A tracked cargo securing device for railway transportation with adjustable angle and longitudinal position

Abstract

The present invention relates to a railway transport crawler cargo fixing device with adjustable angle and position longitudinally, comprising: a vehicle stop part and a motor part; the vehicle stop part and the motor part are mounted on a carriage floor, and the position of the motor part on the carriage floor is fixed and cannot be moved; the motor part is used to push the vehicle stop part to move; the vehicle stop part comprises an end pin shaft 1, an end pin shaft 2, a center pin shaft, a plurality of diagonal braces, a vehicle stop floor and an angle adjustment plate; the vehicle stop floor is placed on the carriage floor close to the motor part, the angle adjustment plate is mounted above one end of the vehicle stop floor close to the motor part, and in the movement direction of the vehicle stop floor, the position of the angle adjustment plate on the vehicle stop floor is adjustable. The device of the present invention is compact, easy to install, safe and reliable, simple to operate and highly efficient. It has strong adaptability, and can change the fixed position of the angle adjustment plate on the vehicle stop floor to change the angle of the vehicle stop surface, and is suitable for reinforcement schemes of various different types of crawler cargo.

Description

Technical Field

[0001] The invention relates to railway cargo loading reinforcement, in particular to railway crawler cargo transportation. The crawler cargo can be fixed on a railway vehicle by the device to prevent the crawler cargo from shifting when the train is running. Background Art

[0002] With the development of science and technology, the number of crawler cargo has increased. When people use railways to transport crawler cargo, they must be stably fixed on the railway vehicles to prevent the crawler cargo from shifting when the railway vehicles are connected or braked, thereby causing damage to the cargo or even personal danger. At present, the railway transportation of crawler cargo generally adopts methods such as pulling ropes, wheel chocks, special floors, and rivet reinforcement.

[0003] The strength of the pull rope is limited, and the force on each pull rope cannot be too large. Multiple pull ropes are needed to fix the goods. When the force is uneven, the pull rope is easy to break and damage the goods. Moreover, there are many types of pull ropes, and it is not easy to choose a suitable pull rope. It is also difficult to reinforce, the operation time is long, and the manpower and material costs invested are too high.

[0004] Wheel chocks are more suitable for automobile transportation. They have a small contact area with the cargo and are mostly suitable for elastic rubber tires. If used for steel tracked freight transportation, the wheel chocks and tracks will be damaged.

[0005] Special floor is generally made of plain carbon steel, with convex and concave grooves, which is more suitable for the transportation of rubber tire cargo, and can prevent the cargo from moving when transporting tire cargo. If it is used to transport crawler cargo, the steel crawler will collide and squeeze with this special vehicle floor, damaging the crawler and the vehicle floor, so this special vehicle floor is not suitable for transporting crawler cargo; and the special floor is expensive to make, difficult to install, and consumes a lot of human resources.

[0006] When loading crawler cargo, rivets are placed between the crawler and the wooden floor of the railway vehicle. After loading, the crawler presses the rivets into the wooden floor to fix the cargo. This reinforcement is extremely harmful to the floor of the railway vehicle, the maintenance cost is too high, and the rivets are not easy to pull out from the wooden floor after unloading.

[0007] The above reinforcement solutions are relatively backward in technology, and most of them are more suitable for tire-type cargo, but not for track-type cargo. Even if the traction ropes and rivets can meet the needs of railway transportation of track-type cargo, it will cost a lot, waste a lot of manpower and material resources, and the operation is relatively complicated, which is not conducive to railway transportation of track-type cargo. Summary of the invention

[0008] In view of the defects existing in the prior art, the purpose of the present invention is to provide a simple device to effectively solve the problems of high cost, labor and material consumption, complex operation, difficult reinforcement and low work efficiency when transporting crawler cargo. The present invention provides a loading reinforcement device based on crawler cargo transportation, which is suitable for a variety of different types of crawler cargo.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0010] A railway transport crawler cargo fixing device with adjustable angle and longitudinal position comprises: a vehicle stopper part and a motor part; the vehicle stopper part and the motor part are mounted on a carriage floor, the motor part is fixed on the carriage floor and cannot be moved; the motor part is used to push the vehicle stopper part to move;

