Grain elevator with wear-resistant hopper and breakage prevention device

Abstract

This invention discloses a grain elevator with a wear-resistant hopper and an anti-breakage device, belonging to the technical field of grain elevators. It includes a base, a support plate fixedly connected to the upper side of the base, a shell fixedly connected to the outer side of the support plate, a rotating rod rotatably connected to the inner side of the shell, a control roller fixedly connected to the outer side of the rotating rod, a chain disposed on the outer side of the control roller, multiple branch plates fixedly connected to the outer side of the chain, and a wear-resistant conveying hopper fixedly connected to the outer side of the branch plates. This grain elevator, with its shell, chain, branch plates, and wear-resistant conveying hopper, facilitates the lifting and conveying of grain. Through buffer plates, a first rotating block, a screw, gears, and two toothed plates, it allows for convenient control of the two buffer plates during conveying, facilitating buffering of the grain during discharge, slowing down the falling speed of the grain, and preventing breakage.

Description

Technical Field

[0001] This invention relates to the field of grain elevator technology, specifically a grain elevator with a wear-resistant hopper and an anti-breakage device. Background Technology

[0002] A grain elevator is a stationary mechanical device specifically designed to continuously and vertically (or at a steep angle) transport bulk grains (such as wheat, corn, and rice) from a low position to a high position. It is a key piece of equipment in grain storage, processing, and transportation.

[0003] A search revealed a Chinese patent with application number "CN202511879645.1", which specifically describes a grain hoist, including a frame and a chain conveyor mounted on the frame, as well as a plurality of hoppers arranged sequentially along the conveying path of the chain conveyor. The conveying path of the chain conveyor is sequentially divided into a material intake section, a conveying section, a discharge section, and a rotation section. Each hopper includes a first hopper body and a second hopper body that are inserted into each other. A receiving cavity is formed between the inner bottom wall of the first hopper body and the outer bottom wall of the second hopper body. The second hopper body is provided with a through hole communicating with the receiving cavity, and a movable closure is provided on the outer bottom wall of the second hopper body.

[0004] Bucket elevators are currently the main equipment for vertical grain conveying in grain silos. They utilize traction components encircling the head and tail wheels to drive a series of buckets, scooping up grain from the bottom and lifting it to the top for ejection, thus completing the vertical transport of grain. However, in actual use, this equipment generally suffers from a high grain breakage rate. When grain is discharged from the buckets and falls into the next process or storage facility, it is usually thrown out at a high speed, resulting in violent collisions between grains and between grains and the inner walls of the machine casing and pipes, causing the grains to crack or even pulverize. This problem not only directly reduces the quality and grade of the finished grain but also affects the ventilation effect in subsequent drying and storage stages due to increased debris, increasing the risk of mold growth and causing serious economic losses.

[0005] Therefore, the present invention proposes a grain hoist with a wear-resistant hopper and an anti-breakage device to solve the above-mentioned problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a grain elevator with a wear-resistant hopper and an anti-breakage device, which solves the problem of grain easily breaking during discharge.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A grain elevator with a wear-resistant hopper and an anti-breakage device includes a base, a support plate fixedly connected to the upper side of the base, a housing fixedly connected to the outer side of the support plate, a rotating rod rotatably connected to the inner side of the housing, a control roller fixedly connected to the outer side of the rotating rod, a chain disposed on the outer side of the control roller, multiple branch plates fixedly connected to the outer side of the chain, a wear-resistant conveying hopper fixedly connected to the outer side of the branch plates, a buffer unit disposed on the outer side of the wear-resistant conveying hopper, a feed hopper fixedly connected to the left side of the housing, a discharge frame fixedly connected to the right side of the housing, and the buffer unit for buffering the discharge of grain.

[0008] Preferably, the buffer unit includes two sets of rotating blocks, which are arranged on the front and rear sides of the wear-resistant conveying bucket. A buffer plate is fixedly connected to the outer side of the rotating block. Two side blocks are fixedly connected to both the front and rear sides of the wear-resistant conveying bucket. A control rod is rotatably connected between the two side blocks. The control rod is fixedly connected to the rotating block. The buffer plate is made of rubber material.

