Arrow test loading device

Abstract

The utility model discloses a loading device for arrow support test relates to arrow support test technical field, including base, discharging tank, guide block, the one end of guide block near discharging tank is provided with arrow straightness detector, arrow straightness detector and base fixed connection, be provided with the conveying mechanism who is used for carrying out equidistance conveying one by one to arrow support on the base. The utility model discloses a conveying mechanism, can accurate complete the orderly delivery of arrow support on the conveying path, avoid multiple arrow support stacking congestion, ensure the coherence and stability of loading process, to realize the purpose of equidistance conveying one by one to multiple arrow support, through the accomodation and discharge of single arrow support simultaneously, can complete equidistance conveying one by one without additional driving source, simplifies the equipment structure and reduced energy consumption to the further improvement of the efficiency of arrow support detection, effectively improves the accuracy and reliability of arrow support detection result.

Description

Technical Field

[0001] This utility model relates to the field of arrow testing technology, specifically to a feeding device for arrow testing. Background Technology

[0002] During the production of arrows, it is necessary to test them to ensure their performance (such as flight stability, range accuracy, arrowhead penetration, etc.), quality (inspecting for defects such as arrow shaft cracks and arrow tail joint firmness to ensure consistency), and safety (avoiding dangers such as breakage and component detachment during launch).

[0003] Traditionally, performance testing of arrows (such as flight stability) is carried out manually, with each arrow placed onto the testing equipment one by one. This process is inefficient and cannot meet the testing needs of a large number of arrows. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the existing technology by providing a feeding device for arrow testing, which can ensure the continuity and stability of the feeding process and avoid multiple arrows from stacking and causing congestion.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A feeding device for arrow testing includes a base, a feeding box installed at one end of the top of the base, and a guide block fixedly connected to the other end of the top of the base. The upper surface of the guide block is inclined, and the bottom of the inner wall of the feeding box is inclined. A discharge port communicating with the inner cavity of the feeding box is opened at one end of the feeding box near the guide block. An arrow shaft straightness detector is provided at one end of the guide block near the feeding box. The arrow shaft straightness detector is fixedly connected to the base. A conveying mechanism for conveying arrows one by one at equal intervals is provided on the base.

[0007] The conveying mechanism includes: a sliding push plate set inside the base, two movable push plates symmetrically fixedly connected to the top of the sliding push plate, both movable push plates extending through to the outside of the top of the base, both movable push plates being slidably connected to the base, both movable push plates being located between the guide block and the feeding box, and an arrow shaft straightness detector being located between the two movable push plates.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] In one alternative embodiment, the conveying mechanism further includes a first pushing component disposed on the base;

[0010] The first pushing component includes: a fixed baffle that is slidably connected inside the base, the fixed baffle being located at one end of the sliding push plate, and a second hydraulic push rod being installed at the end of the fixed baffle away from the sliding push plate, the output end of the second hydraulic push rod being fixedly connected to the sliding push plate;

[0011] The fixed baffle is provided with a second pushing component for pushing the sliding push plate upward;

[0012] The feed box is equipped with a discharge assembly for the individual discharge of arrows;

[0013] The base is equipped with a support component for supporting the arrow.

[0014] In one alternative embodiment: the second pushing component includes: a lifting push plate fixedly connected to one end of a fixed baffle, the lifting push plate being located below a sliding push plate, two linear guide rails being symmetrically fixedly connected to the top of the lifting push plate, the sliding push plate being slidably sleeved on the outer wall of the two linear guide rails, a fixed base plate being provided on the lower surface of the lifting push plate, the fixed base plate being fixedly connected to a base, a first hydraulic push rod being installed at the bottom end of the fixed base plate, and the output end of the first hydraulic push rod being fixedly connected to the lifting push plate.

[0015] In one alternative: the discharge assembly includes: a discharge roller rotatably connected to the inside of one end of the discharge box, two second bevel gears symmetrically arranged on the outside of the discharge box, the discharge roller being located between the two second bevel gears, both second bevel gears being fixedly connected to the discharge roller, and the outer walls of both second bevel gears being meshed with first bevel gears;

[0016] A transmission component is installed on the first bevel gear.

