Positioning device for plastic bottle packaging and printing
By designing a plastic bottle positioning device including push plate and bottle door stop plate, the problem of pressure deformation of plastic bottles during printing is solved, and the effect of improving printing quality is achieved.
Patent Information
- Application Number
- CN202421975005.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-08-15
AI Technical Summary
The existing positioning device for plastic bottle packaging printing is likely to cause the plastic bottle to be compressed and deformed during the printing process, affecting the printing quality.
A positioning device including a push plate and a bottle-mouth stopper is designed. The plastic bottle is pushed to the carrier through the push plate, and the plastic bottle is clamped with the bottle-mouth stopper, and the plastic bottle is filled with air to avoid pressure deformation.
Effectively prevent plastic bottles from being compressed and deformed during the printing process and improve printing quality.
Smart Images
Figure CN222892570U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of plastic bottle packaging and printing, and in particular to a positioning device for plastic bottle packaging and printing. Background Art
[0002] After the plastic bottles are produced and processed, decorative patterns, designs or text logos need to be printed on the outer packaging of the plastic bottles to make the products more attractive or more descriptive. During printing, a positioning device is needed to fix the placement of the plastic bottles to prevent the plastic bottles from shifting during the printing process and affecting the printing effect.
[0003] In the related art, although the positioning device for plastic bottle packaging printing can meet the basic needs for clamping and positioning plastic bottles, it is found in actual use that there are still at least the following shortcomings: during the period when the plastic bottles are clamped and fixed for printing, when printing on some relatively soft and easily deformed plastic bottles, the printing template on the printing machine applies a certain pressure to the plastic bottles during the printing process, which can easily cause the plastic bottles to be compressed and deformed, thereby reducing the printing quality.
[0004] Therefore, we propose a positioning device for plastic bottle packaging printing to solve the above problems. Utility Model Content
[0005] The purpose of the present application is to provide a positioning device for plastic bottle packaging printing, which can push the plastic bottles conveyed on the conveyor belt onto the supporting seat, and can clamp and position the plastic bottles on the supporting seat by utilizing the cooperation of the push plate and the bottle mouth baffle, and can fill air into the clamped and positioned plastic bottles to avoid deformation of the plastic bottles due to pressure during the printing process, thereby improving the printing quality.
[0006] The above-mentioned technical purpose of the present application is achieved through the following technical solutions: a positioning device for plastic bottle packaging and printing, including a machine platform and a conveying trough opened on the machine platform, a conveyor belt for horizontally conveying plastic bottles is rotatably installed in the conveying trough, a bearing seat located on the right side of the conveyor belt is fixedly installed in the conveying trough, a U-shaped frame is fixedly installed on the top of the machine platform, a crossbeam is fixedly installed on the right side of the U-shaped frame, a printing press located above the bearing seat is fixedly installed on the bottom of the crossbeam, a guide mechanism for guiding and limiting the conveying direction of the plastic bottles is arranged on the U-shaped frame, a pushing positioning mechanism for pushing the plastic bottles is also arranged on the U-shaped frame, a vertical plate is fixedly installed on the top of the bearing seat, and an air blowing positioning mechanism for blowing air into the plastic bottle is arranged on the left side of the vertical plate.
[0007] By adopting the above technical scheme, the conveyor belt is used to transport plastic bottles horizontally and linearly, the printing machine is used to print the packaging of plastic bottles, the pushing and positioning mechanism is used to push the plastic bottles on the conveyor belt to the supporting seat, and the blowing and positioning mechanism is used to fill air into the plastic bottles. During the printing process, the plastic bottles are prevented from being compressed and deformed to affect the printing quality.
[0008] The present application is further configured as follows: the guiding mechanism includes two hydraulic cylinders and two limit baffles, the two hydraulic cylinders are respectively fixedly mounted on the front outer wall and the rear outer wall of the U-shaped frame, the output shaft ends of the two hydraulic cylinders extend into the U-shaped frame, the two limit baffles are respectively fixedly mounted on the output shaft ends of the corresponding hydraulic cylinders, and the bottoms of the two limit baffles extend into the conveying trough and are located above the conveyor belt.
