Friction material detection equipment

Abstract

The utility model relates to the technical field of single-ring carbon strip processing, in particular to friction material detection equipment, which comprises a conveying mechanism and a material moving mechanism which are mounted on an operating table, and further comprises a pressing mechanism, a visual detection mechanism and a cone depth detection mechanism which are sequentially mounted on the operating table from left to right and are positioned on the same axis with the conveying mechanism, the downward pressing mechanism comprises a vertical frame which is in a C shape. According to the detection equipment for the friction material, through cooperation of the conveying mechanism and the material moving mechanism, a product can be transferred to the first bearing table to be placed, a pressing block is driven by a pressing part to press downwards till the pressing block extends into an inner ring of the product, a carrier can be pressed downwards to a guide plate, and then a return air cylinder drives a return plate to move; and the movement of the back-shifting plate is located in the back-shifting opening, so that the carriers can be shifted away and collected, and meanwhile, the next group of carriers can be conveniently removed, so that the whole equipment is simpler in structure, the number of parts and the complexity are reduced, and the detection cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to single ring carbon strip processing technical field, concretely to a detection equipment of friction material. BACKGROUND

[0002] Single ring carbon strip, sometimes also called carbon brush or electric brush, is usually used in motor, generator and other rotating electrical equipment as sliding contact component to conduct current, which is made of high conductivity and wear resistance material such as graphite or graphite composite material impregnated with metal to ensure stable work under high speed operation and high temperature conditions.

[0003] At present, the traditional feeding mode is manually moved to the detection position, and the conveying belt is conveyed to the specified position, and then moved by the material moving assembly. Manual moving for a long time will cause fatigue and reduce the detection efficiency. At the same time, when the conveying belt moves the product to the detection position, a carrier needs to be placed in the product, so as to reduce the damage to the product during the material moving process. Of course, during the detection process, the carrier in the product also needs to be removed, so a special mechanical arm is needed to complete the removal of the carrier, thereby increasing the cost of product detection. At the same time, the traditional equipment can only realize single detection. When the next group of detection is needed, the new group of products to be detected needs to be moved to the detection position manually or by other ways. The frequent product transfer and repositioning process consumes a lot of time, which reduces the overall detection efficiency. UTILITARIAN CONTENT

[0004] In order to achieve the above purpose, the utility model provides the following technical scheme: a detection equipment of friction material, which comprises a conveying mechanism and a material moving mechanism installed on an operation table, and further comprises a lower pressing mechanism, a visual detection mechanism and a cone depth detection mechanism installed on the operation table from left to right in sequence and located on the same axis line as the conveying mechanism.

[0005] The lower pressing mechanism comprises an upright frame, the upright frame is C-shaped, a supporting table one is fixed on the upright frame, and a lower pressing part is installed, the bottom end of the lower pressing part is fixed with pressure blocks which are vertically and symmetrically distributed with the supporting table one, a guide plate is further fixed on the inner side of the upright frame and located below the supporting table one, a return opening is formed in the guide plate, a return cylinder is installed below the guide plate on the operation table, and a return plate is fixed in the return opening through the piston rod of the return cylinder.

[0006] Further, the lower pressing part comprises a shelf plate fixed on the upright frame, a belt type lead screw device is installed on the shelf plate, a lifting plate is slidably connected to the guide column of the shelf plate and fixed with the nut end of the belt type lead screw device, a plurality of lifting columns are fixed to the bottom of the lifting plate and penetrate through the upright frame, and the pressure blocks are connected with the lifting columns.

[0007] Further, the visual detection mechanism comprises a support table fixed on the operation table, a pair of hinged plates, a pair of adjusting plates and a driving motor located below the support table, the driving end of the driving motor penetrates through the support table and is fixed with a supporting table two, the opposite sides of the two hinged plates are hinged with adjusting rods, the adjusting plates are provided with waist holes, the adjusting rods are fixed on the adjusting plates through the waist holes through screws, the outer sides of the adjusting rods are provided with two groups of locking parts, and the two groups of locking parts are respectively fixed with a positioning reference plate and a visual detection camera.

