Automatic detection device for metal material production

Abstract

A metal material production automatic detection device disclosed by the present invention comprises a rack, one side of the rack transports a metal piece to the surface of a detection platform through a conveying belt, and one side of the rack transports the metal piece on the surface of the detection platform to the middle position of a movable disc through a pushing mechanism. A metal piece on the surface of the movable disc is pressed through a rotary pressing tool above the rack, and the size of the surface of the metal piece is detected on one side of the rack through a surface detection device; the clutch discs are arranged on the upper side and the lower side of the limiting sliding rod, the limiting sliding rod drives the clutch discs to be tightly attached to the second attaching disc and the first attaching disc through a sub-control mechanism, the first attaching disc rotates to drive the movable disc to rotate, and the second attaching disc rotates to drive the sliding trolley to transversely move at the bottom of the rack; the automatic feeding and discharging device can effectively achieve automatic control of feeding and discharging of metal workpieces, reduces output of labor force, and is low in manufacturing cost and suitable for being introduced and used by microminiature enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of hardware detection, and in particular to an automatic detection device for metal material production. Background Art

[0002] Metal materials refer to some standard parts made of metal, such as hardware. Such parts play a vital role in the development of science and technology. The production of such metal workpieces, including forging, casting, and powder alchemy, requires the size or performance testing of the finished parts, so various types of testing devices are needed.

[0003] At present, the surface appearance inspection of metal products mostly needs to rely on manual assistance, which is a waste of labor. In the process of mass production of hardware, the excessive number of products leads to a heavy burden of inspection work on the assembly line. At present, the purpose of automated inspection cannot be effectively achieved, or most automated inspection equipment requires more drive components, the introduction cost is high, and it is not suitable for the production and manufacturing of small and medium-sized enterprises.

[0004] Therefore, how to provide an automatic detection device for metal material production is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] One purpose of the present invention is to provide an automatic detection device for metal material production.

[0006] According to an embodiment of the present invention, an automatic inspection device for metal material production includes a frame, one side of the frame transports metal parts to the surface of an inspection platform through a conveyor belt, one side of the frame transports the metal parts on the surface of the inspection platform to the middle position of a movable disk through a pushing mechanism, the upper part of the frame presses the metal parts on the surface of the movable disk through a rotating press, and one side of the frame performs size inspection on the surface of the metal parts through a surface inspection device;

[0007] The clutch disks are arranged on the upper and lower sides of the limit slide bar, and the limit slide bar drives the clutch disk to be in close contact with the second bonding disk and the first bonding disk through the sub-control mechanism, and the first bonding disk rotates to drive the movable disk to rotate, and the second bonding disk rotates to drive the sliding vehicle to move horizontally at the bottom of the frame;

[0008] A pushing frame is moved laterally inside the frame by a sliding vehicle, and the pushing frame pushes the metal parts on the surface of the detection platform to move.

[0009] Furthermore, a driving motor and a transmission mechanism are provided inside the sliding vehicle, and the transmission mechanism includes a second bevel tooth and a limiting slide rod, the second bevel tooth is fixed to the outer surface of the spline sleeve, one side of the second bevel tooth is connected to the output shaft of the driving motor through the first bevel tooth, the limiting slide rod is arranged on the inner side of the spline sleeve through the spline to slide up and down, and the driving motor drives the movable disk to rotate through the clutch disk.

[0010] Furthermore, a tooth is fixedly connected to the top of the first bonding disk through a shaft rod, and one side of the tooth is engaged with an annular tooth groove, and the annular tooth groove is provided on the inner surface of the movable disk.

[0011] Furthermore, the movable disk is rotatably arranged at the center of the detection platform, and the detection platform is fixedly connected to the frame.

[0012] Furthermore, a motion component is provided at the bottom of the sliding vehicle, and the motion component includes a triple pulley assembly and two sets of transmission wheels. Three sets of pulleys are provided on the inner side of the triple pulley assembly, and a single set of pulleys is fixed to the bottom of the second bonding disk. The opposite sides of the two sets of transmission wheels are connected to a bevel gear group through a connecting rod, and the bevel gear group is fixed above the two sets of pulleys on the inner side of the triple pulley assembly.