[0009] By adopting the above technical solution and utilizing the telescopic characteristics of the two hydraulic cylinders, the distance between the two limit baffles can be adjusted, and the cooperation of the two limit baffles can ensure that the conveyor belt drives the plastic bottles to move horizontally and linearly.
[0010] The present application is further configured as follows: the pushing and positioning mechanism includes a first electric telescopic rod, an L-shaped plate, a second electric telescopic rod and a push plate, the first electric telescopic rod is fixedly mounted on the top inner wall of the U-shaped frame, the L-shaped plate is fixedly mounted on the output shaft end of the first electric telescopic rod, the second electric telescopic rod is fixedly mounted on the L-shaped plate, and the push plate is fixedly mounted on the output shaft end of the second electric telescopic rod.
[0011] By adopting the above technical solution, the push plate can be controlled to move vertically by utilizing the telescopic characteristics of the first electric telescopic rod, and the push plate can be controlled to move horizontally by utilizing the telescopic characteristics of the second electric telescopic rod, and the push plate can be used to push the plastic bottle to move linearly.
[0012] The present application is further configured as follows: the push plate is located between two limit baffles.
[0013] By adopting the above technical solution, it can be ensured that the push plate will not touch the limit baffle when it descends.
[0014] The present application is further configured as follows: the air blowing positioning mechanism includes an electric guide rail, an electric slide, a third electric telescopic rod, a bottle mouth baffle, an air pump and an L-shaped air outlet pipe; the electric guide rail is fixedly mounted on the left side wall of the vertical plate; the electric slide is slidably mounted on the electric guide rail; the third electric telescopic rod is fixedly mounted on the left side wall of the electric slide; the bottle mouth baffle is fixedly mounted on the output shaft end of the third electric telescopic rod; the air pump is fixedly mounted on the right side wall of the bottle mouth baffle; one end of the L-shaped air outlet pipe is fixedly connected to the discharge end of the air pump; and the other end of the L-shaped air outlet pipe passes through the bottle mouth baffle.
[0015] By adopting the above technical scheme, the height positions of the bottle mouth baffle and the L-shaped air outlet pipe can be adjusted by utilizing the sliding connection of the electric slide seat on the electric guide rail, so that one end of the L-shaped air outlet pipe can be inserted into the bottle mouth of plastic bottles of different sizes for inflation. The bottle mouth baffle can be used to seal the bottle mouth of the plastic bottle to avoid leakage during inflation.
[0016] The present application is further configured as follows: the blowing positioning mechanism also includes a one-way valve and a pressure sensor, both of which are fixedly mounted on the L-shaped air outlet pipe, and the one-way valve is located between the pressure sensor and the air pump.
[0017] By adopting the above technical solution, the one-way valve is used to control the one-way flow of air in the L-shaped air outlet pipe, and backflow will not occur. The pressure sensor is used to detect the air pressure value in the L-shaped air outlet pipe, that is, to detect the air pressure value in the plastic bottle, so as to avoid deformation or bursting of the plastic bottle due to over-inflation.
[0018] The present application is further configured as follows: a plastic bottle discharge outlet located behind the supporting seat is opened on the rear side wall of the conveying trough, a fourth electric telescopic rod is fixedly installed on the front side wall of the conveying trough, an ejection plate is fixedly installed on the output shaft end of the fourth electric telescopic rod, and the ejection plate is located directly in front of the plastic bottle discharge outlet.
[0019] By adopting the above technical solution and utilizing the retractable characteristics of the fourth electric telescopic rod, the ejector plate can be controlled to move horizontally and linearly, and the ejector plate can be used to push the printed plastic bottles toward the plastic bottle discharge outlet, thereby pushing the printed plastic bottles out of the plastic bottle discharge outlet.
[0020] The present application is further configured as follows: the length dimension of the ejection plate is smaller than the inner length dimension of the plastic bottle discharge port.
[0021] By adopting the above technical solution, it can be ensured that the ejector plate passes through the plastic bottle discharge outlet smoothly, and the printed plastic bottles can be effectively pushed away.
[0022] The present application is further configured as follows: the upper surface of the conveyor belt is flush with the upper surface of the bearing seat.
[0023] By adopting the above technical solution, it can be ensured that the plastic bottles on the conveyor belt can be smoothly pushed and moved to the supporting seat.
