A lightweight foam bonded nonwoven fabric

Abstract

The utility model belongs to composite material processing equipment technical field especially relates to a kind of light foam is covered with non-woven fabric's bonding equipment, including bonding composite mechanism and cooling mechanism;The bonding composite mechanism includes a pair of heating roller and a pair of extruding roller being set in mounting frame, the pair of heating roller is set in the feeding side of the pair of extruding roller, and spacing adjustment structure is equipped between the pair of extruding roller;The cooling mechanism is set in the discharging side of the bonding composite mechanism, including at least a pair of rotationally arranged wind cover and driving part, and the driving part is used to drive wind cover to reciprocating swing and blow out.The secondary activation of glue layer by heating roller, the extrusion demand of different thickness materials is adapted using spacing adjustment structure, and swing type wind cover is used to realize dynamic uniform sweep wind cooling, effectively solve the local thermal stress concentration and material warping deformation problem caused by traditional static cooling, improve the flatness and bonding quality of composite board.

Description

Technical Field

[0001] This utility model belongs to the technical field of composite material processing equipment, and in particular relates to an adhesive device for bonding lightweight foam covered with non-woven fabric. Background Technology

[0002] In the field of composite new material processing, lightweight foam-coated nonwoven fabric composites have been widely used in building insulation layers, packaging liners, medical protective equipment, automotive interiors and other scenarios because they combine the cushioning, shock absorption and heat insulation properties of foam with the breathability and wear resistance of nonwoven fabrics. The core process of this type of composite material is to uniformly coat the surface of lightweight foam or nonwoven fabric with hot melt adhesive, and then use bonding equipment to achieve composite molding of the two. The bonding strength and flatness of the bonding directly determine the performance and service life of the finished product.

[0003] Existing lightweight foam-coated nonwoven fabric bonding equipment has two main drawbacks. First, the bonding and lamination stage lacks a targeted and uniform extrusion mechanism, resulting in gaps and poor adhesion between the foam and the nonwoven fabric. Second, the bonded nonwoven fabric and lightweight foam are not fully set, making them prone to deformation during material collection. This leads to poor bonding of the composite material and ultimately causes problems such as nonwoven fabric detachment, wrinkles, and displacement during transportation and use. Utility Model Content

[0004] In view of the technical problems existing in the background art, the present invention provides a bonding device for lightweight foam covered with non-woven fabric.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A lightweight foam-coated nonwoven fabric bonding device includes a bonding and bonding mechanism and a cooling mechanism arranged sequentially along the material conveying direction; The bonding and laminating mechanism includes a housing, with a mounting frame fixedly installed at the top of the housing. The mounting frame contains a pair of heating rollers and a pair of extrusion rollers. The pair of heating rollers are located on the feeding side of the pair of extrusion rollers, and a spacing adjustment component is provided between the pair of extrusion rollers for extruding and laminating the preheated material. The cooling mechanism includes at least one pair of rotatably mounted fan shrouds, with a drive component connected to the outer end of each shroud. The drive component is used to drive the fan shrouds to reciprocate and oscillate to expel air.

[0006] Optionally, the cooling mechanism includes four pairs of movable seats distributed on the upper and lower sides of the material conveying path. Two pairs of movable seats are fixedly installed on the inner top of the mounting frame, and the other two pairs of movable seats are fixedly installed on the inner bottom of the box. The fan shroud is rotatably connected between each pair of movable seats to simultaneously oscillate and cool the upper and lower surfaces of the material.

[0007] Optionally, a centrifugal fan is fixedly connected to the top of the mounting bracket. A three-way pipe is fitted at the output end of the centrifugal fan. The two branch ports of the three-way pipe are connected to the input ends of a pair of fan shrouds on their corresponding sides through pipes. A filter screen is installed at the input end of the centrifugal fan. The driving component is a drive motor, which is fixedly installed on one side of the movable base, and its output shaft is connected to the fan shroud for transmission.

[0008] Optionally, the spacing adjustment assembly includes a pair of slide rails fixedly connected to both sides inside the mounting frame, a connecting frame slidably connected between the pair of slide rails, pneumatic telescopic rods installed on both sides of the top of the mounting frame, the output end of the pneumatic telescopic rods being fixedly connected to the top of the connecting frame, the bottom end of the connecting frame being rotatably connected to the first extrusion roller of a pair of extrusion rollers, and the second extrusion roller being rotatably connected to the mounting frame.