[0013] Furthermore, the upper part of the second bonding disk is aligned with the clutch disk, the transmission wheel is arranged in the middle position of both sides of the sliding vehicle, and the two ends of the sliding vehicle close to the transmission wheel are respectively provided with blocking wheels, and the sliding vehicle moves laterally inside the frame through the transmission wheel.

[0014] Furthermore, the sub-control mechanism includes a driving frame and two groups of electromagnetic attractors, the output ends of the two groups of electromagnetic attractors are respectively fixed on both sides of the driving frame, the electromagnetic attractors are fixedly connected to the sliding vehicle, and the electromagnetic attractors enable the driving frame to move up and down inside the sliding vehicle.

[0015] Furthermore, the middle position of the driving frame is movably connected to the lower part of the limiting slide bar through a bearing, and the movement of the driving frame drives the limiting slide bar to move up and down inside the spline sliding sleeve.

[0016] Furthermore, the pushing mechanism includes a pushing frame and a movable bracket sleeve. One side of the pushing frame is fixed to the top of the movable telescopic rod by a connecting slide rod. The bottom of the movable telescopic rod is elastically connected to the top of the movable bracket sleeve by a spring sleeve. The movable bracket sleeve is fixedly connected to the sliding vehicle by a connecting rod.

[0017] Furthermore, a sliding wedge groove is horizontally opened at a position of the push frame connecting slide rod on one side of the frame, the sliding wedge groove protrudes upward at a position close to the conveyor belt on one side of the frame, and a sliding groove is opened at a position close to the movable bracket sleeve connecting rod on one side of the frame.

[0018] The beneficial effects of the present invention are:

[0019] The present invention arranges a transmission mechanism on the output shaft of the driving motor, and the limit slide bar moves up and down under the control of the sub-control mechanism, so that the clutch disc is docked with the second bonding disc or the first bonding disc, thereby realizing different transmission directions. In this way, the movement of the sliding vehicle inside the frame can be realized first, and then the detection work can be assisted. The number of driving motors required is small, the manufacturing cost is low, and the automation capability is outstanding.

[0020] The present invention can drive the push frame to move synchronously when the sliding vehicle moves through the push mechanism, and change the height of the push frame at a specified position under the restricted movement of the sliding wedge groove, so as to cooperate with the conveyor belt on one side of the frame to effectively drive the workpiece to move to the detection area on the surface of the movable disk for detection, and realize automatic loading and unloading operations throughout the process, which is suitable for detection on the assembly line and does not rely on manual operation.

[0021] The present invention sets up a movable disk. After the workpiece moves to the surface of the movable disk, the lower part of the movable disk can engage with the teeth through the annular tooth groove. In this way, the teeth rotate after being affected by the rotation effect of the first bonding disk, thereby driving the workpiece to rotate, so as to cooperate with the surface detection device in the telescopic state to perform detection work, thereby reducing the requirements for the detection range of the surface detection device, and is suitable for the detection of special-shaped metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of an automatic detection device for metal material production proposed by the present invention;

[0024] Figure 2 This is a half-section schematic diagram of the overall structure of an automatic detection device for metal material production proposed by the present invention.

[0025] Figure 3 This is a schematic diagram of the sliding car connection structure of an automatic detection device for metal material production proposed by the present invention.

[0026] Figure 4 This is a schematic diagram of the connection of a driving motor for an automatic detection device for metal material production proposed by the present invention.

[0027] Figure 5 This is a schematic diagram of the half-section structure of a sliding car of an automatic inspection device for metal material production proposed by the present invention.

[0028] Figure 6This is a schematic diagram of the disassembly of the transmission mechanism of the automatic detection device for metal material production proposed by the present invention.

[0029] Figure 7 The invention proposes an automatic detection device for metal material production Figure 2 Enlarged schematic diagram of the structure at point A.

[0030] Figure 8 The invention proposes an automatic detection device for metal material production Figure 6 Enlarged schematic diagram of the structure at point B.