[0008] Further, the locking part comprises a plurality of lock blocks locked on the adjusting rod, the total number of the lock blocks is three, and a vertical rod is further locked on the lock blocks, the positioning reference plate is connected with two vertical rods with equal heights, and the other vertical rod is fixed with a mounting plate, and the visual detection camera is fixed on the mounting plate.

[0009] Further, the cone depth detection mechanism comprises a detection frame and a supporting table three fixed on the operation table, the top of the detection frame is provided with a double-acting cylinder, the bottom end of the piston rod of the double-acting cylinder is fixed with a detection block vertically symmetrical with the supporting table three, the top of the double-acting cylinder is fixed with a plate body, the piston rod of the double-acting cylinder penetrates through the plate body and is fixed with a limiting plate, and the bottom of the limiting plate is fixed with a guide rod one penetrating through the plate body.

[0010] Further, a plurality of down-top cylinders are further installed on the detection frame and a plurality of guide rods two are further penetrated, the piston rods of the plurality of down-top cylinders are fixed with ring blocks fixed with the guide rods two, the detection block can penetrate through the ring blocks, and the ring blocks are located above the supporting table three.

[0011] Further, the top of the supporting table three is formed with a wide edge extending upwards, and three narrow edges are formed on the wide edge.

[0012] Further, a cleaning mechanism is further installed on the operation table, the cleaning mechanism comprises a cleaning frame and a lower cylinder fixed on the operation table, the inner side of the lower cylinder is fixed with a supporting cylinder, the top of the cleaning frame is provided with a push cylinder and a plurality of push rods penetrating through the cleaning frame, the piston rod of the push cylinder is fixed with an upper cylinder connected with the push rods, the upper cylinder is vertically symmetrical with the lower cylinder, and the inner side of the upper cylinder is further provided with an air pipe.

[0013] Further, the bottom of the supporting cylinder is a cross plate, four ends of the cross plate extend upwards and are formed with cylinder bodies, and the top of each cylinder body is formed with a convex edge.

[0014] Compared with the prior art, the technical scheme of the application has the following beneficial effects:

[0015] This friction material testing equipment, through the cooperation of a conveying mechanism and a material transfer mechanism, can transfer the product to a support platform and place it on it. The pressing part drives the pressing block to press down until the pressing block extends into the inner ring of the product, and can press the carrier onto the guide plate. Then, the return cylinder drives the return plate to move, and the movement of the return plate forms a return port, which can remove and collect the carrier. It also facilitates the removal of the carrier in the next group, making the overall equipment structure simpler, reducing the number of parts and complexity, thereby reducing the testing cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a three-dimensional view of the pressing mechanism in this utility model;

[0018] Figure 3 This is a three-dimensional diagram of the visual inspection mechanism in this utility model;

[0019] Figure 4 This is a three-dimensional view of the cone depth detection mechanism of this utility model;

[0020] Figure 5 This is a three-dimensional view of the cleaning mechanism in this utility model;

[0021] Figure 6 This utility model Figure 5 A schematic diagram of the cross-sectional structure;

[0022] Figure 7 This is a schematic diagram of the product structure in this utility model;

[0023] Figure 8 This is a three-dimensional view of the conveying mechanism in this utility model;

[0024] Figure 9 This is a three-dimensional view of the material transfer mechanism in this utility model.