[0017] In one alternative embodiment: the transmission assembly includes: a transmission shaft fixedly connected to the bottom end of the first bevel gear, a fixed sleeve plate rotatably sleeved on the outer wall of the transmission shaft, the fixed sleeve plate being fixedly connected to the feeding box, a transmission rod fixedly connected to the bottom end of the transmission shaft, a support block fixedly connected to the base being rotatably connected to the bottom end of the transmission rod, a sliding sleeve plate slidably sleeved on the outer wall of the transmission rod, the sliding sleeve plate passing through the base and fixedly connected to the fixed baffle, and the sliding sleeve plate being slidably connected to the base;

[0018] The sliding sleeve is equipped with a guide component.

[0019] In one alternative embodiment, the guide assembly includes multiple guide sliders that are circumferentially and equidistantly fixed to the inner wall of the sliding sleeve. The outer walls of the multiple guide sliders are all hemispherical, and a guide groove is provided at the junction of the transmission rod and the guide slider for the guide slider to slide.

[0020] In one alternative embodiment, the support assembly includes two first support plates symmetrically fixedly connected to the top of the base. The two first support plates are located between two movable push plates. Both first support plates are located at the end of the arrow shaft straightness detector near the feeding box. The top of the movable push plate is provided with multiple first limiting slots at equal intervals in the horizontal direction. The top of the first support plate is provided with multiple second limiting slots at equal intervals in the horizontal direction. The multiple first limiting slots and the multiple second limiting slots are respectively on the same horizontal line.

[0021] In one alternative: two second support plates are symmetrically fixedly connected to the top of the base, two movable push plates are located between the two second support plates, and a connecting rod is provided between the two second support plates. The connecting rod is rotatably connected to the two second support plates and is located above the two movable push plates. A limit plate is fixedly connected to the outer wall of the connecting rod.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] This invention, through a conveying mechanism, can accurately and orderly transfer arrows along the conveying path, avoiding the stacking and congestion of multiple arrows, and ensuring the continuity and stability of the feeding process. This achieves the purpose of conveying multiple arrows one by one at equal distances. At the same time, by collecting and discharging individual arrows, feeding can be completed one by one without an additional drive source, simplifying the equipment structure and reducing energy consumption. This further improves the efficiency of arrow detection and effectively enhances the accuracy and reliability of arrow detection results. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the internal structure of the base of this utility model.

[0026] Figure 3 This is a schematic diagram of the connection structure between the lifting push plate and the sliding push plate of this utility model.

[0027] Figure 4 This is a schematic diagram of the arrow shaft straightness tester of this utility model.

[0028] Figure 5 For the present utility model Figure 3 A magnified schematic diagram of the structure at point A in the diagram.

[0029] Figure reference numerals: 1. Base; 201. Movable push plate; 202. Linear guide rail; 203. Lifting push plate; 204. First bevel gear; 205. Transmission rod; 206. First hydraulic push rod; 207. Sliding push plate; 208. Second hydraulic push rod; 209. Fixed baffle; 2010. Sliding sleeve; 2011. Transmission shaft; 2012. First support plate; 2013. Discharge roller; 2014. Second bevel gear; 2015. Guide slider; 2016. Fixed base plate; 3. Guide block; 4. Discharge box; 5. Arrow shaft straightness tester; 6. Connecting rod; 7. Limiting pressure plate; 8. Second support plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] In one embodiment, such as Figures 1-5 As shown, a feeding device for arrow testing includes a base 1. A feeding box 4 is installed at one end of the top of the base 1, and a guide block 3 is fixedly connected to the other end of the top of the base 1. The upper surface of the guide block 3 is inclined, and the bottom of the inner wall of the feeding box 4 is inclined. A discharge port that communicates with the inner cavity of the feeding box 4 is opened at the end of the feeding box 4 near the guide block 3. The discharge port is located at the lowest position of the bottom of the inner wall of the feeding box 4. A receiving box is provided on the upper surface of one end of the base 1. The receiving box is located below the guide block 3, and the guide block 3 is located at the end of the feeding box 4. An arrow shaft straightness detector 5 is provided, which is fixedly connected to the base 1. Two second support plates 8 are symmetrically fixedly connected to the top of the base 1. Two movable push plates 201 are located between the two second support plates 8. A connecting rotating rod 6 is provided between the two second support plates 8. The connecting rotating rod 6 is rotatably connected to the two second support plates 8. The connecting rotating rod 6 is located above the two movable push plates 201. A limit pressure plate 7 is fixedly connected to the outer wall of the connecting rotating rod 6. A conveying mechanism for conveying arrows one by one at equal intervals is provided on the base 1.