[0024] The present application is further configured as follows: a cushion seat is fixedly mounted on the left side wall of the bearing seat, the left side of the cushion seat is an arc-shaped surface structure, and the upper surface of the cushion seat is flush with the upper surface of the bearing seat.
[0025] By adopting the above technical solution, the cushion seat is used to fill the gap between the conveyor belt and the supporting seat, thereby ensuring smoothness when the plastic bottles on the conveyor belt are pushed and moved to the supporting seat.
[0026] The present application includes at least one of the following beneficial technical effects:
[0027] 1. The present application utilizes a guide mechanism consisting of two hydraulic cylinders and two limit baffles to ensure that the plastic bottles move horizontally and linearly during the horizontal transmission of the plastic bottles using a conveyor belt.
[0028] 2. The present application utilizes a pushing and positioning mechanism composed of a first electric telescopic rod, an L-shaped plate, a second electric telescopic rod and a push plate, which can push the plastic bottles on the conveyor belt to the supporting seat. The push plate and the bottle mouth baffle plate work together to clamp and position the plastic bottles on the supporting seat to prevent the plastic bottles from being offset during the printing process.
[0029] 3. The present application utilizes an air blowing positioning mechanism composed of an electric guide rail, an electric slide, a third electric telescopic rod, a bottle mouth baffle, an air pump, an L-shaped air outlet pipe, a one-way valve and a pressure sensor, which can fill air into the clamped and positioned plastic bottle to avoid deformation of the plastic bottle due to pressure during the printing process, thereby improving the printing quality.
[0030] 4. The present application uses the fourth electric telescopic rod to control the horizontal linear movement of the ejector plate, and the ejector plate can be used to push the printed plastic bottle to move toward the plastic bottle discharge port, thereby pushing the printed plastic bottle out of the plastic bottle discharge port. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.
[0032] Figure 2 It is a schematic diagram of the main cross-sectional structure of this embodiment.
[0033] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part A.
[0034] Figure 4 It is a three-dimensional structural schematic diagram of the air blowing positioning mechanism.
[0035] In the figure, 1, machine table; 2, conveying trough; 3, conveyor belt; 4, bearing seat; 5, U-shaped frame; 6, crossbeam; 7, printing press; 8, hydraulic cylinder; 9, limit baffle; 10, first electric telescopic rod; 11, L-shaped plate; 12, second electric telescopic rod; 13, push plate; 14, vertical plate; 15, electric guide rail; 16, electric slide seat; 17, third electric telescopic rod; 18, bottle mouth baffle; 19, air pump; 20, L-shaped air outlet pipe; 21, one-way valve; 22, pressure sensor; 23, plastic bottle discharge port; 24, fourth electric telescopic rod; 25, ejector plate; 26, cushion seat. DETAILED DESCRIPTION
[0036] The technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.
[0037] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The present application provides a positioning device for plastic bottle packaging printing, comprising a machine platform 1 and a conveying trough 2 provided on the machine platform 1, wherein a conveying belt 3 for horizontally conveying plastic bottles is rotatably installed in the conveying trough 2, wherein:
[0038] A bearing seat 4 located on the right side of the conveyor belt 3 is fixedly installed in the conveying trough 2, a U-shaped frame 5 is fixedly installed on the top of the machine table 1, a crossbeam 6 is fixedly installed on the right side of the U-shaped frame 5, and a printing machine 7 located above the bearing seat 4 is fixedly installed at the bottom of the crossbeam 6. A guiding mechanism for guiding and limiting the conveying direction of the plastic bottles is provided on the U-shaped frame 5, and the guiding mechanism includes two hydraulic cylinders 8 and two limit baffles 9. The two hydraulic cylinders 8 are respectively fixedly installed on the front outer wall and the rear outer wall of the U-shaped frame 5, and the output shaft ends of the two hydraulic cylinders 8 extend into the U-shaped frame 5. The two limit baffles 9 are respectively fixedly installed on the output shaft ends of the corresponding hydraulic cylinders 8, and the bottoms of the two limit baffles 9 extend into the conveying trough 2 and are located above the conveyor belt 3. Figure 1 As shown, the two hydraulic cylinders 8 are both in an extended but not fully extended state, the U-shaped frame 5 is also provided with a pushing positioning mechanism for pushing the plastic bottles, a vertical plate 14 is fixedly installed on the top of the supporting seat 4, and a blowing positioning mechanism for blowing air into the plastic bottles is provided on the left side of the vertical plate 14.