[0031] In the figure: 1, frame; 2, detection platform; 3, movable plate; 4, surface detection device; 5, sliding car; 6, driving motor; 7, transmission mechanism; 8, sub-control mechanism; 9, driving mechanism;

[0032] 71. First bevel gear; 72. Second bevel gear; 73. Spline sleeve; 74. Limiting slide rod; 75. Clutch disc; 76. Moving assembly; 77. First bonding disc; 78. Gear; 79. Annular tooth groove; 81. Driving frame; 82. Electromagnetic absorber; 91. Pushing frame; 92. Movable telescopic rod; 93. Movable bracket sleeve; 94. Sliding wedge groove; 761. Triple pulley assembly; 762. Second bonding disc; 763. Bevel gear group; 764. Transmission wheel. DETAILED DESCRIPTION

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0034] refer to Figure 1 and Figure 2 , including a frame 1, one side of the frame 1 transports the metal parts to the surface of the detection platform 2 through a conveyor belt, one side of the frame 1 transports the metal parts on the surface of the detection platform 2 to the middle position of the movable disk 3 through a pushing mechanism 9, the metal parts on the surface of the movable disk 3 are pressed by a rotating press above the frame 1, and the surface of the metal parts is dimensionally inspected by a surface inspection device 4 on one side of the frame 1; a clutch disk 75 is arranged on the upper and lower sides of the limit slide 74, and the limit slide 74 drives the clutch disk 75 to be in close contact with the second bonding disk 762 and the first bonding disk 77 through a sub-control mechanism 8, the first bonding disk 77 rotates to drive the movable disk 3 to rotate, and the second bonding disk 762 rotates to drive the sliding car 5 to move horizontally at the bottom of the frame 1; a pushing frame 91, the pushing frame 91 moves horizontally inside the frame 1 through the sliding car 5, and the pushing frame 91 drives the metal parts on the surface of the detection platform 2 to move.

[0035] In this embodiment, after the metal workpiece moves from the conveyor belt on one side of the frame 1 to the surface of the detection platform 2, it is driven by the drive motor 6 to drive the sliding vehicle 5 to move and at the same time drive the pushing mechanism 9 to move. The pushing frame 91 in the pushing mechanism 9 can effectively drive the metal workpiece on the surface of the detection platform 2 to move to the middle position of the movable disk 3, and then the rotary press above the frame 1 moves down to clamp and press the workpiece (the rotary press belongs to a type of clamping device in the prior art that can realize the downward pressing operation and rotate with the workpiece), and then under the control of the sub-control mechanism 8, the position of the limit slide bar 74 is moved up, thereby changing the transmission direction of the drive motor 6. In this way, the drive motor 6 no longer drives the sliding vehicle 5 to move, but instead drives the movable disk 3 to rotate, thereby realizing the rotation effect of the workpiece. In this way, the surface detection device 4 in the telescopic state can effectively detect the surface size value of the workpiece and understand the degree of qualification of the workpiece.

[0036] refer to Figure 4 and Figure 5 A driving motor 6 and a transmission mechanism 7 are arranged inside the sliding vehicle 5. The transmission mechanism 7 includes a second bevel tooth 72 and a limiting slide bar 74. The second bevel tooth 72 is fixed to the outer surface of the spline sleeve 73. One side of the second bevel tooth 72 is connected to the output shaft of the driving motor 6 through the first bevel tooth 71. The limiting slide bar 74 is arranged on the inner side of the spline sleeve 73 through the spline to slide up and down. The driving motor 6 drives the movable disk 3 to rotate through the clutch disk 75.

[0037] The first bevel gear 71 is driven by the internal drive motor 6 of the sliding vehicle 5, and the meshing effect of the first bevel gear 71 and the second bevel gear 72 realizes the rotation of the second bevel gear 72. The spline sleeve 73 rotates in coordination at this time, and the limit slide bar 74 is driven to rotate at the same time under the connection of the spline and the flower groove, so as to realize the basic transmission effect. The clutch plate 75 connected to the upper and lower limit slide bar 74 can realize the transmission effect after being tightly attached to the second contact plate 762 or the first contact plate 77, thereby driving the first contact plate 77 or the second contact plate 762 to rotate, thereby changing the actual transmission direction.