[0009] Optionally, a moving groove is provided on one side of the mounting bracket near one of the slide rails. A retainer is slidably connected inside the moving groove. One end of the retainer is fixedly connected to the connecting bracket. A second drive motor is fixedly installed on one side of the retainer. The output end of the second drive motor is connected to the first extrusion roller. A third drive motor is fixedly installed on one side of the mounting bracket. The output end of the third drive motor is connected to the second extrusion roller.

[0010] Optionally, a first conductive slip ring is installed at both ends of the first heating roller in a pair of heating rollers, and a second conductive slip ring is connected to both ends of the second heating roller, with the end of the second conductive slip ring away from the roller body being fixedly connected to the inner wall of the mounting frame.

[0011] Optionally, the bonding and bonding mechanism also includes a pair of guide rollers located at the feed end. The two ends of the first guide roller are rotatably connected to a first connecting seat, and the two ends of the second guide roller are rotatably connected to a second connecting seat. The second connecting seat is fixedly connected to the mounting frame, and a fine-tuning mechanism is provided inside the mounting frame.

[0012] Optionally, the fine-tuning mechanism includes a fixed frame that is fixedly connected to the mounting bracket. The fixed frame has movable blocks that are slidably installed inside. The bottom end of each pair of movable blocks is fixedly connected to the top end of the first conductive slip ring and the first connecting seat at their corresponding positions. The top end of the fixed frame has a connecting sleeve that is slidably installed inside. The bottom end of the connecting sleeve has a buffer spring that is fixedly installed inside. The bottom end of the buffer spring is fixedly connected to the top end of the movable block. The center of the top end of the fixed frame has an adjusting screw that is threadedly connected to the bottom end of the adjusting screw and the top end of the connecting sleeve.

[0013] Optionally, the top of the mounting frame is provided with an operating slot, and a cover plate is connected to the operating slot via a hinge. The outer end of the mounting frame is provided with a controller and a touch panel, and several bearing rollers are rotatably installed inside the box.

[0014] This utility model has the following advantages and beneficial effects: This invention utilizes a reciprocating oscillating fan driven by a drive component within the cooling mechanism to create a wide-angle sweeping effect, allowing the cooling airflow to dynamically and evenly sweep across the upper and lower surfaces of the composite material. Compared to existing technologies where continuous direct blowing causes localized temperature drops leading to shrinkage and warping, this device effectively eliminates cooling dead zones through dynamic sweeping, preventing thermal stress concentration in the foam material due to severe localized temperature differences. This prevents wavy lines, warping, or shrinkage deformation on the finished product surface, improving the flatness and shaping quality of the composite board.

[0015] The extrusion station employs a structural design with a spacing adjustment assembly between the first and second extrusion rollers. This spacing adjustment assembly allows the equipment to quickly adjust the relative displacement and clamping force between the two rollers according to the thickness of the lightweight foam material. This prevents the brittle foam from being crushed or damaged due to excessive spacing, while also avoiding insufficient pressure leading to voids or weak adhesion due to excessive spacing, ensuring a dense and uniform composite effect under various working conditions.

[0016] Before the material enters the high-pressure extrusion zone, the heating rollers re-heat and activate the adhesive layer on the surface of the foam or nonwoven fabric, rapidly raising the surface temperature of the adhesive through contact heat transfer. This structure effectively compensates for the decrease in adhesive activity caused by environmental cooling during post-coating conveying, ensuring that the hot melt adhesive is in its optimal tack state at the moment of pressing, improving the peel strength between the nonwoven fabric and the lightweight foam, and solving the quality risks of easy delamination and displacement of the finished product. Attached Figure Description

[0017] Figure 1 The overall structure of the lightweight foam-coated nonwoven fabric bonding device of this utility model Figure 1 ; Figure 2 The overall structure of the lightweight foam-coated nonwoven fabric bonding device of this utility model Figure 2 ; Figure 3 This invention relates to a partial bonding device for lightweight foam-coated nonwoven fabric. Figure 1 ; Figure 4 This is a cross-sectional view of the bonding device for lightweight foam-coated nonwoven fabric according to this utility model. Figure 5 This invention relates to a partial bonding device for lightweight foam-coated nonwoven fabric. Figure 2 ; Figure 6 This utility model Figure 5 Enlarged view of point A.