[0032] In this application, the conveying mechanism includes: a sliding push plate 207 disposed inside the base 1, two movable push plates 201 symmetrically fixedly connected to the top of the sliding push plate 207, both movable push plates 201 extending through to the outside of the top of the base 1, both movable push plates 201 being slidably connected to the base 1, both movable push plates 201 being located between the guide block 3 and the feeding box 4, and the arrow shaft straightness detector 5 being located between the two movable push plates 201;

[0033] In this embodiment, it should be specifically noted that: the arrow shaft straightness tester 5 uses a reference support assembly to horizontally support the arrow shaft. Using a displacement sensor (such as a laser, inductive sensor, or dial indicator) installed on a slide that can move along the arrow shaft axis, the distance between the arrow shaft surface and the reference line is accurately measured at a preset detection point to obtain the bending deviation value. The drive and positioning system ensures that the sensor moves at a uniform speed and collects data evenly. Subsequently, the control system processes and analyzes the data, compares the actual deviation value at each point with the standard value, generates a straightness curve, and determines whether the arrow shaft is qualified.

[0034] In use, multiple arrows to be tested are placed inside the feeding box 4. Under the action of gravity, the arrows roll along the bottom of the inner wall of the feeding box 4 and accumulate inside one end of the feeding box 4. Then, through the conveying mechanism, one arrow can roll along the inner wall of the feeding box 4 under the action of gravity to the discharge port and fall down. At the same time, the conveying mechanism limits and supports one arrow and conveys it at equal distances. Then, the above operation is repeated to convey multiple arrows one by one at equal distances.

[0035] When an arrow is delivered to the arrow shaft straightness tester 5, the limiting pressure plate 7 contacts the outer wall of the arrow. Then, the arrow shaft straightness tester 5 tests the straightness of the arrow. During this process, if the arrow is qualified, the arrow rotates smoothly. If the arrow is unqualified, the arrow swings more. At the same time, through the cooperation of the limiting pressure plate 7, the connecting rotating rod 6 and the second support plate 8, the arrow can be limited, which can effectively prevent the arrow from swinging too much and falling off the arrow shaft straightness tester 5.

[0036] After an arrow is inspected, it can be guided to the receiving box by guide block 3. Defective arrows can be removed manually. This allows for the automatic inspection of multiple arrows one by one, thereby further improving the efficiency of arrow inspection.

[0037] In one embodiment, such as Figures 1-3 As shown, the conveying mechanism also includes: a first pushing component disposed on the base 1;

[0038] The first push component includes: a fixed baffle 209 slidably connected inside the base 1, the fixed baffle 209 being located at one end of the sliding push plate 207, and a second hydraulic push rod 208 being installed at the end of the fixed baffle 209 away from the sliding push plate 207, the output end of the second hydraulic push rod 208 being fixedly connected to the sliding push plate 207.

[0039] The fixed baffle 209 is provided with a second pushing component for pushing the sliding push plate 207 upward;

[0040] The feeding box 4 is equipped with a discharge assembly for the individual discharge of arrows;

[0041] The base 1 is provided with a support component for supporting the arrow;

[0042] The second pushing component includes: a lifting push plate 203 fixedly connected to one end of the fixed baffle 209, the lifting push plate 203 being located below the sliding push plate 207, two linear guide rails 202 being symmetrically fixedly connected to the top of the lifting push plate 203, the sliding push plate 207 being slidably sleeved on the outer wall of the two linear guide rails 202, a fixed base plate 2016 being provided on the lower surface of the lifting push plate 203, the fixed base plate 2016 being fixedly connected to the base 1, a first hydraulic push rod 206 being installed at the bottom end of the fixed base plate 2016, and the output end of the first hydraulic push rod 206 being fixedly connected to the lifting push plate 203;