[0039] In this embodiment, the above-mentioned pushing and positioning mechanism includes a first electric telescopic rod 10, an L-shaped plate 11, a second electric telescopic rod 12 and a push plate 13. The first electric telescopic rod 10 is fixedly mounted on the top inner wall of the U-shaped frame 5, the L-shaped plate 11 is fixedly mounted on the output shaft end of the first electric telescopic rod 10, the second electric telescopic rod 12 is fixedly mounted on the L-shaped plate 11, and the push plate 13 is fixedly mounted on the output shaft end of the second electric telescopic rod 12.
[0040] In this embodiment, the above-mentioned air blowing positioning mechanism includes an electric guide rail 15, an electric slide 16, a third electric telescopic rod 17, a bottle mouth baffle 18, an air pump 19, an L-shaped air outlet pipe 20, a one-way valve 21 and a pressure sensor 22. The electric guide rail 15 is fixedly mounted on the left side wall of the vertical plate 14, the electric slide 16 is slidably mounted on the electric guide rail 15, the third electric telescopic rod 17 is fixedly mounted on the left side wall of the electric slide 16, the bottle mouth baffle 18 is fixedly mounted on the output shaft end of the third electric telescopic rod 17, the air pump 19 is fixedly mounted on the right side wall of the bottle mouth baffle 18, one end of the L-shaped air outlet pipe 20 is fixedly connected to the discharge end of the air pump 19, the other end of the L-shaped air outlet pipe 20 passes through the bottle mouth baffle 18, the one-way valve 21 and the pressure sensor 22 are both fixedly mounted on the L-shaped air outlet pipe 20, and the one-way valve 21 is located between the pressure sensor 22 and the air pump 19, as shown in FIG. Figure 3 As shown, the third electric telescopic rod 17 is in a fully extended state.
[0041] In this embodiment, the push plate 13 is located between the two limit baffles 9 .
[0042] In this embodiment, a plastic bottle discharge outlet 23 located behind the supporting seat 4 is opened on the rear side wall of the conveying trough 2, and a fourth electric telescopic rod 24 is fixedly installed on the front side wall of the conveying trough 2. An ejection plate 25 is fixedly installed on the output shaft end of the fourth electric telescopic rod 24. The ejection plate 25 is located directly in front of the plastic bottle discharge outlet 23, and the length of the ejection plate 25 is smaller than the inner length of the plastic bottle discharge outlet 23.
[0043] In this embodiment, the upper surface of the conveyor belt 3 is flush with the upper surface of the bearing seat 4. A cushion seat 26 is fixedly installed on the left side wall of the bearing seat 4. The left side of the cushion seat 26 is an arc-shaped surface structure, and the upper surface of the cushion seat 26 is flush with the upper surface of the bearing seat 4.
[0044] In the present embodiment, it should be supplemented that the hydraulic cylinder 8, the first electric telescopic rod 10, the second electric telescopic rod 12, the electric guide rail 15, the electric slide 16, the third electric telescopic rod 17, the air pump 19, the pressure sensor 22 and the fourth electric telescopic rod 24 are all electrically connected to the external control switch, and the control switch can be used to control the hydraulic cylinder 8, the first electric telescopic rod 10, the second electric telescopic rod 12, the electric guide rail 15, the electric slide 16, the third electric telescopic rod 17, the air pump 19, the pressure sensor 22 and the fourth electric telescopic rod 24 to be powered on and operated respectively, and the pressure sensor 22 is connected to the external display screen by wire, and the pressure value detected by the pressure sensor 22 can be displayed by the display screen. The line connection method and control method belong to the mature technology in this field, so they are fully disclosed and explained, and therefore they will not be described in detail herein.
