing head assembly. The timer is used for controlling the pneumatic cylinder, and the pneumatic cylinder is used for driving the pressure head assembly to press down or rise; the ceramic heating piece is installed on the pressing head assembly, the heating module is used for controlling the ceramic heating piece to be powered on to emit heat, the ceramic heating piece is used for conducting heat to the pressing head assembly, the gasket piece is located below the pressing head assembly, and the pressing head assembly and the gasket piece are used for folding and pressing a material belt. Compared with a manual press machine, the press machine has the advantages that the operation stability is improved, the pressing time of each product is standard and uniform, the operation of staff is more convenient, more time and labor are saved, the aching pain of fingers caused by long-time bending of the staff can be solved, and meanwhile, the risk of scalding caused by manual operation is effectively avoided.

Description

Technical Field

[0001] This utility model patent relates to the technical field of a feed belt folding pneumatic press, specifically, to a feed belt folding pneumatic press. Background Technology

[0002] Tempered glass screen protectors are a type of protective film primarily designed to enhance the protection of electronic device screens. By completely covering the original screen surface, the tempered glass film creates compressive stress on the glass surface. When the glass is subjected to external forces, this surface stress is first offset, thereby improving its load-bearing capacity and enhancing its resistance to wind pressure, temperature changes, and impacts. It also achieves excellent properties such as high hardness, low toughness, good wear resistance, and scratch resistance.

[0003] Tempered glass screen protectors include a tempered glass film, a positioning film, and a tape. One side of the tempered glass film has an adhesive layer that adheres to the phone screen. The tape covers the adhesive layer. Both the tape and the positioning film protrude from the edge of the tempered glass film, facilitating the positioning of the tempered glass film and the tearing of the tape. When applying the film, simply tear off the tape, and the tempered glass film will adhere to the phone screen through the adhesive layer.

[0004] During the production of tempered glass film, the strip needs to be bent inwards to prevent the long protruding part of the strip from easily detaching from the adhesive layer due to external forces. Currently, the bending and pressing of the strip is assisted by a hot pressing device. For example, the prior patent with authorization announcement number CN221497078U discloses a hot pressing device based on tempered glass film encapsulation. The hot pressing device includes a base, a hot pressing component and a pad on the base. The pad has a placement surface for placing the strip to be hot pressed. The hot pressing component is used to press the strip on the placement surface against the hot pressing. On one side of the pad, a receiving groove is opened along the length direction of the pad. The receiving groove is used for the insertion of a positioning film, which is separated from the strip.

[0005] In existing technologies, hot pressing is achieved by having employees manipulate the movement of hot pressing components, which can easily lead to burns. In addition, it is laborious to operate, and the pressing time is unstable due to human control, resulting in poor pressing quality of the material strip. Utility Model Content

[0006] The purpose of this invention is to provide a pneumatic press for conveying and pressing material strips, which aims to solve the problem of burns that easily occur during hot pressing operations in the existing technology.

[0007] This invention is implemented as follows: a pneumatic press for folding and pressing material strips includes a pneumatic pressure assembly, a ceramic heating element, a gasket, a base, and a press head assembly. The pneumatic pressure assembly includes a timer, a heating module, a pneumatic cylinder, and a foot pedal. The foot pedal is used to input commands, and the timer is used to control the pneumatic cylinder. The pneumatic cylinder and the press head assembly are assembled together, and the pneumatic cylinder is used to drive the press head assembly to press down or rise. The ceramic heating element is installed on the press head assembly, and the heating module is used to control the ceramic heating element to be energized and generate heat. The ceramic heating element is used to conduct heat to the press head assembly. The gasket is installed on the base and is arranged below the press head assembly. The press head assembly and the gasket are used to fold and press the material strip.

[0008] Furthermore, the pneumatic pressure assembly includes a pneumatic housing and a control board. The control board, the timer, and the heating module are respectively installed in the pneumatic housing. The pneumatic cylinder, the timer, and the heating module are electrically connected to the control board. The control board is arranged in communication with the foot pedal and is used to receive input commands from the foot pedal.