[0043] The support assembly includes two first support plates 2012 symmetrically fixedly connected to the top of the base 1. The two first support plates 2012 are located between two movable push plates 201. Both first support plates 2012 are located at the end of the arrow shaft straightness detector 5 near the feeding box 4. The top of the movable push plate 201 is provided with multiple first limiting slots at equal intervals in the horizontal direction. The top of the first support plate 2012 is provided with multiple second limiting slots at equal intervals in the horizontal direction. The multiple first limiting slots and the multiple second limiting slots are respectively on the same horizontal line. Through the mutual cooperation of the first pushing assembly, the second pushing assembly and the support assembly, the purpose of feeding multiple arrows one by one at equal intervals can be achieved by the mutual misalignment and reset of the movable push plate 201 and the first support plate 2012.

[0044] In one embodiment, such as Figures 1-5 As shown, the discharge assembly includes: a discharge roller 2013 rotatably connected to the inside of one end of the discharge box 4; a receiving groove is provided on the outer wall of the discharge roller 2013 near the discharge port; two second bevel gears 2014 are symmetrically arranged on the outer side of the discharge box 4; the discharge roller 2013 is located between the two second bevel gears 2014; both second bevel gears 2014 are fixedly connected to the discharge roller 2013; and the outer walls of both second bevel gears 2014 are meshed with first bevel gears 204.

[0045] A transmission assembly is provided on the first bevel gear 204;

[0046] The transmission assembly includes: a transmission shaft 2011 fixedly connected to the bottom end of the first bevel gear 204; a fixed sleeve plate rotatably sleeved on the outer wall of the transmission shaft 2011; the fixed sleeve plate is fixedly connected to the feeding box 4; a transmission rod 205 fixedly connected to the bottom end of the transmission shaft 2011; a support block fixedly connected to the base 1 rotatably connected to the bottom end of the transmission rod 205; a sliding sleeve plate 2010 slidably sleeved on the outer wall of the transmission rod 205; the sliding sleeve plate 2010 passes through the base 1 and is fixedly connected to the fixed baffle 209; and the sliding sleeve plate 2010 is slidably connected to the base 1.

[0047] A guide assembly is provided on the sliding sleeve 2010;

[0048] The guiding assembly includes multiple guide sliders 2015 that are circumferentially and equidistantly fixed to the inner wall of the sliding sleeve plate 2010. The outer walls of the multiple guide sliders 2015 are all hemispherical. A guide groove is provided at the junction of the transmission rod 205 and the guide slider 2015 for the guide slider 2015 to slide. Through the cooperation of the discharge assembly, the transmission assembly and the guiding assembly, the arrows placed inside the discharge box 4 can be discharged one by one while the arrows are being conveyed at equal intervals.

[0049] The above embodiments disclose a feeding device for arrow testing. In use, multiple arrows to be tested are placed inside the feeding box 4. At this time, under the action of gravity, the arrows roll along the bottom of the inner wall of the feeding box 4 and accumulate inside one end of the feeding box 4, while contacting the outer wall of the discharge roller 2013.

[0050] Then, the first hydraulic push rod 206 is activated to push the lifting push plate 203 upward. At this time, the lifting push plate 203 separates from the upper surface of the fixed base plate 2016 through movement. Simultaneously, the sliding push plate 207, driven by the lifting push plate 203 via the linear guide 202, pushes the two moving push plates 201 upward synchronously. At this time, the fixed baffle 209, driven by the lifting push plate 203, drives the second hydraulic push rod 208 and the sliding sleeve 2010 to rise synchronously. At the same time, the guide slider 2015, driven by the sliding sleeve 2010, squeezes the inner wall of the guide groove. At this time, the transmission rod 205, driven by the outer wall of the guide slider 2015 through the guide groove, passes through the transmission shaft. 2011 drives the first bevel gear 204 to rotate, and at the same time, the second bevel gear 2014, driven by the meshing of the first bevel gear 204, drives the discharge roller 2013 to rotate until the guide slider 2015 contacts the top of the inner wall of the guide groove. At this time, the storage groove moves to the other end of the discharge roller 2013 under the drive of the discharge roller 2013. At the same time, an arrow rolls into the inside of the storage groove under the action of gravity, so that the arrow can be conveniently stored separately. Furthermore, the first limiting sleeve groove is higher than the upper surface of the first support plate 2012 under the drive of the moving push plate 201, so that the arrow can be pushed to separate from the first support plate 2012 by the moving push plate 201.