[0038] refer to Figure 5 The first bonding disk 77 is fixedly connected to the tooth 78 through the shaft, and one side of the tooth 78 is engaged with the annular tooth groove 79, which is provided on the inner surface of the movable disk 3. The movable disk 3 is rotatably arranged at the center of the detection platform 2, and the detection platform 2 is fixedly connected to the frame 1.

[0039] In this embodiment, the first bonding disk 77 rotates and drives the teeth 78 to rotate through the shaft, and the teeth 78 are meshed with the inner side of the annular tooth groove 79, so that the annular tooth groove 79 can be driven by force to drive the movable disk 3 to rotate inside the detection platform 2, thereby driving the workpiece to rotate, thereby realizing the detection work;

[0040] refer to Figure 4, Figure 6 and Figure 8 The bottom of the sliding carriage 5 is provided with a motion assembly 76, which includes a triple pulley assembly 761 and two sets of transmission wheels 764. The inner side of the triple pulley assembly 761 is provided with three sets of pulleys, and a single set of pulleys is fixed to the lower side of the second bonding disk 762. The opposite sides of the two sets of transmission wheels 764 are connected to a bevel gear set 763 through a connecting rod, and the bevel gear set 763 is fixed above the two sets of pulleys inside the triple pulley assembly 761. The upper side of the second bonding disk 762 is aligned with the clutch disk 75, and the transmission wheels 764 are arranged in the middle of the two sides of the sliding carriage 5. The two ends of the sliding carriage 5 close to the transmission wheels 764 are respectively provided with blocking wheels, and the sliding carriage 5 moves laterally inside the frame 1 through the transmission wheels 764.

[0041] In this embodiment, the second bonding disk 762 is aligned with the clutch disk 75 below the limiting slide bar 74, so that when the clutch disk 75 is docked with the second bonding disk 762, the transmission effect of the drive motor 6 can directly drive the second bonding disk 762 to rotate, and the triple pulley assembly 761 is connected below the second bonding disk 762, so that the pulleys on the other two sides of the triple pulley assembly 761 rotate, and the reversing of the bevel gear group 763 is used to drive the transmission wheel 764 to rotate, and the transmission wheel 764 is arranged on the outside of the sliding vehicle 5, so that the sliding vehicle 5 and the frame 1 can be driven by the rotation effect of the transmission wheel 764 to move, thereby changing the position of the pushing mechanism 9, and the number of drive motors 6 required as a whole is only one group, which greatly reduces the manufacturing cost.

[0042] refer to Figure 6 and Figure 8 The sub-control mechanism 8 includes a driving frame 81 and two sets of electromagnetic attractors 82. The output ends of the two sets of electromagnetic attractors 82 are respectively fixed on both sides of the driving frame 81. The electromagnetic attractors 82 are fixedly connected to the sliding vehicle 5. The electromagnetic attractors 82 enable the driving frame 81 to move up and down inside the sliding vehicle 5. The middle position of the driving frame 81 is movably connected to the lower part of the limit slide bar 74 through a bearing. The driving frame 81 moves and drives the limit slide bar 74 to move up and down inside the spline sliding sleeve 73.

[0043] In this embodiment, the electromagnetic absorbers 82 on both sides of the driving frame 81 can pull the driving frame 81 up or down after being driven, thereby realizing the docking operation of the clutch disks 75 on the upper and lower sides of the limit slide bar 74. In actual use, control devices such as proximity switches can be set between the sliding vehicle 5 and the frame 1 to control the drive of the electromagnetic absorber 82 under specified circumstances, so as to achieve the purpose of automatic control.

[0044] refer to Figure 5 and Figure 7The pushing mechanism 9 includes a pushing frame 91 and a movable bracket sleeve 93. One side of the pushing frame 91 is fixed to the upper part of the movable telescopic rod 92 through a connecting slide rod. The lower part of the movable telescopic rod 92 is elastically connected to the upper part of the movable bracket sleeve 93 through a spring sleeve. The movable bracket sleeve 93 is fixedly connected to the sliding vehicle 5 through a connecting rod. A sliding wedge groove 94 is horizontally opened at a position of the pushing frame 91 connecting slide rod on one side of the frame 1. The sliding wedge groove 94 protrudes upward near the position of the conveyor belt on one side of the frame 1. A sliding groove is opened at a position of the connecting rod of the movable bracket sleeve 93 on one side of the frame 1.