[0018] Reference numerals: 1. Adhesive bonding mechanism; 101. Housing; 102. Mounting bracket; 103. Fixing bracket; 104. First heating roller; 105. Controller; 106. Third drive motor; 107. Second drive motor; 108. Moving groove; 109. Pneumatic telescopic rod; 110. Bearing roller; 111. Slide rail; 112. First conductive slip ring; 113. Second guide roller; 114. Second extrusion roller; 115. First extrusion roller; 11 6. Moving block; 117. Buffer spring; 118. Connecting sleeve; 119. Adjusting screw; 120. Connecting frame; 121. Retainer; 122. Cover plate; 124. First connecting seat; 125. First guide roller; 126. Second heating roller; 127. Second connecting seat; 128. Second conductive slip ring; 2. Cooling mechanism; 201. Centrifugal fan; 202. Movable seat; 203. Fan cover; 204. Drive component; 205. T-pipe. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] Example like Figures 1-6 As shown, a bonding device for lightweight foam covered with nonwoven fabric includes a bonding and bonding mechanism 1 and a cooling mechanism 2 arranged sequentially along the material conveying direction.

[0022] The bonding and laminating mechanism 1 includes a housing 101 and a mounting frame 102 fixedly installed on the top of the housing 101. The mounting frame 102 is provided with a pair of heating rollers (including a first heating roller 104 and a second heating roller 126) and a pair of extrusion rollers (including a first extrusion roller 115 and a second extrusion roller 114). The pair of heating rollers are located on the feeding side of the pair of extrusion rollers and are used to preheat and activate the material. A spacing adjustment structure is provided between the pair of extrusion rollers to drive the pair of extrusion rollers to generate relative displacement so as to extrude and laminate the preheated material.

[0023] The cooling mechanism 2 includes at least one pair of rotatably arranged fan covers 203. The outer end of the fan cover 203 is connected to a drive component 204, which is used to drive the fan cover 203 to reciprocate and swing to release air.

[0024] Furthermore, the cooling mechanism 2 specifically includes four pairs of movable seats 202 distributed on the upper and lower sides of the material conveying path, of which two pairs of movable seats 202 are fixedly installed on the inner top of the mounting frame 102, and the other two pairs of movable seats 202 are fixedly installed on the inner bottom of the box 101. Each pair of movable seats 202 is rotatably connected to a fan cover 203.

[0025] Furthermore, a centrifugal fan 201 is fixedly connected to the top of the mounting bracket 102. A three-way pipe 205 is fitted onto the output end of the centrifugal fan 201. The two branch ports of the three-way pipe 205 are connected to the input ends of a pair of fan shrouds 203 on their corresponding sides via pipes. A filter screen is installed at the input end of the centrifugal fan 201. A drive component 204 is connected to the fan shroud 203. The drive component 204 is preferably a stepper motor. The control end of the stepper motor is electrically connected to the controller 105. The controller 105 has a preset reciprocating swing program. By sending periodic forward and reverse pulse signals to the stepper motor, it controls the fan shroud 203 to reciprocate and sweep air within a preset angle range (e.g., ±45°). The drive motor is fixedly installed on one side of the movable base 202, and its output shaft is connected to the fan shroud 203 for transmission. It is used to drive the fan shroud 203 to reciprocate and swing to output air, adjust the air outlet angle, and enable the cooling airflow to dynamically and evenly cover the bonded composite material, avoiding deformation caused by local temperature differences.