[0045] Through the above structure, the positioning device for plastic bottle packaging and printing provided by the present application can push the plastic bottles conveyed on the conveyor belt 3 to the supporting seat 4 when in use. By utilizing the cooperation of the push plate 13 and the bottle mouth baffle 18, the plastic bottle can be clamped and positioned on the supporting seat 4, and air can be filled into the clamped and positioned plastic bottle to avoid deformation of the plastic bottle due to pressure during the printing process, thereby improving the printing quality. In specific operation, according to the diameter of the plastic bottle and the height of the bottle mouth, the two limit baffles 9 can be controlled to move closer to each other by controlling the extension of the two hydraulic cylinders 8, and the spacing between the two limit baffles 9 is adjusted to be slightly larger than the diameter of the plastic bottle (larger than 2-4mm of the diameter of the plastic bottle). , stop the operation of the two hydraulic cylinders 8, and control the electric slide 16 to slide on the electric guide rail 15, so that the end of the L-shaped air outlet pipe 20 away from the air pump 19 can be adjusted to a suitable height position (that is, the end of the L-shaped air outlet pipe 20 away from the air pump 19 is aligned with the bottle mouth of the plastic bottle), and then the produced and packaged plastic bottles are placed between the two limit baffles 9 on the conveyor belt 3, and the bottle mouth of the plastic bottle is directed to the bottle mouth baffle 18. The conveyor belt 3 can be used to convey the plastic bottles to the left and right horizontally in a straight line. When the plastic bottles are conveyed to the right side of the push plate 13, the push plate 13 can be controlled to move down to the point of contacting the conveyor belt 3 by controlling the first electric telescopic rod 10 to extend, and the push plate 13 can be pushed to the right in a straight line by controlling the second electric telescopic rod 12 to extend. The push plate 13 is used to push the plastic bottle onto the supporting seat 4, so that the bottle mouth of the plastic bottle is tightly against the left wall of the bottle mouth baffle 18, and the second electric telescopic rod 12 is stopped. At this time, the end of the L-shaped air outlet pipe 20 away from the air pump 19 is inserted into the bottle mouth of the plastic bottle, and the bottle mouth baffle 18 seals the bottle mouth of the plastic bottle, that is, the plastic bottle is clamped and positioned on the supporting seat 4, and then the air pump 19 is turned on and the pressure sensor 22 is turned on to fill the plastic bottle with a proper amount of air so that the plastic bottle has a suitable air pressure, and then the printing machine 7 is controlled to run, and printing can be performed on the packaging of the plastic bottle. During the printing process, it can be ensured that the plastic bottle will not deviate and will not be deformed by pressure. After printing is completed, the second electric telescopic rod 12 is controlled to run. The second electric telescopic rod 12 and the first electric telescopic rod 10 are retracted and reset, so that the push plate 13 can be controlled to return to the original position. The third electric telescopic rod 17 is controlled to retract and reset, so that the bottle mouth baffle 18 and the L-shaped air outlet pipe 20 can be controlled to move to the right, so that the clamping and positioning of the plastic bottle can be released. Then, the fourth electric telescopic rod 24 is controlled to extend and run, so that the ejection plate 25 can be controlled to move horizontally and linearly. The ejection plate 25 can be used to push the printed plastic bottle to move in the direction of the plastic bottle discharge port 23, and then the printed plastic bottle can be pushed out of the plastic bottle discharge port 23. After the plastic bottle is pushed out, the fourth electric telescopic rod 24 is controlled to retract and reset, so that the ejection plate 25 can be controlled to return to the original position. By controlling the third electric telescopic rod 17 to extend, the bottle mouth baffle 18 can be pushed to move back to the left.According to the above steps, you can continue to print the next plastic bottle.
Claims
1. A positioning device for plastic bottle packaging printing, characterized in that: The invention comprises a machine platform (1) and a conveying trough (2) provided on the machine platform (1), wherein a conveying belt (3) for horizontally conveying plastic bottles is rotatably installed in the conveying trough (2), a bearing seat (4) located on the right side of the conveying belt (3) is fixedly installed in the conveying trough (2), a U-shaped frame (5) is fixedly installed on the top of the machine platform (1), a crossbeam (6) is fixedly installed on the right side of the U-shaped frame (5), a printing machine (7) located above the bearing seat (4) is fixedly installed on the bottom of the crossbeam (6), a guiding mechanism for guiding and limiting the conveying direction of the plastic bottles is arranged on the U-shaped frame (5), a pushing positioning mechanism for pushing the plastic bottles is also arranged on the U-shaped frame (5), a vertical plate (14) is fixedly installed on the top of the bearing seat (4), and a blowing positioning mechanism for blowing air into the plastic bottles is arranged on the left side of the vertical plate (14).