[0051] Then, the second hydraulic push rod 208 is activated to push the sliding push plate 207 to slide along the outer wall of the two linear guide rails 202. At this time, the moving push plate 201 moves synchronously under the drive of the sliding push plate 207. Simultaneously, the first limiting sleeve groove moves under the drive of the moving push plate 201. Then, the first hydraulic push rod 206 and the second hydraulic push rod 208 are activated in sequence, first driving the lifting push plate 203 to descend, and then driving the sliding push plate 207 to reset. Furthermore, the descent of the lifting push plate 203 can cause the discharge roller 2013 to rotate and reset. Meanwhile, the arrow rolls along the inner wall of the discharge box 4 to the discharge port under the drive of the discharge roller 2013 through the receiving groove. At this time, the arrow falls through the discharge port under the action of gravity. At the same time, the two first support plates 2012 support the arrow through a second limiting sleeve groove. Then, the above operation is repeated. In this way, when the arrow is being conveyed, the arrow on the second limiting sleeve groove can be placed on the next second limiting sleeve groove by moving the push plate 201. In this way, multiple arrows can be conveyed one by one at equal distance.

[0052] When an arrow is delivered to the arrow shaft straightness tester 5, the limiting pressure plate 7 rotates under the push of the arrow via the connecting rod 6, so that the limiting pressure plate 7 contacts the outer wall of the arrow. Then, the arrow shaft straightness tester 5 performs a straightness test on the arrow. During this process, if the arrow is qualified, the arrow rotates smoothly. At this time, the limiting pressure plate 7 will not swing much around the connecting rod 6 under the push of the arrow's rotation. If the arrow is unqualified, the swing amplitude of the arrow's rotation is large. At this time, the limiting pressure plate 7 will swing much more around the connecting rod 6 under the push of the arrow's rotation. At the same time, the limiting pressure plate 7 can limit the arrow, effectively preventing the arrow from swinging too much and causing the arrow to fall off the arrow shaft straightness tester 5.

[0053] After an arrow is inspected, the inspected arrow can be placed on the upper surface of the guide block 3 by moving the push plate 201. At this time, the arrow rolls down the outer wall of the guide block 3 into the collection box under the action of gravity, so that qualified arrows can be collected conveniently. At the same time, unqualified arrows can be removed manually. During this process, the limiting pressure plate 7 rotates under the squeezing and pushing of the arrow. When an arrow comes into contact with the upper surface of the guide block 3, the limiting pressure plate 7 separates from the arrow and comes into contact with the outer wall of the next arrow. This allows multiple arrows to be automatically inspected one by one, thereby further improving the efficiency of arrow inspection.

[0054] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A feeding device for arrow testing, comprising a base (1), wherein a feeding box (4) is installed at one end of the top of the base (1), and a guide block (3) is fixedly connected to the other end of the top of the base (1). The upper surface of the guide block (3) is inclined, and the bottom end of the inner wall of the feeding box (4) is inclined. A discharge port communicating with the inner cavity of the feeding box (4) is opened at one end of the feeding box (4) near the guide block (3). An arrow shaft straightness detector (5) is provided at one end of the guide block (3) near the feeding box (4). The arrow shaft straightness detector (5) is fixedly connected to the base (1). The base (1) is provided with a conveying mechanism for conveying the arrows one by one at equal intervals; The conveying mechanism includes: a sliding push plate (207) set inside the base (1), two movable push plates (201) symmetrically fixedly connected to the top of the sliding push plate (207), both movable push plates (201) extending through to the outside of the top of the base (1), both movable push plates (201) slidingly connected to the base (1), both movable push plates (201) located between the guide block (3) and the feeding box (4), and the arrow shaft straightness detector (5) located between the two movable push plates (201).