[0026] Furthermore, the spacing adjustment component includes a pair of slide rails 111 fixedly installed on both sides inside the mounting frame 102. A connecting frame 120 is slidably connected between the pair of slide rails 111. Pneumatic telescopic rods 109 are installed on both sides of the top of the mounting frame 102. The output end of the pneumatic telescopic rod 109 is fixedly connected to the top of the connecting frame 120 and is used to drive the connecting frame 120 to rise and fall along the slide rails 111, thereby driving the first extrusion roller 115 to rise and fall. The pneumatic telescopic rod 109 is not only used to drive the rise and fall, but also to precisely control the downward pressure of the first extrusion roller 115, thereby adapting to the bonding pressure requirements of materials of different thicknesses and materials, effectively improving the adaptability and firmness of bonding. The first extrusion roller 115 of the pair of extrusion rollers is rotatably connected to the bottom end of the connecting frame 120, and the second extrusion roller 114 is rotatably connected to the inside of the mounting frame 102.

[0027] Furthermore, a moving groove 108 is provided on one side of the mounting frame 102 near one of the slide rails 111. A retainer 121 is slidably installed inside the moving groove 108. One end of the retainer 121 is fixedly connected to one end of the connecting frame 120. A second drive motor 107 is fixedly installed on one side of the retainer 121. The output end of the second drive motor 107 is connected to the first extrusion roller 115. A third drive motor 106 is fixedly installed on one side of the mounting frame 102. The output end of the third drive motor 106 is connected to the second extrusion roller 114. The second drive motor 107 and the third drive motor 106 rotate in opposite directions, providing continuous power to the first extrusion roller 115 and the second extrusion roller 114 respectively, ensuring stable power during the extrusion process. Since the retainer 121 is fixedly connected to the connecting frame 120, the retainer 121 can move up and down synchronously with the connecting frame 120, thereby ensuring that the transmission between the second drive motor 107 and the liftable first extrusion roller 115 remains stable.

[0028] Furthermore, heating coils (or other heating elements) are fixedly installed inside both the first heating roller 104 and the second heating roller 126 for heating the roller body. First conductive slip rings 112 are installed at both ends of the first heating roller 104; second conductive slip rings 128 are connected to both ends of the second heating roller 126, with the end of the second conductive slip ring 128 furthest from the roller body fixedly connected to the inner wall of the mounting frame 102. The first conductive slip rings 112 and 128 can stably supply power to the internal heating coils while the first heating roller 104 and the second heating roller 126 rotate, preventing wire entanglement from affecting roller rotation, ensuring a continuous and stable preheating effect for the heating rollers, and improving the reliability of the preheating operation.

[0029] Furthermore, the bonding and bonding mechanism 1 also includes a pair of guide rollers located at the feed end, including an upper first guide roller 125 and a lower second guide roller 113. The two ends of the first guide roller 125 are rotatably connected to a first connecting seat 124, and the two ends of the second guide roller 113 are rotatably connected to a second connecting seat 127, and the second connecting seat 127 is fixedly connected to the mounting frame 102. The first guide roller 125 and the second guide roller 113 can guide the lightweight foam and non-woven fabric, ensuring that the material remains flat during the conveying and bonding process, avoiding problems such as wrinkles and deviations, and ensuring the stability of material conveying and the accuracy of bonding. The mounting frame 102 is provided with a fine-tuning mechanism for adjusting the height of the first heating roller 104 and the first guide roller 125.

[0030] Furthermore, the fine-tuning mechanism includes a fixed frame 103 fixedly connected to the mounting frame 102. Movable blocks 116 are slidably installed inside the fixed frame 103. The bottom end of each pair of movable blocks 116 is fixedly connected to the top end of the first conductive slip ring 112 and the first connecting seat 124 at their corresponding positions. Connecting sleeves 118 are slidably installed at the top end of the fixed frame 103. Buffer springs 117 are fixedly installed at the bottom end of each connecting sleeve 118, and the bottom end of each buffer spring 117 is fixedly connected to the top end of the movable block 116. An adjusting screw 119 is threadedly connected to the center of the top end of the fixed frame 103, and the bottom end of the adjusting screw 119 is rotatably connected to the top end of the connecting sleeve 118. Rotating the adjusting screw 119 can drive the connecting sleeve 118 to rise and fall, adjusting the height of the movable blocks 116 in conjunction with the buffer springs 117, thereby driving the first heating roller 104 and the first guide roller 125 to adapt to materials of different thicknesses.