[0025] In the diagram: 1. Operating platform; 2. Conveying mechanism; 3. Transfer mechanism; 4. Pressing mechanism; 41. Frame; 42. Shelf plate; 43. Belt-type screw device; 44. Lifting plate; 45. Lifting column; 46. Pressure block; 47. Placement platform one; 48. Guide plate; 49. Return cylinder; 410. Return plate; 411. Return port; 5. Vision inspection mechanism; 51. Hinge plate; 52. Adjusting plate; 53. Waist hole; 54. Adjusting rod; 55. Locking block; 56. Frame; 57. Mounting plate; 58. Vision inspection. 59. Camera; 510. Positioning reference plate; 511. Support platform; 512. Drive motor; 513. Second placement platform; 6. Cone depth detection mechanism; 61. Detection frame; 62. Third placement platform; 63. Double-acting cylinder; 64. Plate; 65. Limiting plate; 66. Guide rod one; 67. Guide rod two; 68. Detection block; 69. Lowering cylinder; 610. Ring block; 7. Cleaning mechanism; 71. Cleaning frame; 72. Pushing cylinder; 73. Pushing rod; 74. Upper cylinder; 75. Lower cylinder; 76. Air duct; 77. Placement cylinder. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-9 The friction material testing device in this embodiment includes an operating table 1, and a conveying mechanism 2 and a material transfer mechanism 3 installed on the table surface of the operating table 1. From left to right, the operating table 1 is equipped with a pressing mechanism 4, a visual inspection mechanism 5, a cone depth detection mechanism 6, and a cleaning mechanism 7, which are coaxial with the conveying mechanism 2 and opposite to the material transfer mechanism 3.

[0028] In the above structure, the product is transported to the end via a conveying mechanism, and then transferred via a transfer mechanism. The transfer mechanism moves the product carrying the carrier to a pressing mechanism, which removes and collects the carrier. Therefore, carrier removal can be accomplished with a simple structure, thereby reducing the cost of automated inspection and facilitating maintenance. The transfer mechanism then flips the product during the transfer process and places it in a vision inspection mechanism for damage detection. The transfer mechanism then sequentially moves the product to a cone depth detection mechanism and a cleaning mechanism to complete the detection of the inner cone depth and surface cleaning. This allows two different sets of inspections to be completed on a single device, thus reducing inspection costs, minimizing space requirements, and effectively improving inspection efficiency.

[0029] Among them, such as Figure 8 The conveying mechanism 2 is a loading conveyor fixed on the operating table 1. A baffle is fixed at the tail end of the loading conveyor, a through-beam photoelectric sensor is installed in the middle, and a limit cylinder is installed on the side. The piston rod of the limit cylinder is fixed with a T-shaped limit block. One side of the baffle has a V-shaped opening adapted to the product. The loading conveyor is responsible for moving the product carrying the carrier to the baffle. Simultaneously, the product passes through the through-beam photoelectric sensor. After the product passes, the limit cylinder drives the limit block to push out, blocking subsequent products and acting as a pre-waiting mechanism.

[0030] Other examples Figure 9 The material transfer mechanism 3 consists of a push cylinder mounted on the operating table 1 and a push plate slidably connected to the piston rod of the push cylinder. Five pairs of columns are fixed to the top of the push plate, and an upper plate is fixed between the tops of the columns. Each of the four pairs of columns is slidably connected to a slider, and a concave block is slidably connected between a pair of columns. A rotary cylinder is mounted on the back of the concave block. A clamping cylinder is mounted on the rotating end of the rotary cylinder and on the other four sliders. Five push cylinders are mounted on the upper plate and are respectively connected to the corresponding sliders and concave blocks. One of the clamping cylinders near the feeding conveyor is fixed with an L-shaped clamping plate at its clamping end. The two L-shaped clamping plates have their opposite sides forming an arc. The other clamping cylinders have oppositely distributed semi-circular clamping plates fixed to their double clamping ends. The opposite sides of the two opposite semi-circular clamping plates are provided with inner grooves.

[0031] The concave surface formed by the concave block allows the rotating end of the rotary cylinder to be located within the concave surface. This ensures that the clamping cylinder on the rotating end is on the same axis as the other clamping cylinders. Initially, the two L-shaped clamping plates are closed. Through the cooperation of the pushing cylinder and the downward pushing cylinder, the push plate, slider, and concave block are moved, allowing the two L-shaped clamping plates to be inserted into the inner ring of the carrier. Then, the clamping cylinder opens and fixes the carrier, thus preventing damage to the product during material handling. The product is then clamped by the clamping cylinder on the concave plate and the semi-circular clamping plate, positioning it precisely within the inner groove and limiting its movement to prevent damage from direct hard clamping. The rotary cylinder then rotates the product group, and with the cooperation of subsequent clamping cylinders and semi-circular clamping plates, the products are transferred sequentially.