[0011] The vehicle block part includes an end pin shaft 1 3, an end pin shaft 2 13, a center pin shaft 11, a plurality of diagonal braces, a vehicle block bottom plate 2 and an angle adjustment plate 4; the vehicle block bottom plate 2 is placed on the vehicle compartment bottom plate close to the motor part, the angle adjustment plate 4 is installed above one end of the vehicle block bottom plate 2 close to the motor part, and in the movement direction of the vehicle block bottom plate 2, the position of the angle adjustment plate 4 on the vehicle block bottom plate 2 is adjustable; the end pin shaft 2 13 is installed on the angle adjustment plate 4, and the end pin shaft 1 3 is installed at the end of the vehicle block bottom plate 2 away from the motor part; the axes of the end pin shaft 1 3, the end pin shaft 2 13 and the center pin shaft 11 are perpendicular to the movement direction of the vehicle block bottom plate 2; the plurality of diagonal braces are divided into two groups, one end of one group of diagonal braces is connected by the end pin shaft 1 3, and one end of the other group of diagonal braces is connected by the end pin shaft 2 13, and the other ends of the two groups of diagonal braces are connected by the center pin shaft, and the diagonal braces can rotate relative to the pin shaft, so that the angle between the two groups of diagonal braces can change with the installation position of the angle adjustment plate 4 on the vehicle block bottom plate 2.

[0012] On the basis of the above scheme, the motor part includes a push rod 8, a motor 9 and a screw 10, the motor 9 is installed on the carriage bottom plate through the motor bottom plate; the push rod 8 is connected to the motor bottom plate through the screw 10, the car block bottom plate 2 is placed on the carriage bottom plate close to the push rod 8, and the motor 9 pushes the car block part to move through the push rod 8;

[0013] On the basis of the above scheme, two rows of small screw holes are arranged in parallel on one end of the vehicle fender bottom plate 2 contacting the push rod 8, and the angle adjustment plate 4 is mounted on the vehicle fender bottom plate 2 through bolts and the small screw holes.

[0014] On the basis of the above scheme, the vehicle fender bottom plate 2 is made of steel plate, all small screw holes have the same diameter, the center lines of the two rows of small screw holes are parallel to each other and are parallel to the long side of the vehicle fender bottom plate; the angle adjustment plate 4 is provided with two screw holes, the spacing between which is the same as the spacing between the two rows of small screw holes on the vehicle fender bottom plate, and the angle adjustment plate 4 is installed on the vehicle fender bottom plate 2 by bolts, screw holes and small screw holes.

[0015] On the basis of the above scheme, two small columns protruding perpendicular to the vehicle guard bottom plate 2 are provided at one end of the vehicle guard bottom plate 2 away from the push rod 8, located at two vertex positions, and a pin hole is provided on each of the protruding small columns. The diameter of the pin hole is the same as the diameter of the end pin shaft 3, which is used to install the end pin shaft 3.

[0016] Based on the above scheme, one end of the angle adjustment plate 4 is provided with two small columns protruding perpendicular to the bottom plate of the vehicle fender, located at two vertex positions, and there is a pin hole on the protruding small columns respectively, and the diameter of the pin hole is the same as the diameter of the end pin shaft 13, which is used to install the end pin shaft 13.

[0017] On the basis of the above scheme, the push rod 8 is composed of a cross bar and two screw barrels, one side of the cross bar is in contact with the vehicle guard base plate 2, and the other side of the cross bar is connected to two screw barrels perpendicular to the cross bar, and the two screw barrels have the same length; the two screw barrels and the motor base plate are both provided with screw holes, and one end of the two screws 10 is respectively screwed into the screw barrels, and the other end is respectively screwed into the screw holes of the motor base plate.

[0018] On the basis of the above scheme, the center pin 11, the end pin 1 3 and the end pin 2 13 are steel cylinders.

[0019] The end pin shaft 1 3 and the end pin shaft 2 13 have the same length, and the length of the center pin shaft 11 is the same as the total width of all the diagonal braces stacked together.

[0020] On the basis of the above scheme, the diagonal brace is made of steel plate, each of which has a pin hole at both ends, the diameter of the pin hole is the same as the diameter of the pin shaft, and all the diagonal braces each take one pin hole to align to form concentric circles, and then are connected together by the center pin shaft; all the diagonal braces are sorted, and the other pin holes of the odd-numbered diagonal braces are aligned to form concentric circles, which are connected together by the end pin shaft 1 3; the other pin holes of the even-numbered diagonal braces are aligned to form concentric circles, which are connected together by the end pin shaft 2 13, so that all the diagonal braces form two planes at angles to each other.

[0021] On the basis of the above scheme, the motor bottom plate is connected to the carriage bottom plate by bolts and screw holes, wherein the bolts are hexagon socket bolts, and the bolt diameter is the same as the screw hole diameter on the carriage bottom plate.

[0022] Beneficial effects: The present invention provides a new type of fixing device for railway transport crawler cargo. It has the following advantages:

[0023] 1. The device is small. The size of each part of the device is small, and it takes up very little space on the vehicle floor, which will not affect the loading volume and quantity of crawler cargo.