[0009] Furthermore, the feed belt folding pneumatic press includes a work frame, which includes a frame body and a platform. The platform is used to mount the base. The lower part of the frame body is connected to the platform, and the upper part of the frame body extends upward. The pneumatic box is mounted on the frame body, and the pneumatic pressure assembly and the pneumatic box are arranged at intervals away from the operator.

[0010] Furthermore, the pneumatic pressure assembly includes a pneumatic mounting base and a pneumatic rod. The pneumatic rod is arranged longitudinally, and its lower part is fixedly arranged with the frame. The pneumatic rod passes through the pneumatic mounting base, and the pneumatic mounting base and the pneumatic rod are locked or unlocked. The pneumatic cylinder is stacked vertically with the pneumatic mounting base. The pneumatic mounting base supports the pneumatic cylinder. The pressure head assembly is located below the pneumatic mounting base, and the pneumatic cylinder passes through the pneumatic mounting base and is docked with the pressure head assembly.

[0011] Furthermore, the base includes a bakelite board, which is movably arranged and has a padding groove that is recessed downwards, and the gasket is installed in the padding groove; the bakelite board also has a fixed post groove for the bottom of the gasket rod to be embedded.

[0012] Furthermore, the bakelite board has a filling groove for positioning the material strip, and the depth of the filling groove is greater than the depth of the padding groove.

[0013] Furthermore, the pressure head assembly includes a locking rod, a floating joint, and a pressure head body. The locking rod is arranged longitudinally, and its two ends are respectively connected to the pneumatic cylinder and the floating joint. The locking rod, the floating joint, and the pressure head body are assembled sequentially from top to bottom. The ceramic heating element is installed inside the pressure head body and is used to output heat to the pressure head body. The pressure head body and the gasket are arranged vertically in correspondence and are used to fold and press the material strip.

[0014] Furthermore, the locking rod has a cylinder joint and a head joint at its two ends, respectively. The head joint is used to mate with the floating joint, and the cylinder joint is arranged in the direction toward the pneumatic cylinder. The locking rod has a rod groove, which is recessed inward and extends through the cylinder joint. The pneumatic cylinder includes a cylinder column, which is embedded in the cylinder joint. The cylinder column has two retaining blocks, and the two retaining blocks are respectively embedded in the rod groove.

[0015] Furthermore, the pressure head body includes an upper pressure head and a lower pressure head, which are arranged vertically and integrally. The upper pressure head is rectangular, and the lower pressure head is arranged in a trapezoidal shape with a larger upper part and a smaller lower part along the direction away from the upper pressure head. The lower part of the lower pressure head is provided with a pressure head groove, which extends laterally and is used to install the ceramic heating element. The lower pressure head has a lower pressure surface, which, together with the gasket, is used to fold and press the material strip. The pressure head groove is arranged close to the lower pressure surface.

[0016] Furthermore, the gasket includes a padding surface, a receiving groove, a first guide surface, and a second guide surface. The padding surface is located below the pressure head assembly and is used to place the material strip. The receiving groove is used for inserting the positioning film. The first guide surface is located below the receiving groove and is arranged to gradually slope downwards outwards in a direction away from the receiving groove. The second guide surface is located above the receiving groove and is aligned with the padding surface. The second guide surface is arranged to gradually slope downwards in a direction away from the padding surface.

[0017] Compared with existing technologies, the pneumatic press for folding and pressing of the product strip provided by this utility model uses a pressure head assembly and a base to press the product strip. The operator inputs a command via a foot pedal to activate the heating module, which controls the ceramic heating element to be energized and heated, thus achieving the folding and pressing of the strip. Compared with manual presses, it improves the stability of operation, standardizes the pressing time for each product, and is more convenient for employees to operate, saving time and effort. It can improve the instability and substandard results of manual bending by employees, and also solve the problem of finger pain caused by prolonged bending. At the same time, it effectively avoids the risk of burns caused by manual operation. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the material conveying belt folding pneumatic press provided by this utility model;

[0019] Figure 2 This is a top view of the base of the feed belt folding pneumatic press provided by this utility model;

[0020] Figure 3 This is a three-dimensional schematic diagram of the locking rod of the feeding belt folding pneumatic press provided by this utility model;

[0021] Figure 4 This is a three-dimensional schematic diagram of the pressure head assembly of the feed belt folding pneumatic press provided by this utility model;

[0022] Figure 5 This is a cross-sectional schematic diagram of the gasket component of the feed belt folding pneumatic press provided by this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0025] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] Reference Figure 1-5 The image shown is a preferred embodiment of the present invention.