[0009] Preferably, a stabilizing plate is fixedly connected to both the front and rear sides of the wear-resistant conveying bucket. A sliding groove is provided on the outer side of the stabilizing plate. A slider is slidably connected to the inner side of the sliding groove. A rotating block is fixedly connected to the upper side of the slider. An inclined plate is rotatably connected to the outer side of the rotating block. A rotating plate is fixedly connected to the middle of the control rod. The rotating plate is rotatably connected to the inclined plate. A base plate is fixedly connected to the lower side of the slider. A control plate is fixedly connected to the lower side of the base plate.

[0010] Preferably, the wear-resistant conveying bucket has two bottom blocks fixedly connected to its lower side, a guide plate fixedly connected to the lower side of the bottom blocks, a second sliding groove opened on the outer side of the guide plate, a second slider slidably connected to the inner side of the second sliding groove, a moving block fixedly connected to the upper side of the second slider, an inclined plate rotatably connected to the outer side of the moving block, and the inclined plate rotatably connected to the control plate.

[0011] Preferably, a screw is rotatably connected between the two base blocks, the screw is threadedly connected to the movable block, a gear is fixedly connected to the outer end of the screw, a branch block one and a branch block two are fixedly connected to the inner side of the outer shell, a toothed plate one is fixedly connected to the rear side of the branch block one, a toothed plate two is fixedly connected to the rear side of the branch block two, the toothed plate two is located to the left of the toothed plate one, and the gears are meshed with both the toothed plate one and the toothed plate two.

[0012] Preferably, a first guide plate and a second guide plate are fixedly connected to the inner side of the outer shell, the first guide plate is connected to the feed hopper, the second guide plate is connected to the discharge frame, and a first motor is fixedly connected to the outer side of the outer shell.

[0013] Preferably, a discharge unit is provided on the outer side of the discharge frame. The discharge unit includes two fixed plates, which are fixedly connected to the inner side of the discharge frame. A lifting groove is provided on the outer side of the fixed plate. A lifting block is slidably connected to the inner side of the lifting groove. An installation plate is fixedly connected to the outer side of the lifting block. Two side plates are fixedly connected to the outer side of the installation plate. Multiple fixed pipes are fixedly connected between the two side plates. Multiple suction pipes are fixedly connected to the outer side of the fixed pipes. A connecting pipe is fixedly connected to the upper side of the fixed pipes. A vacuum cleaner is fixedly connected to the upper side of the discharge frame. A conveying pipe is fixedly connected between the vacuum cleaner and the connecting pipe.

[0014] Preferably, a lifting plate is fixedly connected to the upper side of the lifting block, a top plate is fixedly connected to the upper side of the lifting plate, two fixing blocks are fixedly connected to the upper side of the discharge frame, a connecting rod is fixedly connected between the two fixing blocks, a cam is fixedly connected to the middle of the connecting rod, and a second motor for driving the connecting rod to rotate is fixedly connected to the outer side of the fixing block.

[0015] This invention provides a grain elevator for grain silos with a wear-resistant hopper and an anti-breakage device. Compared with the prior art, it has the following advantages: (1) The grain elevator is equipped with a shell, chain, branch plate and wear-resistant conveying bucket to facilitate the lifting and conveying of grain. It is also equipped with a buffer plate, a rotating block, a screw, a gear, a toothed plate and a toothed plate to facilitate the conveying of the wear-resistant conveying bucket. The two buffer plates are controlled to facilitate the buffering of the grain during discharge, slow down the speed of the grain falling and avoid the grain breaking.