[0024] 2. Easy installation. The device has fewer parts and consists of only three parts. Each part is a regular part, which is very easy to install.

[0025] 3. Safe and reliable. All parts of this device are made of high-standard steel, and the quality is excellent. Each crawler cargo needs to be fixed with four fixing devices. By controlling the motor, the vehicle baffle bottom plate can be moved as a whole, which is convenient for close contact with the crawler cargo, making the loading and baffle closer, reducing the movement of the crawler cargo, and making the crawler cargo more firmly fixed. No other reinforcement methods are required, and the safety is high.

[0026] 4. Simple operation and high efficiency. The installation process of this device does not require many complicated process technologies, and the installation steps are few and simple, which improves the reinforcement efficiency of crawler cargo.

[0027] 5. Strong adaptability. This device can change the fixed position of the angle adjustment plate on the bottom plate of the vehicle block to change the angle of the vehicle block surface, and is suitable for reinforcement solutions for various types of crawler cargo.

[0028] 6. The diagonal brace can be folded for easy storage. The angle of the diagonal brace can be adjusted so it can be divided into the use state and the non-use state. When the device is not in use, the diagonal brace can be laid flat to reduce the space occupied by the equipment and facilitate storage.

[0029] 7. Multi-purpose. The device can not only reinforce tracked cargo, but also be used flexibly according to the characteristics of the cargo. When some wheeled cargo is loaded and reinforced, the angle of the baffle of the device can also be adjusted to make it suitable for loading and reinforcing some wheeled cargo.

[0030] 8. Low cost. The parts of the device have multiple same sizes, simple to make, low material cost, simple to install, less human resource consumption, saving a lot of manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0032] Figure 2 A top view of the device of the present invention;

[0033] Figure 3 is a side view of the device of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the vehicle block part;

[0035] Figure 5 This is a structural diagram of the motor part.

[0036] In the figure, 1 is the car bottom plate, 2 is the car fender bottom plate, 3 is the end pin shaft 1, 11 is the center pin shaft, 13 is the end pin shaft 2, 4 is the angle adjustment plate, 5 and 12 are diagonal braces, 6 is a bolt, 7 is a screw hole, 8 is a push rod, 9 is a motor, and 10 is a screw rod. DETAILED DESCRIPTION

[0037] In order to make the technical solution and beneficial effects of the present invention clearer, the following will be combined with the attached Figure 1-5 , the present invention is described in detail, clearly and completely. It should be noted that the examples described only represent a part of the application of the present invention, not all of the applications. Other example applications obtained by relevant personnel in this field without making innovative work are all within the scope of protection of the present invention. All technical and scientific terms proposed in this article have the same meaning as those commonly understood by ordinary technicians in the technical field to which this application belongs.

[0038] A railway transport crawler cargo fixing device with adjustable angle and longitudinal position comprises a vehicle stopper part and a motor part.

[0039] The car block part and the motor part are installed on the car floor 1. There are two rows of four screw holes on the car floor 1, two in one row, and the center lines of the two screw holes in each row are parallel to the long sides of the car floor. The four screw holes form a rectangle, and the four screw holes have the same diameter, which are used to fix the motor part to prevent the motor from moving.

[0040] The vehicle stopper part includes three pins, a plurality of diagonal braces, a vehicle stopper bottom plate 2, and an angle adjustment plate 4. The number of diagonal braces has no fixed value and can be set according to the actual use scenario.

[0041] In one embodiment, the vehicle stopper part includes three pins, nine diagonal braces, a vehicle stopper bottom plate 2 , an angle adjustment plate 4 and two bolts 6 .

[0042] The three pins are steel cylinders with the same diameter. Two of them are end pin 1 3 and end pin 2 13, which are respectively located on the vehicle guard bottom plate 2 and the angle adjustment plate 4 and have the same length, and are both equal to the wide side of the vehicle guard bottom plate 2; the other is a center pin 11, whose length is the same as the total width of the nine diagonal braces stacked together, and is used to connect the nine diagonal braces; the relative positions of the pins and the diagonal braces are determined, but the diagonal braces can rotate relative to the pins, so that the angle of the diagonal braces can be adjusted.