[0045] In the present embodiment, one side of the pushing frame 91 is elastically connected to the movable support sleeve 93 through a movable telescopic rod 92, and the lower part of the movable support sleeve 93 is directly fixed to one side of the sliding vehicle 5, and the whole is in a C shape, so that the pushing frame 91 can be synchronously driven to move during the movement of the sliding vehicle 5, and the moving height position of the pushing frame 91 is limited by the sliding wedge groove 94. In this way, it is only necessary to set the sliding wedge groove 94 at the specified position so that the pushing frame 91 is forced to move upward at the specified position, so that the pushing frame 91 and the workpiece are not in the same plane, thereby completing the conveying work of the coordinated conveyor belt.

[0046] Working principle: First, the produced metal parts are conveyed to the surface of the inspection platform 2 on the conveyor belt on one side of the frame 1, and then the electromagnetic suction device 82 in the sub-control mechanism 8 inside the sliding car 5 is driven to drive the frame 81 to descend, so that the limit slide bar 74 in the synchronous driving transmission mechanism 7 moves downward on the inner side of the spline sleeve 73, so that the clutch plate 75 under the limit slide bar 74 is in close contact with the second contact plate 762 in the moving component 76, so that when the driving motor 6 is driven, the meshing of the first bevel gear 71 and the second bevel gear 72 The transmission effect directly drives the limited sliding rod 74 to rotate through the spline sliding sleeve 73. After the second bonding disk 762 is rotated under the force, it can drive the triple pulley assembly 761 to operate. The two sides of the triple pulley assembly 761 drive the transmission wheels 764 on both sides of the sliding vehicle 5 to rotate through the bevel gear group 763. At this time, the sliding vehicle 5 moves inside the frame 1, and synchronously drives the movable bracket sleeve 93 in the pushing mechanism 9 to move. The movable bracket sleeve 93 is elastically connected to the pushing frame 91 through the movable telescopic rod 92, and the pushing frame 91 is driven to move. The displacement above the detection platform 2 drives the workpiece to move to the middle of the movable disk 3. Otherwise, it rises under the restriction of the sliding wedge groove 94 to prevent affecting the normal supply operation of the workpiece. Subsequently, the workpiece is clamped by the rotating clamping device above the frame 1. At this time, the electromagnetic suction device 82 pulls the driving frame 81 in the opposite direction to achieve the separation of the clutch disk 75 and the second bonding disk 762. At the same time, the clutch disk 75 above the limiting slide bar 74 docks with the first bonding disk 77. Subsequently, the first bonding disk 77 rotates to drive the meshing teeth 78 to rotate. The meshing effect of the meshing teeth 78 and the annular tooth groove 79 realizes the overall rotation of the movable disk 3. At this time, the workpiece rotates to cooperate with the surface detection device 4 in the telescopic state to achieve a better detection purpose. Finally, after the detection is completed, the various components are reset, and the sliding car 5 continues to be driven by the driving motor 6 to move. The pushing frame 91 now pushes the workpiece to move to the conveyor belt or the discharging position on the other side of the frame 1, and reciprocates to achieve the purpose of automated detection. The overall does not rely on manpower, and has a simple structure and low manufacturing cost, which is suitable for the introduction of micro and small enterprises.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic detection device for metal material production, characterized in that: The machine comprises a frame (1), wherein one side of the frame (1) transports metal parts to the surface of a detection platform (2) via a conveyor belt, and one side of the frame (1) transports the metal parts on the surface of the detection platform (2) to the middle position of a movable disk (3) via a pushing mechanism (9), and the upper part of the frame (1) presses the metal parts on the surface of the movable disk (3) via a rotating pressing tool, and one side of the frame (1) performs dimensional detection on the surface of the metal parts via a surface detection device (4); A clutch disk (75) is arranged on the upper and lower sides of the limit slide bar (74), and the limit slide bar (74) drives the clutch disk (75) to be in close contact with the second contact disk (762) and the first contact disk (77) through a sub-control mechanism (8); the first contact disk (77) rotates to drive the movable disk (3) to rotate, and the second contact disk (762) rotates to drive the sliding vehicle (5) to move horizontally at the bottom of the frame (1); A pushing frame (91) is moved transversely inside the frame (1) via a sliding vehicle (5), and the pushing frame (91) pushes the metal parts on the surface of the detection platform (2) to move.