2. A positioning device for plastic bottle packaging printing according to claim 1, characterized in that: The guide mechanism comprises two hydraulic cylinders (8) and two limit baffles (9), the two hydraulic cylinders (8) are respectively fixedly mounted on the front outer wall and the rear outer wall of the U-shaped frame (5), the output shaft ends of the two hydraulic cylinders (8) extend into the U-shaped frame (5), the two limit baffles (9) are respectively fixedly mounted on the output shaft ends corresponding to the hydraulic cylinders (8), and the bottoms of the two limit baffles (9) extend into the conveying trough (2) and are located above the conveyor belt (3).
3. A positioning device for plastic bottle packaging printing according to claim 2, characterized in that: The push positioning mechanism comprises a first electric telescopic rod (10), an L-shaped plate (11), a second electric telescopic rod (12) and a push plate (13); the first electric telescopic rod (10) is fixedly mounted on the top inner wall of the U-shaped frame (5); the L-shaped plate (11) is fixedly mounted on the output shaft end of the first electric telescopic rod (10); the second electric telescopic rod (12) is fixedly mounted on the L-shaped plate (11); and the push plate (13) is fixedly mounted on the output shaft end of the second electric telescopic rod (12).
4. A positioning device for plastic bottle packaging printing according to claim 3, characterized in that: The push plate (13) is located between the two limit baffles (9).
5. A positioning device for plastic bottle packaging printing according to claim 1, characterized in that: The air blowing positioning mechanism comprises an electric guide rail (15), an electric slide seat (16), a third electric telescopic rod (17), a bottle mouth baffle (18), an air pump (19) and an L-shaped air outlet pipe (20), wherein the electric guide rail (15) is fixedly mounted on the left side wall of the vertical plate (14), the electric slide seat (16) is slidably mounted on the electric guide rail (15), the third electric telescopic rod (17) is fixedly mounted on the left side wall of the electric slide seat (16), the bottle mouth baffle (18) is fixedly mounted on the output shaft end of the third electric telescopic rod (17), the air pump (19) is fixedly mounted on the right side wall of the bottle mouth baffle (18), one end of the L-shaped air outlet pipe (20) is fixedly connected to the discharge end of the air pump (19), and the other end of the L-shaped air outlet pipe (20) passes through the bottle mouth baffle (18).
6. A positioning device for plastic bottle packaging printing according to claim 5, characterized in that: The air blowing positioning mechanism further comprises a one-way valve (21) and a pressure sensor (22); the one-way valve (21) and the pressure sensor (22) are both fixedly mounted on the L-shaped air outlet pipe (20); and the one-way valve (21) is located between the pressure sensor (22) and the air pump (19).
7. A positioning device for plastic bottle packaging printing according to claim 1, characterized in that: A plastic bottle discharge outlet (23) located behind the bearing seat (4) is provided on the rear side wall of the conveying trough (2), a fourth electric telescopic rod (24) is fixedly mounted on the front side wall of the conveying trough (2), an ejection plate (25) is fixedly mounted on the output shaft end of the fourth electric telescopic rod (24), and the ejection plate (25) is located directly in front of the plastic bottle discharge outlet (23).
8. A positioning device for plastic bottle packaging printing according to claim 7, characterized in that: The length dimension of the ejection plate (25) is smaller than the inner length dimension of the plastic bottle discharge port (23).
9. A positioning device for plastic bottle packaging printing according to claim 1, characterized in that: The upper surface of the conveyor belt (3) is flush with the upper surface of the bearing seat (4).
10. A positioning device for plastic bottle packaging printing according to claim 9, characterized in that: A cushion seat (26) is fixedly mounted on the left side wall of the bearing seat (4); the left side of the cushion seat (26) is an arc-shaped surface structure; the upper surface of the cushion seat (26) is flush with the upper surface of the bearing seat (4).