[0027] The pneumatic press for folding and pressing material strips includes a pneumatic pressure assembly 1, a ceramic heating element 5, a gasket 4, a base 3, and a press head assembly 2. The pneumatic pressure assembly 1 includes a timer, a heating module, a pneumatic cylinder 11, and a foot pedal. The foot pedal is used to input commands, and the timer is used to control the pneumatic cylinder 11. The pneumatic cylinder 11 is assembled with the press head assembly 2, and the pneumatic cylinder 11 is used to drive the press head assembly 2 to press down or rise. The ceramic heating element 5 is installed on the press head assembly 2, and the heating module is used to control the ceramic heating element 5 to be energized and generate heat. The ceramic heating element 5 is used to conduct heat to the press head assembly 2. The gasket 4 is installed on the base 3 and is arranged below the press head assembly 2. The press head assembly 2 and the gasket 4 are used to fold and press the material strip.

[0028] The aforementioned pneumatic press for bending and pressing material strips uses the pressure head assembly 2 and the base 3 to press the product strip. The operator inputs a command via a foot pedal to activate the heating module, which in turn powers the ceramic heating element 5 to heat the strip, thus bending and pressing it. Compared to a manual press, this improves operational stability, ensures a consistent pressing time for each product, and makes it easier for employees to operate, saving time and effort. It also improves the instability and substandard results of manual bending, and eliminates the finger pain caused by prolonged bending. Furthermore, it effectively avoids the risk of burns from manual operation.

[0029] By stepping on the foot pedal, the pneumatic press head smoothly presses down on the material strip, ensuring that the material strip that needs to be bent is subjected to stable and even force, pressing out a parallel line.

[0030] The foot pedal is connected to the pneumatic pressure assembly via an electrical wire, and the pneumatic pressure assembly is controlled by the foot pedal.

[0031] The heating module and the ceramic heating element 5 are connected by wires, and the heating module enables the ceramic heating element 5 to be powered on or off.

[0032] The pneumatic pressure assembly 1 includes a pneumatic box and a control board. The control board, timer, and heating module are respectively installed in the pneumatic box. The pneumatic cylinder 11, timer, and heating module are electrically connected to the control board. The control board is connected to the foot pedal and is used to receive input commands from the foot pedal.

[0033] In this way, the pneumatic box enables the setting of the control board, timer, and heating module, and also protects the control board, timer, and heating module.

[0034] When the pneumatic cylinder 11 is running, the air inside the pneumatic cylinder 11 expands and converts thermal energy into mechanical energy; the gas is compressed by the piston in the compressor cylinder to increase the pressure, and presses the pressure head assembly 2 to the material belt position.

[0035] The gasket 4 is made of SKD11 steel, which has excellent properties such as high hardness, high wear resistance, uniform eutectic carbides, good toughness, and resistance to cracking. This makes it easy for the gasket 4 to deform even when the pressure head assembly 2 presses down on it multiple times.

[0036] The material strip folding pneumatic press includes a work frame, which includes a frame body and a platform. The platform is used to mount the base 3. The lower part of the frame body is connected to the platform, and the upper part of the frame body extends upward. The pneumatic box is mounted on the frame body, and the pneumatic pressure assembly 1 and the pneumatic box are arranged at intervals away from the operator. The work frame enables the installation of the pneumatic box and facilitates the wiring layout between the pneumatic pressure assembly 1 and the pneumatic box.