[0032] like Figure 2As shown, the pressing mechanism 4 includes a stand 41 fixed on the operating table 1. The stand 41 is C-shaped, and a support platform 47 is fixed on the inner side of the stand 41. A through hole is opened on the support platform 47, and a guide cylinder is formed around the outside of the through hole. A frame plate 42 is fixed on the top of the stand 41. A belt-type screw device 43 is installed between the frame plate 42 and the stand 41. A lifting plate 44 that slides with the four plate columns of the frame plate 42 is fixed at the nut end of the belt-type screw device 43. Four lifting columns 45 that pass through the stand 41 are fixed at the bottom of the lifting plate 44. A pressure block 46 that is perpendicular and symmetrical to the through hole is fixed between the bottoms of the four lifting columns 45. A guide plate 48 located below the support platform 47 is fixed on the inner side of the stand 41.

[0033] The product carrying the carrier is transferred to the receiving platform by the material transfer mechanism, so that the carrier is exactly above the through hole. The belt-driven screw device drives the lifting plate to move down, so that the lifting column can drive the pressure block to press into the inner ring of the product, thereby pushing the carrier in the product to the guide plate for collection, completing the carrier removal operation.

[0034] Further explanation: A return cylinder 49 is installed on the surface of the operating table 1, located below the guide plate 48. A return block 410 is fixed to the piston rod of the return cylinder 49. The return block 410 is convex in shape. The first end of the guide plate 48 has a return opening 411 that matches the protruding end of the return block 410. When the carrier falls onto the guide plate, the return cylinder drives the return block to move, thereby pushing the carrier towards the rear end of the guide plate. This does not hinder the removal of the next set of carriers and also facilitates the collection of the carrier.

[0035] like Figure 3 The visual inspection mechanism 5 includes a support platform 510 fixed on the operating table 1 and a drive motor 511 located below the support platform 510. The drive end of the drive motor 511 passes through the support platform 510 and is fixed to a second receiving platform 512. A support unit is also installed on the operating table 1, on which a positioning reference plate 59 is fixed and a visual inspection camera 58 is mounted. During product transfer, the rotary cylinder in the transfer mechanism adjusts the product's rotation by driving the clamping cylinder to rotate. After rotation, the product is placed on the second receiving platform, and the drive motor drives the second receiving platform to rotate, causing the product to rotate as well. The positioning reference plate assists the visual inspection camera in completing the product damage detection.

[0036] Further explanation: The support unit includes two hinge plates 51 and two adjusting plates 52 fixed on the operating table 1. The adjusting plates 52 and the corresponding hinge plates 51 are located on the same axis. The adjusting plates 52 are higher than the hinge plates 51. The adjusting plates 52 have waist holes 53. The hinge plates 51 are hinged to the adjusting rods 54. The other end of the adjusting rods 54 is fixed to the adjusting plates 52 by screws through the waist holes 53. Two locking blocks 55 are locked on the outside of the adjusting rods 54 on the front side. One locking block 55 is locked on the outside of the adjusting rods 54 on the back side. The inner side of the locking block 55 is also locked with a vertical rod 56. The two vertical rods 56 on the left side are higher than the vertical rods 56 on the right side. The positioning reference plate 59 is fixed to the two vertical rods 56 on the left side. The top of the vertical rod 56 on the right side is fixed with a mounting plate 57 connected to the visual inspection camera 58. By loosening the screw, the adjusting rod moves the screw into the waist hole, thereby adjusting the angle of the vision inspection camera. At the same time, by moving the locking block to lock it, the position of the positioning reference plate and the vision inspection camera can be adjusted as needed.