[0031] Furthermore, the top of the mounting frame 102 is provided with an operating slot, and a cover plate 122 is connected to the operating slot via a hinge. Several bearing rollers 110 are rotatably installed inside the housing 101. A controller 105 and a touch panel are provided at the outer end of the mounting frame 102 or on one side of the equipment. The controller 105 (such as a PLC controller or motor driver) can precisely control the operating parameters of each drive motor and pneumatic component, and the touch panel facilitates the setting and adjustment of the equipment's operating parameters by the operator.

[0032] Specifically, the working principle of this lightweight foam-coated nonwoven fabric bonding equipment is as follows: During operation, the operator first sets parameters such as heating temperature, extrusion pressure, and fan oscillation frequency via a touch panel. The controller 105 synchronously regulates the operation of each component. Lightweight foam is placed on the surface of the nonwoven fabric. A hot melt adhesive is pre-coated onto the surface of the lightweight foam in the previous process. The composite nonwoven fabric and lightweight foam are conveyed forward sequentially through the first heating roller 104 and the second heating roller 126, the first extrusion roller 115 and the second extrusion roller 114, the first guide roller 125 and the second guide roller 113. The first guide roller 125 and the second guide roller 113 provide guidance and positioning. Rotating the adjusting screw 119 allows for fine-tuning of the height of the first heating roller 104 to match the material thickness.

[0033] After the equipment is started, the first conductive slip ring 112 and the second conductive slip ring 128 provide stable power to the heating coils inside the first heating roller 104 and the second heating roller 126, heating and activating the hot melt adhesive between the nonwoven fabric and the lightweight foam. The material enters the extrusion station, and at the same time, the pneumatic telescopic rod 109 drives the connecting frame 120 to slide along the slide rail 111, adjusting the distance between the first extrusion roller 115 and the second extrusion roller 114, so as to uniformly hot press the foam and nonwoven fabric together. Meanwhile, the second drive motor 107 and the third drive motor 106 drive the extrusion rollers to rotate and convey the material.

[0034] As the lightweight foam moves, the nonwoven fabric is continuously pressed and bonded to it. The bonded composite material is supported and conveyed to the cooling area by the bearing roller 110. The centrifugal fan 201 is started, and outside air enters after being filtered by the filter screen. The airflow is then evenly distributed to each fan hood 203 through the three-way pipe 205. The drive motor 204 drives the fan hood 203 to swing back and forth to adjust the air outlet angle, so that the cooling airflow evenly covers the surface of the material, accelerates the solidification of the hot melt adhesive, and enables the cooling airflow to dynamically and evenly cover the upper and lower surfaces of the material. This avoids the local heat stress concentration and warping deformation caused by traditional fixed direct blowing, ensures that the composite product cools down and sets quickly and remains flat, and improves the bonding effect between the nonwoven fabric and the lightweight foam. The entire process of automatic heating activation, extrusion bonding and cooling setting of lightweight foam and nonwoven fabric is completed, ensuring the quality of the finished product and production efficiency.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bonding device for lightweight foam coated with nonwoven fabric, characterized in that: It includes an adhesive bonding mechanism (1) and a cooling mechanism (2) arranged sequentially along the material conveying direction; The bonding and laminating mechanism (1) includes a housing (101), and a mounting frame (102) is fixedly installed on the top of the housing (101). The mounting frame (102) is provided with a pair of heating rollers (104, 126) and a pair of extrusion rollers (115, 114). The pair of heating rollers (104, 126) are located on the feeding side of the pair of extrusion rollers (115, 114). A spacing adjustment component is provided between the pair of extrusion rollers (115, 114) for extruding and laminating the preheated material. The cooling mechanism (2) includes at least one pair of rotatably arranged fan covers (203), and the outer end of the fan cover (203) is connected to a drive component (204). The drive component (204) is used to drive the fan cover (203) to reciprocate and swing to release air.

2. The bonding equipment for lightweight foam-coated nonwoven fabric according to claim 1, characterized in that: The cooling mechanism (2) includes four pairs of movable seats (202) distributed on the upper and lower sides of the material conveying path. Two pairs of movable seats (202) are fixedly installed on the inner top of the mounting frame (102), and the other two pairs of movable seats (202) are fixedly installed on the inner bottom of the box (101). The fan hood (203) is rotatably connected between each pair of movable seats (202) to simultaneously swing and cool the upper and lower surfaces of the material.