[0016] (2) The grain elevator of the grain warehouse is equipped with a discharge frame, a fixed pipe, a dust suction pipe and a dust collector. When discharging the material, multiple dust suction pipes absorb the dust generated during the discharge and control the motor to drive the top plate to move up and down, which facilitates the control of the dust suction pipe movement and further improves the dust suction range. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a partial three-dimensional structural diagram of the present invention; Figure 4 This is a three-dimensional structural diagram of the chain in this invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view of point B in the middle; Figure 7 This is a three-dimensional structural diagram of the buffer unit in this invention; Figure 8 for Figure 7 Enlarged view of point C in the middle; Figure 9 This is a three-dimensional structural diagram of the buffer unit in this invention from another perspective; Figure 10 for Figure 9 Enlarged view at point D; Figure 11 This is a three-dimensional structural diagram of the discharge unit in this invention; Figure 12 This is a three-dimensional structural diagram of the discharge unit in this invention from another perspective.

[0018] In the diagram: 1. Base; 2. Support plate; 3. Outer shell; 4. Feed hopper; 5. Discharge frame; 6. Discharge unit; 7. Motor 1; 8. Buffer unit; 9. Guide plate 1; 10. Guide plate 2; 11. Rotating rod; 12. Control roller; 13. Chain; 14. Branch plate; 15. Wear-resistant conveyor hopper; 61. Vacuum cleaner; 62. Fixing block; 63. Connecting rod; 64. Cam; 65. Motor 2; 66. Fixing plate; 67. Lifting groove; 68. Lifting block; 69. Lifting plate; 610. Top plate; 611. Mounting plate; 612. Side plate; 613. Fixing pipe; 614. 615. Suction pipe; 616. Connecting pipe; 81. Conveying pipe; 82. Branch block one; 83. Toothed plate one; 84. Branch block two; 85. Toothed plate two; 86. Buffer plate; 87. Rotating block one; 88. Side block; 89. Control rod; 810. Rotating plate one; 811. Stabilizing plate; 812. Slide groove one; 813. Sliding block one; 814. Rotating block two; 815. Base plate; 816. Control plate; 817. Base block; 818. Guide plate; 819. Slide groove two; 820. Sliding block two; 821. Moving block; 822. Sliding plate two; 823. Screw; 824. Gear. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides the following technical solutions: Example 1

[0021] Please see Figure 1 - Figure 10A grain hoist with a wear-resistant hopper and an anti-breakage device includes a base 1, a support plate 2 fixedly connected to the upper side of the base 1, a housing 3 fixedly connected to the outer side of the support plate 2, a rotating rod 11 rotatably connected to the inner side of the housing 3, a control roller 12 fixedly connected to the outer side of the rotating rod 11, a chain 13 arranged on the outer side of the control roller 12, multiple branch plates 14 fixedly connected to the outer side of the chain 13, a wear-resistant conveying bucket 15 fixedly connected to the outer side of the branch plates 14, a buffer unit 8 arranged on the outer side of the wear-resistant conveying bucket 15, a feed hopper 4 fixedly connected to the left side of the housing 3, a discharge frame 5 fixedly connected to the right side of the housing 3, the buffer unit 8 being used for buffering the discharge of grain, and a guide plate 9 fixedly connected to the inner side of the housing 3. Material plate 2 10 and guide plate 1 10 are connected to feed hopper 4 and feed hopper 2 9 are connected to discharge frame 5. Motor 1 7 is fixedly connected to the outside of housing 3. When conveying grain, motor 1 7 is started. Motor 1 7 drives rotating rod 11 to rotate. Rotating rod 11 drives control roller 12 to rotate. Control roller 12 drives chain 13 to convey. Chain 13 drives branch plate 14 to rotate and convey. Branch plate 14 drives wear-resistant conveying bucket 15 to rotate and guides grain into wear-resistant conveying bucket 15 through feed hopper 4. Then, guide plate 2 10 guides grain into discharge frame 5, which facilitates the lifting and conveying of grain.