[0037] The pneumatic pressure assembly 1 includes a pneumatic mounting base and a pneumatic rod. The pneumatic rod is arranged longitudinally, and its lower part is fixed to the frame. The pneumatic rod passes through the pneumatic mounting base, and the pneumatic mounting base and the pneumatic rod are locked or unlocked. The pneumatic cylinder 11 is stacked on top of the pneumatic mounting base. The pneumatic mounting base is used to support the pneumatic cylinder 11. The pressure head assembly 2 is located below the pneumatic mounting base, and the pneumatic cylinder 11 passes through the pneumatic mounting base and is docked with the pressure head assembly 2.

[0038] With the cooperation of the pneumatic mounting base and the pneumatic rod, the pneumatic cylinder 11 is assembled and fixed, thereby allowing the installation height of the pneumatic cylinder 11 to be adjusted.

[0039] The base 3 includes a bakelite board, which is arranged in a movable manner to allow for free adjustment of the length of the strip product, so as to meet the folding and pressing operations of strip products of different specifications.

[0040] The bakelite board has a padding groove 31, which is recessed downwards, and the pad 4 is installed in the padding groove 31. This improves the assembly effect between the pad 4 and the bakelite board. At the same time, the bakelite board plays a role in positioning and reinforcing the pad 4, ensuring the stability of the pad 4.

[0041] The bakelite board has a fixed groove 33, which is embedded at the bottom of the gas-inserting rod. Under the action of the fixed groove 33, the cooperation effect between the bakelite board and the gas-inserting rod is improved, so that the gas-inserting rod can position and reinforce the bakelite board, thereby improving the stability of the bakelite board.

[0042] The depth of the pad groove 31 is 2.75mm, which enables the assembly of the pad part 4.

[0043] The top of the bakelite board is equipped with two hexagonal screws, which are arranged in a left-right correspondence. The hexagonal screws are used to position the bakelite board on the stand.

[0044] The bakelite board has a filling groove 32, which is used to position the material strip. The depth of the filling groove 32 is greater than the depth of the padding groove 31. Under the action of the filling groove 32, it is easy to guide and position the tempered film, and it is easy to move the bending part of the material strip to the padding surface 41, while the positioning film can be inserted into the receiving groove 42 more smoothly.

[0045] The pressure head assembly 2 includes a locking rod 21, a floating joint 22, and a pressure head body 23. The locking rod 21 is arranged longitudinally, and its two ends are respectively connected to the pneumatic cylinder 11 and the floating joint 22. The locking rod 21, the floating joint 22, and the pressure head body 23 are assembled sequentially from top to bottom. The ceramic heating element 5 is installed inside the pressure head body 23 and is used to output heat to the pressure head body 23. The pressure head body 23 and the gasket 4 are arranged vertically in correspondence and are used to fold and press the material strip.

[0046] In this way, the downward pressure is applied through the cooperation of the locking rod 21, the floating joint 22 and the pressure head body 23, thereby realizing the bending and pressing operation.

[0047] The locking rod 21 has a cylinder connection and a head connection at its two ends, respectively. The head connection is used to mate with the floating joint 22, and the cylinder connection is arranged in the direction toward the pneumatic cylinder 11. The locking rod 21 has a rod connection groove 211, which is recessed inward and extends to the cylinder connection. The pneumatic cylinder 11 includes a cylinder column, and the cylinder connection is used to fix the cylinder column. The cylinder column has two column fixing blocks, and the two column fixing blocks are respectively fitted with the rod connection groove 211.

[0048] Under the action of the locking rod 21, the floating joint 22 is set, and the pressure head body 23 is more stable and evenly presses the product, so that the product will not be deformed due to uneven force on the left and right sides; at the same time, under the action of the rod groove 211, the assembly stability of the locking rod 21 and the pneumatic cylinder 11 is improved.

[0049] Furthermore, the cylinder head and cylinder rod can be assembled and disassembled using a threaded connection.

[0050] The pressure head body 23 includes an upper pressure head and a lower pressure head. The upper pressure head and the lower pressure head are arranged in an integral manner, with the upper pressure head in a rectangular shape and the lower pressure head in a trapezoidal shape with a larger upper part and a smaller lower part, along the direction away from the upper pressure head. The lower part of the lower pressure head is provided with a pressure head groove, which extends laterally. The pressure head groove is used to install the ceramic heating element 5. The lower pressure head has a lower pressure surface, which, together with the gasket 4, is used to fold and press the material strip. The pressure head groove is arranged close to the lower pressure surface.