3. The bonding equipment for lightweight foam-coated nonwoven fabric according to claim 2, characterized in that: A centrifugal fan (201) is fixedly connected to the top of the mounting bracket (102). A three-way pipe (205) is fitted at the output end of the centrifugal fan (201). The two branch ports of the three-way pipe (205) are connected to the input ends of a pair of fan covers (203) on their corresponding sides through pipes. A filter screen is installed at the input end of the centrifugal fan (201). The driving component (204) is a drive motor. The drive motor is fixedly installed on one side of the movable seat (202), and its output shaft is connected to the fan cover (203) in a transmission connection.

4. The bonding equipment for lightweight foam-coated nonwoven fabric according to claim 1, characterized in that: The spacing adjustment assembly includes a pair of slide rails (111) fixedly connected to both sides inside the mounting frame (102), a connecting frame (120) slidably connected between the pair of slide rails (111), pneumatic telescopic rods (109) are installed on both sides of the top of the mounting frame (102), the output end of the pneumatic telescopic rod (109) is fixedly connected to the top of the connecting frame (120), the bottom end of the connecting frame (120) is rotatably connected to the first extrusion roller (115) of a pair of extrusion rollers (115, 114), and the second extrusion roller (114) is rotatably connected to the mounting frame (102).

5. The bonding equipment for lightweight foam-coated nonwoven fabric according to claim 4, characterized in that: The mounting bracket (102) has a moving groove (108) on one side near one of the slide rails (111). A retainer (121) is slidably connected inside the moving groove (108). One end of the retainer (121) is fixedly connected to the connecting bracket (120). A second drive motor (107) is fixedly installed on one side of the retainer (121). The output end of the second drive motor (107) is drivenly connected to the first extrusion roller (115). A third drive motor (106) is fixedly installed on one side of the mounting bracket (102). The output end of the third drive motor (106) is drivenly connected to the second extrusion roller (114).

6. The bonding equipment for lightweight foam-coated nonwoven fabric according to claim 1, characterized in that: The first heating roller (104) of the pair of heating rollers (104, 126) is equipped with a first conductive slip ring (112) at both ends, and the second heating roller (126) is connected to a second conductive slip ring (128) at both ends. The end of the second conductive slip ring (128) away from the roller body is fixedly connected to the inner wall of the mounting frame (102).

7. The bonding equipment for lightweight foam-coated nonwoven fabric according to claim 1, characterized in that: The bonding and bonding mechanism (1) further includes a pair of guide rollers (125, 113) located at the feed end. The two ends of the first guide roller (125) are rotatably connected to a first connecting seat (124), and the two ends of the second guide roller (113) are rotatably connected to a second connecting seat (127). The second connecting seat (127) is fixedly connected to the mounting frame (102), and the mounting frame (102) is provided with a fine-tuning mechanism.

8. The bonding equipment for lightweight foam-coated nonwoven fabric according to claim 7, characterized in that: The fine-tuning mechanism includes a fixed frame (103) fixedly connected to a mounting frame (102). A movable block (116) is slidably installed inside the fixed frame (103). The bottom end of each pair of movable blocks (116) is fixedly connected to the top end of the first conductive slip ring (112) and the first connecting seat (124) at their corresponding positions. A connecting sleeve (118) is slidably installed at the top end of the fixed frame (103). A buffer spring (117) is fixedly installed at the bottom end of the connecting sleeve (118). The bottom end of the buffer spring (117) is fixedly connected to the top end of the movable block (116). An adjusting screw (119) is threadedly connected at the center of the top end of the fixed frame (103). The bottom end of the adjusting screw (119) is rotatably connected to the top end of the connecting sleeve (118).

9. The bonding equipment for lightweight foam-coated nonwoven fabric according to claim 1, characterized in that: The top of the mounting frame (102) is provided with an operating slot, and a cover plate (122) is connected to the operating slot by a hinge. The outer end of the mounting frame (102) is provided with a controller (105) and a touch panel. Several bearing rollers (110) are rotatably installed inside the box (101).

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