[0037] like Figure 4 The cone depth detection mechanism 6 includes a detection frame 61 fixed on the operating table 1 and a support platform 62 located below the detection frame 61. The top of the support platform 62 has a wide side, and three narrow sides are formed on the wide side. A double-acting cylinder 63 is installed on the top of the detection frame 61. A detection block 68, perpendicular and symmetrical to the support platform 62, is fixed to the bottom of the piston rod of the double-acting cylinder 63. A plate 64 is fixed to the top of the double-acting cylinder 63. The piston rod of the double-acting cylinder 63 passes through the plate 64. A guide rod 66 passes through the plate 64. A limiting plate 65, which is fixed to the top of the guide rod 66, is fixed to the top of the piston rod. The wide and narrow sides on the support platform 63 can fit together to support the product. Then, the double-acting cylinder drives the piston rod to push down, so that the detection block pushes down to complete the detection of the inner cone depth of the product. At the same time, the piston rod also drives the guide rod to move through the limiting plate, thereby improving the stability of the detection block's lifting and lowering.

[0038] Further explanation: The top of the testing frame 61 is equipped with a pair of downward-pressing cylinders 69 and four guide rods 67. A ring block 610, connected to the guide rods 67, is fixed between the piston rods of the two downward-pressing cylinders 69. The testing block 68 can pass through the ring block 610. When it is necessary to press the product down to detect the cone depth, the downward-pressing cylinders first drive the ring block down. The guide rods guide the ring block to rise and fall. The downward pressure of the ring block limits the product, preventing the testing block from shifting during cone depth detection, thus preventing damage to the product.

[0039] like Figure 5The cleaning mechanism 7 includes a cleaning frame 71 and a lower cylinder 75 fixed on the operating table 1. A receiving cylinder 77 is fixed inside the lower cylinder 75. The bottom of the receiving cylinder 77 is a cross-shaped plate, and the four ends of the cross-shaped plate extend upward to form a cylinder body. Three protruding edges are formed on the top of the cylinder body. A push cylinder 72 and two push rods 73 are installed on the top of the cleaning frame 71. The piston rod of the push cylinder 72 is fixed to an upper cylinder 74, which is fixed to the push rods 73. The upper cylinder 74 is opposite to the lower cylinder 75, and the diameter of the upper cylinder 74 is the same as that of the lower cylinder 75. An air duct 76 is installed inside the upper cylinder 74. The product is transferred to the receiving cylinder by the material transfer mechanism. Then, the push cylinder, guided by the push rods, drives the upper and lower cylinders to close. The air duct is then activated, thereby cleaning impurities on the outside of the product.

[0040] The working principle of the above embodiments is as follows:

[0041] First, the conveyor mechanism transports the product carrying the carrier to the designated position. Then, one of the clamping cylinders in the transfer mechanism moves the product onto the first receiving platform. Next, a belt-driven screw device drives the lifting plate to move downwards, while the lifting column pushes the pressure block downwards until the carrier in the product is pressed out and falls onto the guide plate. A return cylinder then moves the return plate in the return port, pushing the product backwards until it is removed from the guide plate and collected. Finally, the transfer mechanism clamps and limits the product and flips it over to place it onto the second receiving platform. The product is inspected by a visual inspection camera while the drive motor rotates the second support platform to detect damage on the outside. After inspection, the transfer mechanism moves the product back onto the second support platform. The lower cylinder pushes the ring block down to position the product. The double-acting cylinder then pushes the detection block down onto the inner ring of the product to detect the cone depth. After inspection, the transfer mechanism moves the product onto the support cylinder. The push cylinder then pushes the upper cylinder to fit with the lower cylinder to cover the product. The air duct is then activated to remove impurities from the product.

[0042] In summary, automated testing lines can complete the removal and collection of carriers using simple equipment, and can also perform two sets of tests on the same equipment. Therefore, they can effectively reduce the cost of product testing and improve efficiency.

[0043] The entire workflow is now complete, and anything not described in detail in this specification is existing technology known to those skilled in the art.

[0044] It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing device for friction materials, comprising a conveying mechanism (2) and a material transfer mechanism (3) mounted on an operating table (1), characterized in that: It also includes a pressing mechanism (4), a visual inspection mechanism (5), and a cone depth inspection mechanism (6) installed on the operating table (1) from left to right, which are located on the same axis as the conveying mechanism (2); The pressing mechanism (4) includes a stand (41), which is C-shaped. A support platform (47) is fixed on the stand (41), and a pressing part is installed on it. The bottom end of the pressing part is fixed with a pressing block (46) that is symmetrically distributed with respect to the support platform (47). A guide plate (48) located below the support platform (47) is also fixed on the inner side of the stand (41). A return port (411) is opened on the guide plate (48). A return cylinder (49) located below the guide plate (48) is installed on the operating table (1). The piston rod of the return cylinder (49) is fixed with a return plate (410) located in the return port (411).