[0051] The pressure head groove is used to insert the ceramic heating element 5, which facilitates the setting and replacement of the ceramic heating element 5. The lower pressure head is arranged in a trapezoidal shape, which can evenly and stably press the product.

[0052] The pressure head is made of A-304-01 material, which can be used multiple times and is not easily deformed. When used with a ceramic heating element, it can effectively press the product to the standard state in 53 seconds.

[0053] The ceramic heating element 5 can reach a maximum heating temperature of 80°C, which allows the heat from the lower pressure head to reach the appropriate temperature for the deformation of the PET material.

[0054] The gasket 4 includes a padding surface 41, a receiving groove 42, a first guide surface 43, and a second guide surface 44. The padding surface 41 is located below the pressure head assembly 2 and is used to place the material strip. The receiving groove 42 is used for inserting the positioning film. The first guide surface 43 is located below the receiving groove 42 and is arranged to gradually slope downwards outwards in a direction away from the receiving groove 42. The second guide surface 44 is located above the receiving groove 42 and is aligned with the padding surface 41. The second guide surface 44 is arranged to gradually slope downwards in a direction away from the padding surface 41.

[0055] As the tempered glass film moves horizontally, moving the bent part of the material strip to the padding surface 41, the overlapping part of the positioning film and the material strip comes into contact with the first guide surface 43. Guided by the first guide surface 43, which gradually slopes downward from the inside out, the positioning film can be inserted into the receiving groove 42 more smoothly, reducing the probability of the positioning film being blocked from the receiving groove 42 and ensuring the accuracy of the separation between the positioning film and the material strip when inserted into the receiving groove 42.

[0056] As the tempered glass film is moved horizontally, the bending part of the strip is moved to the padding surface 41. The strip first contacts the second guide surface 44 and is guided by the second guide surface 44, so that the bending part of the strip can move to the padding surface 41 more accurately and smoothly, thereby improving the feeding efficiency of the tempered glass film.

[0057] The specific bending and pressing operation is as follows: The tempered glass film is placed on the base 3, and the tempered glass film is positioned by the shim 4 to separate the mold and the strip. At this time, the bending point of the strip is located on the pad surface 41. Then, the pressure head assembly 2 is controlled to move downward until the pressure surface and the pad surface 41 clamp the strip for hot pressing. When the expected hot pressing time is reached, the pressure head assembly 2 is controlled to operate and reset to disengage from the strip, thereby achieving hot pressing of the bending point of the strip to prevent the strip from springing back and arching after bending, and to ensure the flatness of the strip after bending.

[0058] Meanwhile, under the action of the receiving groove 42, the material strip is separated from the positioning film during the hot pressing and folding operation, which effectively prevents the pressing head from damaging the overlapping part of the positioning film and the material strip during the hot pressing process.

[0059] Specific separation method: Since the material strip and the positioning film are located on the upper and lower sides of the tempered film respectively, the material strip located on the upper side is moved to the padding surface 41 of the pad block, and the positioning film located on the lower side is inserted into the receiving groove 42, thereby achieving the purpose of separating the material strip and the positioning film.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A press for folding and pressing a material strip, characterized in that The device includes a pneumatic pressure assembly, a ceramic heating element, a gasket, a base, and a pressure head assembly. The pneumatic pressure assembly includes a timer, a heating module, a pneumatic cylinder, and a foot pedal. The foot pedal is used to input commands, and the timer is used to control the pneumatic cylinder. The pneumatic cylinder is assembled with the pressure head assembly and is used to drive the pressure head assembly to press down or rise. The ceramic heating element is installed on the pressure head assembly, and the heating module is used to control the ceramic heating element to generate heat. The ceramic heating element is used to conduct heat to the pressure head assembly. The gasket is installed on the base and is arranged below the pressure head assembly. The pressure head assembly and the gasket are used to fold and press the material strip.