2. The feeding device for arrow testing according to claim 1, characterized in that, The conveying mechanism further includes: a first pushing component disposed on the base (1); The first push component includes: a fixed baffle (209) slidably connected inside the base (1), the fixed baffle (209) being located at one end of the sliding push plate (207), and a second hydraulic push rod (208) being installed at the end of the fixed baffle (209) away from the sliding push plate (207), the output end of the second hydraulic push rod (208) being fixedly connected to the sliding push plate (207); The fixed baffle (209) is provided with a second pushing component for pushing the sliding push plate (207) to rise; The feeding box (4) is equipped with a discharge assembly for individually discharging the arrows; The base (1) is provided with a support component for supporting the arrow.

3. The arrow testing feeding device according to claim 2, characterized in that, The second pushing component includes: a lifting push plate (203) fixedly connected to one end of a fixed baffle (209), the lifting push plate (203) being located below a sliding push plate (207), two linear guide rails (202) being symmetrically fixedly connected to the top of the lifting push plate (203), the sliding push plate (207) being slidably sleeved on the outer wall of the two linear guide rails (202), a fixed base plate (2016) being provided on the lower surface of the lifting push plate (203), the fixed base plate (2016) being fixedly connected to the base (1), a first hydraulic push rod (206) being installed at the bottom end of the fixed base plate (2016), and the output end of the first hydraulic push rod (206) being fixedly connected to the lifting push plate (203).

4. The arrow testing feeding device according to claim 2, characterized in that, The discharge assembly includes: a discharge roller (2013) rotatably connected to the inside of one end of the discharge box (4); two second bevel gears (2014) are symmetrically arranged on the outside of the discharge box (4); the discharge roller (2013) is located between the two second bevel gears (2014); both second bevel gears (2014) are fixedly connected to the discharge roller (2013); and the outer walls of both second bevel gears (2014) are meshed with first bevel gears (204). A transmission assembly is provided on the first bevel gear (204).

5. The arrow testing feeding device according to claim 4, characterized in that, The transmission assembly includes: a transmission shaft (2011) fixedly connected to the bottom end of the first bevel gear (204), a fixed sleeve plate rotatably sleeved on the outer wall of the transmission shaft (2011), the fixed sleeve plate being fixedly connected to the feeding box (4), a transmission rod (205) fixedly connected to the bottom end of the transmission shaft (2011), a support block fixedly connected to the base (1) rotatably connected to the bottom end of the transmission rod (205), a sliding sleeve plate (2010) slidably sleeved on the outer wall of the transmission rod (205), the sliding sleeve plate (2010) passing through the base (1) and fixedly connected to the fixed baffle (209), and the sliding sleeve plate (2010) being slidably connected to the base (1); A guide assembly is provided on the sliding sleeve (2010).

6. The arrow testing feeding device according to claim 5, characterized in that, The guide assembly includes: multiple guide sliders (2015) that are circumferentially and equidistantly fixed on the inner wall of the sliding sleeve (2010). The outer walls of the multiple guide sliders (2015) are all hemispherical. A guide groove is provided at the junction of the transmission rod (205) and the guide sliders (2015) for the guide sliders (2015) to slide.

7. The feeding device for arrow testing according to claim 2, characterized in that, The support assembly includes two first support plates (2012) symmetrically fixedly connected to the top of the base (1). The two first support plates (2012) are located between two movable push plates (201). Both first support plates (2012) are located at the end of the arrow shaft straightness detector (5) near the feeding box (4). The top of the movable push plate (201) is provided with multiple first limiting slots at equal intervals in the horizontal direction. The top of the first support plate (2012) is provided with multiple second limiting slots at equal intervals in the horizontal direction. The multiple first limiting slots and the multiple second limiting slots are respectively on the same horizontal line.

8. The arrow testing feeding device according to claim 1, characterized in that, Two second support plates (8) are symmetrically fixedly connected to the top of the base (1). Two movable push plates (201) are located between the two second support plates (8). A connecting rod (6) is provided between the two second support plates (8). The connecting rod (6) is rotatably connected to the two second support plates (8). The connecting rod (6) is located above the two movable push plates (201). A limit plate (7) is fixedly connected to the outer wall of the connecting rod (6).

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