2. The testing device for friction materials according to claim 1, characterized in that: The pressing part includes a frame plate (42) fixed on the upright (41), a belt-type screw device (43) is installed on the frame plate (42), and a lifting plate (44) is slidably connected to the guide column of the frame plate (42) and fixed to the nut end of the belt-type screw device (43). Multiple lifting columns (45) that pass through the upright (41) are fixed to the bottom of the lifting plate (44), and the pressing block (46) is connected to the lifting columns (45).

3. The testing device for friction materials according to claim 1, characterized in that: The visual inspection mechanism (5) includes a support platform (510) fixed on the operating table (1), a pair of hinge plates (51), a pair of adjustment plates (52), and a drive motor (511) located below the support platform (510). The drive end of the drive motor (511) passes through the support platform (510) and is fixed to a second support platform (512). An adjustment rod (54) is hinged to one side of each of the two hinge plates (51). A waist hole (53) is provided on the adjustment plate (52). The adjustment rod (54) is fixed to the adjustment plate (52) by passing through the waist hole (53) with screws. Two sets of locking parts are provided on the outside of the adjustment rod (54). A positioning reference plate (59) and a visual inspection camera (58) are fixed on the two sets of locking parts respectively.

4. The testing device for friction materials according to claim 3, characterized in that: The locking part includes multiple locking blocks (55) locked on the adjusting rod (54), with a total of three locking blocks (55). A vertical rod (56) is also locked on the locking block (55). The positioning reference plate (59) is connected to two vertical rods (56) of equal height. A mounting plate (57) is fixed on another vertical rod (56). The visual inspection camera (58) is fixed on the mounting plate (57).

5. The testing device for friction materials according to claim 1, characterized in that: The cone depth detection mechanism (6) includes a detection frame (61) and a support platform (62) fixed on the operating table (1). A double-acting cylinder (63) is installed on the top of the detection frame (61). A detection block (68) that is perpendicular and symmetrical to the support platform (62) is fixed at the bottom end of the piston rod of the double-acting cylinder (63). A plate (64) is fixed on the top of the double-acting cylinder (63). A limit plate (65) is fixed through the piston rod of the double-acting cylinder (63) and the plate (64). A guide rod (66) that passes through the plate (64) is fixed at the bottom of the limit plate (65).

6. The testing device for friction materials according to claim 5, characterized in that: The testing frame (61) is also equipped with multiple bottom-mounted cylinders (69) and multiple guide rods (67) passing through it. The piston rods of the multiple bottom-mounted cylinders (69) are fixed with ring blocks (610) that are fixed with the guide rods (67). The testing block (68) can pass through the ring block (610). The ring block (610) is located above the support platform (62).

7. The testing device for friction materials according to claim 6, characterized in that: The top of the support platform (62) has an upwardly extending wide side, on which three narrow sides are formed.

8. The testing device for friction materials according to claim 1, characterized in that: The operating table (1) is also equipped with a cleaning mechanism (7); the cleaning mechanism (7) includes a cleaning frame (71) and a lower cylinder (75) fixed on the operating table (1). A receiving cylinder (77) is fixed on the inner side of the lower cylinder (75). A push cylinder (72) and multiple push rods (73) are installed on the top of the cleaning frame (71). The piston rod of the push cylinder (72) is fixed with an upper cylinder (74) connected to the push rods (73). The upper cylinder (74) is perpendicular and symmetrical to the lower cylinder (75). An air duct (76) is also installed on the inner side of the upper cylinder (74).

9. The testing device for friction materials according to claim 8, characterized in that: The bottom of the receiving tube (77) is a cross plate, the four ends of the cross plate extend upward to form a tube body, and the top of the tube body has three convex edges.

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