2. The press-through air transfer press according to claim 1, wherein The pneumatic pressure assembly includes a pneumatic housing and a control board. The control board, the timer, and the heating module are respectively installed in the pneumatic housing. The pneumatic cylinder, the timer, and the heating module are electrically connected to the control board. The control board is arranged in communication with the foot pedal and is used to receive input commands from the foot pedal.

3. The press-through air transfer press according to claim 2, wherein The feeding belt folding pneumatic press includes a work frame, which includes a frame body and a platform. The platform is used to mount the base. The lower part of the frame body is connected to the platform, and the upper part of the frame body extends upward. The pneumatic box is mounted on the frame body, and the pneumatic pressure assembly and the pneumatic box are arranged at intervals away from the operator.

4. The press-through air transfer press according to claim 3, wherein The pneumatic pressure assembly includes a pneumatic mounting base and a pneumatic rod. The pneumatic rod is arranged longitudinally, and its lower part is fixedly arranged with the frame. The pneumatic rod passes through the pneumatic mounting base, and the pneumatic mounting base and the pneumatic rod are locked or unlocked. The pneumatic cylinder is stacked vertically with the pneumatic mounting base. The pneumatic mounting base supports the pneumatic cylinder. The pressure head assembly is located below the pneumatic mounting base, and the pneumatic cylinder passes through the pneumatic mounting base and is mated with the pressure head assembly.

5. The press-through transfer pneumatic press according to claim 4, wherein The base includes a bakelite board, which is movably arranged and has a padding groove. The padding groove is recessed downwards, and the padding piece is installed in the padding groove. The bakelite board has a fixed groove for the bottom of the gas-operated rod to be embedded.

6. The press-through air transfer press according to claim 5, wherein The bakelite board has a filling groove for positioning the material strip, and the depth of the filling groove is greater than the depth of the padding groove.

7. The press-through air cylinder press according to any one of claims 1 to 6, wherein The pressure head assembly includes a locking rod, a floating joint, and a pressure head body. The locking rod is arranged longitudinally, and its two ends are respectively connected to the pneumatic cylinder and the floating joint. The locking rod, the floating joint, and the pressure head body are assembled sequentially from top to bottom. The ceramic heating element is installed inside the pressure head body and is used to output heat to the pressure head body. The pressure head body and the gasket are arranged vertically in correspondence and are used to fold and press the material strip.

8. The press-through air transfer press according to claim 7, wherein The locking rod has a cylinder joint and a head joint at its two ends, respectively. The head joint is used to mate with the floating joint. The cylinder joint is arranged in the direction toward the pneumatic cylinder. The locking rod has a rod groove that is recessed inward and extends through the cylinder joint. The pneumatic cylinder includes a cylinder column. The cylinder joint is embedded in the cylinder column. The cylinder column has two column fixing blocks, and the two column fixing blocks are respectively embedded in the rod joint groove.

9. The press-through air transfer press according to claim 7, wherein The pressure head body includes an upper pressure head and a lower pressure head, which are arranged vertically and integrally. The upper pressure head is rectangular, and the lower pressure head is arranged in a trapezoidal shape with a larger upper part and a smaller lower part along the direction away from the upper pressure head. The lower part of the lower pressure head is provided with a pressure head groove, which extends laterally and is used to install the ceramic heating element. The lower pressure head has a lower pressure surface, which, together with the gasket, is used to fold and press the material strip. The pressure head groove is arranged close to the lower pressure surface.

10. The tuck-and-pressure pneumatic press for a strip of material according to any one of claims 1 to 6, characterized in that, The gasket includes a padding surface, a receiving groove, a first guide surface, and a second guide surface. The padding surface is located below the pressure head assembly and is used to place the material strip. The receiving groove is used for inserting the positioning film. The first guide surface is located below the receiving groove and is arranged to gradually slope downwards outwards in a direction away from the receiving groove. The second guide surface is located above the receiving groove and is aligned with the padding surface. The second guide surface is arranged to gradually slope downwards in a direction away from the padding surface.

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