[0022] The buffer unit 8 includes two sets of rotating blocks 86, which are arranged on the front and rear sides of the wear-resistant conveying bucket 15. A buffer plate 85 is fixedly connected to the outer side of each rotating block 86. Two side blocks 87 are fixedly connected to both the front and rear sides of the wear-resistant conveying bucket 15. A control rod 88 is rotatably connected between the two side blocks 87, and the control rod 88 is fixedly connected to the rotating block 86. The buffer plate 85 is made of rubber. A stabilizing plate 8 is fixedly connected to both the front and rear sides of the wear-resistant conveying bucket 15. 11. A sliding groove 812 is provided on the outer side of the stabilizing plate 811. A slider 813 is slidably connected to the inner side of the sliding groove 812. A rotating block 814 is fixedly connected to the upper side of the slider 813. An inclined plate 810 is rotatably connected to the outer side of the rotating block 814. A rotating plate 89 is fixedly connected to the middle of the control rod 88. The rotating plate 89 is rotatably connected to the inclined plate 810. A base plate 815 is fixedly connected to the lower side of the slider 813. A control rod 810 is fixedly connected to the lower side of the base plate 815. The lower side of the wear-resistant conveyor bucket 15 is fixedly connected to the plate 816 and two bottom blocks 817. A guide plate 818 is fixedly connected to the lower side of each bottom block 817. A second sliding groove 819 is formed on the outer side of the guide plate 818. A second slider 820 is slidably connected to the inner side of the second sliding groove 819. A moving block 821 is fixedly connected to the upper side of the second slider 820. An inclined plate 822 is rotatably connected to the outer side of the moving block 821. The inclined plate 822 is rotatably connected to the control plate 816. The two bottom blocks 817... A screw 823 is rotatably connected between the components. The screw 823 is threadedly connected to the movable block 821. A gear 824 is fixedly connected to the outer end of the screw 823. A branch block 1 81 and a branch block 2 83 are fixedly connected to the inner side of the outer casing 3. A toothed plate 1 82 is fixedly connected to the rear side of the branch block 1 81. A toothed plate 2 84 is fixedly connected to the rear side of the branch block 2 83. The toothed plate 2 84 is located to the left of the toothed plate 1 82. The gear 824 is meshed with both the toothed plate 1 82 and the toothed plate 2 84.

[0023] When the wear-resistant conveyor bucket 15 moves to the vicinity of the discharge frame 5, the wear-resistant conveyor bucket 15 drives the gear 824 to move. When the gear 824 meshes with the toothed plate 82, the chain 13 rotates, causing the gear 824 to rotate. The gear 824 drives the screw 823 to rotate, the screw 823 drives the moving block 821 to move, the moving block 821 drives the inclined plate 822 to rotate, the inclined plate 822 drives the control plate 816 to descend, the control plate 816 drives the bottom plate 815 to descend, and the bottom plate 815 drives... Slider 813 descends, causing inclined plate 810 to rotate, which in turn causes rotating plate 89 to rotate. Since inclined plate 810 and rotating plate 89 are symmetrically distributed on both sides, the control rods 88 on both sides rotate in opposite directions. Control rods 88 cause rotating block 86 to rotate, which in turn causes buffer plate 85 to rotate. Buffer plates 85 on both sides open to block the falling grain, slowing down the falling speed and preventing the grain from falling too fast and breaking. Example 2

[0024] Based on Example 1, see [link / reference] Figure 11 , Figure 12 A discharge unit 6 is provided on the outer side of the discharge frame 5. The discharge unit 6 includes two fixing plates 66, which are fixedly connected to the inner side of the discharge frame 5. A lifting groove 67 is opened on the outer side of the fixing plate 66. A lifting block 68 is slidably connected to the inner side of the lifting groove 67. An installation plate 611 is fixedly connected to the outer side of the lifting block 68. Two side plates 612 are fixedly connected to the outer side of the installation plate 611. Multiple fixing pipes 613 are fixedly connected between the two side plates 612. Multiple suction pipes 614 are fixedly connected to the outer side of the fixing pipes 613. A connecting pipe 615 is fixedly connected to the upper side of the fixing pipes 613. A vacuum cleaner 61 is fixedly connected to the upper side of the discharge frame 5. A conveying pipe 616 is fixedly connected between the vacuum cleaner 61 and the connecting pipe 615. A lifting plate 69 is fixedly connected to the upper side of the lifting block 68. A top plate 610 is fixedly connected to the upper side of the lifting plate 69. Two fixing blocks 62 are fixedly connected to the upper side, and a connecting rod 63 is fixedly connected between the two fixing blocks 62. A cam 64 is fixedly connected to the middle of the connecting rod 63. A motor 65 that drives the connecting rod 63 to rotate is fixedly connected to the outer side of the fixing blocks 62. When the material is discharged from the discharge frame 5, a lot of dust will be generated. At this time, the vacuum cleaner 61 is started. Under the action of the conveying pipe 616, the connecting pipe 615 and the fixing pipe 613, multiple suction pipes 614 absorb the dust. At the same time, the motor 65 is started. The motor 65 drives the connecting rod 63 to rotate. The connecting rod 63 drives the cam 64 to rotate. The cam 64 drives the top plate 610 to move up and down. The top plate 610 drives the lifting plate 69 to move. The lifting plate 69 drives the lifting block 68 to move. The lifting block 68 drives the mounting plate 611 to move up and down, increasing the dust collection range. The conveying pipe 616 is made of flexible hose material.