2. The automatic detection device for metal material production according to claim 1, characterized in that: A driving motor (6) and a transmission mechanism (7) are arranged inside the sliding vehicle (5). The transmission mechanism (7) comprises a second bevel tooth (72) and a limiting slide bar (74). The second bevel tooth (72) is fixed on the outer surface of the spline sleeve (73). One side of the second bevel tooth (72) is connected to the output shaft of the driving motor (6) through the first bevel tooth (71). The limiting slide bar (74) is arranged on the inner side of the spline sleeve (73) through the spline to slide up and down. The driving motor (6) drives the movable disk (3) to rotate through the clutch disk (75).

3. The automatic detection device for metal material production according to claim 1 is characterized in that: The first bonding disk (77) is fixedly connected to a tooth (78) via a shaft rod, and one side of the tooth (78) is meshed with an annular tooth groove (79) which is provided on the inner surface of the movable disk (3).

4. The automatic detection device for metal material production according to claim 3 is characterized in that: The movable disk (3) is rotatably arranged at the center of the detection platform (2), and the detection platform (2) is fixedly connected to the frame (1).

5. The automatic detection device for metal material production according to claim 1, characterized in that: A motion assembly (76) is provided at the bottom of the sliding vehicle (5), and the motion assembly (76) includes a triple pulley assembly (761) and two sets of transmission wheels (764). Three sets of pulleys are sleeved on the inner side of the triple pulley assembly (761), and a single set of pulleys is fixed to the bottom of the second bonding disk (762). The opposite sides of the two sets of transmission wheels (764) are connected to a bevel gear set (763) through a connecting rod, and the bevel gear set (763) is fixedly arranged above the two sets of pulleys on the inner side of the triple pulley assembly (761).

6. The automatic detection device for metal material production according to claim 5, characterized in that: The upper portion of the second bonding disk (762) is aligned with the clutch disk (75), the transmission wheel (764) is arranged at the middle position of both sides of the sliding vehicle (5), and the two ends of the sliding vehicle (5) close to the transmission wheel (764) are respectively provided with blocking wheels, and the sliding vehicle (5) moves laterally inside the frame (1) through the transmission wheel (764).

7. The automatic detection device for metal material production according to claim 1, characterized in that: The sub-control mechanism (8) comprises a driving frame (81) and two groups of electromagnetic attractors (82), the output ends of the two groups of electromagnetic attractors (82) are respectively fixed on both sides of the driving frame (81), the electromagnetic attractors (82) are fixedly connected to the sliding vehicle (5), and the electromagnetic attractors (82) enable the driving frame (81) to move up and down inside the sliding vehicle (5).

8. The automatic detection device for metal material production according to claim 7, characterized in that: The middle position of the driving frame (81) is movably connected to the lower part of the limiting slide bar (74) through a bearing, and the driving frame (81) moves to drive the limiting slide bar (74) to move up and down inside the spline sliding sleeve (73).

9. The automatic detection device for metal material production according to claim 1, characterized in that: The pushing mechanism (9) comprises a pushing frame (91) and a movable bracket sleeve (93); one side of the pushing frame (91) is fixed to the top of a movable telescopic rod (92) via a connecting slide rod; the bottom of the movable telescopic rod (92) is elastically connected to the top of the movable bracket sleeve (93) via a spring sleeve; and the movable bracket sleeve (93) is fixedly connected to the sliding vehicle (5) via a connecting rod.

10. The automatic detection device for metal material production according to claim 9, characterized in that: A sliding wedge groove (94) is transversely provided on one side of the frame (1) near the position where the push frame (91) is connected to the sliding rod. The sliding wedge groove (94) protrudes upward near the position of the conveyor belt on one side of the frame (1). A sliding groove is provided on one side of the frame (1) near the position of the connecting rod of the movable bracket sleeve (93).

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