[0025] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0026] Working principle: When conveying grain, start motor 7. Motor 7 drives the rotating rod 11 to rotate. The rotating rod 11 drives the control roller 12 to rotate. The control roller 12 drives the chain 13 to convey grain. The chain 13 drives the branch plate 14 to rotate and convey grain. The branch plate 14 drives the wear-resistant conveying bucket 15 to rotate and guide the grain into the wear-resistant conveying bucket 15 through the feed hopper 4. Then, the grain is guided into the discharge frame 5 through the guide plate 10, which facilitates the lifting and conveying of the grain.

[0027] When the wear-resistant conveyor bucket 15 moves to the vicinity of the discharge frame 5, the wear-resistant conveyor bucket 15 drives the gear 824 to move. When the gear 824 meshes with the toothed plate 82, the chain 13 rotates, causing the gear 824 to rotate. The gear 824 drives the screw 823 to rotate, the screw 823 drives the moving block 821 to move, the moving block 821 drives the inclined plate 822 to rotate, the inclined plate 822 drives the control plate 816 to descend, the control plate 816 drives the bottom plate 815 to descend, and the bottom plate 815 drives... Slider 813 descends, causing inclined plate 810 to rotate, which in turn causes rotating plate 89 to rotate. Since inclined plate 810 and rotating plate 89 are symmetrically distributed on both sides, the control rods 88 on both sides rotate in opposite directions. Control rods 88 cause rotating block 86 to rotate, which in turn causes buffer plate 85 to rotate. Buffer plates 85 on both sides open to block the falling grain, slowing down the falling speed and preventing the grain from falling too fast and breaking.

[0028] 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 process, method, article, or apparatus.

[0029] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grain hoist with a wear-resistant hopper and an anti-breakage device, comprising a base (1), characterized in that: A support plate (2) is fixedly connected to the upper side of the base (1). A shell (3) is fixedly connected to the outer side of the support plate (2). A rotating rod (11) is rotatably connected to the inner side of the shell (3). A control roller (12) is fixedly connected to the outer side of the rotating rod (11). A chain (13) is provided on the outer side of the control roller (12). Multiple branch plates (14) are fixedly connected to the outer side of the chain (13). A wear-resistant conveying bucket (15) is fixedly connected to the outer side of the branch plate (14). A buffer unit (8) is provided on the outer side of the wear-resistant conveying bucket (15). A feed hopper (4) is fixedly connected to the left side of the shell (3). A discharge frame (5) is fixedly connected to the right side of the shell (3). The buffer unit (8) is used for buffering the discharge of grains.

2. The grain elevator with wear-resistant hopper and anti-breakage device according to claim 1, characterized in that: The buffer unit (8) includes two sets of rotating blocks (86). The two sets of rotating blocks (86) are arranged on the front and rear sides of the wear-resistant conveying bucket (15). A buffer plate (85) is fixedly connected to the outer side of the rotating block (86). Two side blocks (87) are fixedly connected to the front and rear sides of the wear-resistant conveying bucket (15). A control rod (88) is rotatably connected between the two side blocks (87). The control rod (88) is fixedly connected to the rotating block (86). The buffer plate (85) is made of rubber material.

3. A grain elevator with a wear-resistant hopper and an anti-breakage device as described in claim 2, characterized in that: The wear-resistant conveying bucket (15) is fixedly connected to both the front and rear sides with stabilizing plates (811). A sliding groove (812) is provided on the outer side of the stabilizing plate (811). A slider (813) is slidably connected to the inner side of the sliding groove (812). A rotating block (814) is fixedly connected to the upper side of the slider (813). An inclined plate (810) is rotatably connected to the outer side of the rotating block (814). A rotating plate (89) is fixedly connected to the middle of the control rod (88). The rotating plate (89) is rotatably connected to the inclined plate (810). A base plate (815) is fixedly connected to the lower side of the slider (813). A control plate (816) is fixedly connected to the lower side of the base plate (815).

4. A grain elevator with a wear-resistant hopper and an anti-breakage device as described in claim 3, characterized in that: The wear-resistant conveying bucket (15) has two bottom blocks (817) fixedly connected to its lower side. A guide plate (818) is fixedly connected to the lower side of the bottom block (817). A second sliding groove (819) is provided on the outer side of the guide plate (818). A second slider (820) is slidably connected to the inner side of the second sliding groove (819). A moving block (821) is fixedly connected to the upper side of the second slider (820). An inclined plate (822) is rotatably connected to the outer side of the moving block (821). The inclined plate (822) is rotatably connected to the control plate (816).

5. A grain elevator with a wear-resistant hopper and an anti-breakage device as described in claim 4, characterized in that: A screw (823) is rotatably connected between the two base blocks (817). The screw (823) is threadedly connected to the moving block (821). A gear (824) is fixedly connected to the outer end of the screw (823). A branch block one (81) and a branch block two (83) are fixedly connected to the inner side of the outer shell (3). A toothed plate one (82) is fixedly connected to the rear side of the branch block one (81). A toothed plate two (84) is fixedly connected to the rear side of the branch block two (83). The toothed plate two (84) is located to the left of the toothed plate one (82). The gear (824) is meshed with both the toothed plate one (82) and the toothed plate two (84).

6. A grain elevator with a wear-resistant hopper and an anti-breakage device as described in claim 1, characterized in that: The inner side of the outer shell (3) is fixedly connected to a guide plate one (9) and a guide plate two (10). The guide plate one (10) is connected to the feed hopper (4), and the guide plate two (9) is connected to the discharge frame (5). The outer side of the outer shell (3) is fixedly connected to a motor one (7).

7. A grain elevator with a wear-resistant hopper and an anti-breakage device as described in claim 1, characterized in that: The discharge frame (5) is provided with a discharge unit (6) on its outer side. The discharge unit (6) includes two fixing plates (66). The two fixing plates (66) are fixedly connected to the inner side of the discharge frame (5). The outer side of the fixing plate (66) is provided with a lifting groove (67). The inner side of the lifting groove (67) is slidably connected with a lifting block (68). The outer side of the lifting block (68) is fixedly connected with an installation plate (611). The outer side of the installation plate (611) is fixedly connected with two side plates (612). Multiple fixing pipes (613) are fixedly connected between the two side plates (612). Multiple vacuum pipes (614) are fixedly connected to the outer side of the fixing pipes (613). A connecting pipe (615) is fixedly connected to the upper side of the fixing pipes (613). A vacuum cleaner (61) is fixedly connected to the upper side of the discharge frame (5). A conveying pipe (616) is fixedly connected between the vacuum cleaner (61) and the connecting pipe (615).

8. A grain elevator with a wear-resistant hopper and an anti-breakage device as described in claim 7, characterized in that: A lifting plate (69) is fixedly connected to the upper side of the lifting block (68), and a top plate (610) is fixedly connected to the upper side of the lifting plate (69). Two fixing blocks (62) are fixedly connected to the upper side of the discharge frame (5). A connecting rod (63) is fixedly connected between the two fixing blocks (62). A cam (64) is fixedly connected to the middle of the connecting rod (63). A second motor (65) for driving the connecting rod (63) to rotate is fixedly connected to the outer side of the fixing block (62).

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