[0043] The diagonal braces are made of steel plates, each of which has a pin hole at both ends, and the diameter of the pin hole is the same as the diameter of the pin shaft. Nine diagonal braces each take a pin hole to align to form concentric circles, and then are connected together by a central pin shaft; the nine diagonal braces are sorted, and the other pin holes of the first, third, fifth, seventh, and ninth diagonal braces 5 of the odd number are aligned to form concentric circles, and are connected together by an end pin shaft; the other pin holes of the second, fourth, sixth, and eighth diagonal braces 12 of the even number are aligned to form concentric circles, and are connected together by another end pin shaft; at this time, the nine diagonal braces form two planes at an angle to each other. The above is only a specific embodiment of the present invention. In other embodiments, the number of diagonal braces can be set as needed, and the number of diagonal braces connected by end pin shaft one and the number of diagonal braces connected by end pin shaft two can be equal or unequal.

[0044] The vehicle fender bottom plate 2 is made of steel plate and is located on the vehicle bottom plate. Two rows of small screw holes are arranged in parallel on one end of the vehicle fender bottom plate 2 contacting the push rod 8 for fixing the angle adjustment plate 4. The diameters of all the small screw holes are the same. The center lines of the two rows of small screw holes are parallel to each other and to the long sides of the vehicle fender bottom plate. The spacing between each row of small screw holes is small, so that the diagonal brace can adjust more angles. The other end of the vehicle fender bottom plate 2 is provided with two small columns protruding perpendicular to the vehicle fender bottom plate 2, located at two vertex positions, and a pin hole is respectively provided on the protruding small columns, and the diameter of the pin hole is the same as the diameter of the end pin shaft 3. The five pin holes aligned with the five odd diagonal braces and the pin holes on the small columns form concentric circles and are connected by the end pin shaft 3.

[0045] The angle adjustment plate 4 is located on the vehicle fender bottom plate 2, and there are two screw holes in the middle of the plate, and the spacing between them is the same as the spacing between the two rows of small screw holes on the vehicle fender bottom plate. The center line is parallel to the long side of the angle adjustment plate, and the angle adjustment plate 4 is installed on the vehicle fender bottom plate 2 through bolts 6, screw holes and small screw holes; one end of the angle adjustment plate 4 has two small columns protruding perpendicular to the vehicle fender bottom plate, located at two vertex positions, and there is a pin hole on the protruding small columns respectively, and the diameter of the pin hole is the same as the diameter of the end pin shaft 13, and the four pin holes aligned with the four even-numbered diagonal braces and the pin holes on the small columns form concentric circles and are connected by the end pin shaft 13.

[0046] The bolt 6 is a hexagon socket bolt, the bolt diameter is the same as the diameter of the screw hole on the angle adjustment plate 4, and the bolt length is the sum of the thickness of the vehicle fender bottom plate 2 and the angle adjustment plate 4.

[0047] The motor part comprises a push rod 8, a motor 9 and a screw rod 10. The motor 9 is mounted on one end of the carriage bottom plate 1 through a motor bottom plate.

[0048] The push rod 8 consists of a cross bar and two screw barrels. The cross bar is a rectangular parallelepiped with the same length as the width of the car block bottom plate 2. It is located on the car body bottom plate 1. One side of the cross bar is in contact with the end of the car block bottom plate 2 with a screw hole, and the other side of the cross bar is connected to two screw barrels perpendicular to the cross bar. The two screw barrels are the same length and have the same thread, which are used to push the car block part to move.

[0049] The two screw barrels and the motor bottom plate are both provided with screw holes. The diameter of the two screws 10 is the same as the diameter of the screw holes. One end of the two screws 10 is screwed into the screw barrels respectively, and the other end is screwed into the screw holes of the motor bottom plate respectively.

[0050] The motor bottom plate is provided with four screw holes, the relative positions of the four screw holes are the same as the positions of the four screw holes on the carriage bottom plate 1, and the diameters of the screw holes are the same as the diameters of the screw holes on the carriage bottom plate.

[0051] The motor bottom plate is connected to the carriage bottom plate 1 by bolts. The bolts are hexagon socket bolts. The bolt diameter is the same as the screw hole diameter on the carriage bottom plate 1. The bolt length is the sum of the thickness of the motor bottom plate and the carriage bottom plate 1.

[0052] When in use, first determine the length, width and inclination angle of the lower surface of the track according to the specifications of the tracked cargo, and then determine the specific positions of the four devices placed on the outside of the two ends of the contact surface between the track and the car floor according to the length, width and size of the lower surface of the track. Then load the two devices at the front end of the crawler cargo first, fix the motor part on the car floor 1, and place the car barrier bottom plate 2 on the car floor 1 close to the push rod 8; connect one pin hole of the nine diagonal struts 5 and 12 together through the center pin 11, and then connect the other pin holes of the odd-numbered five diagonal struts 5 to the car barrier bottom plate 2 through the end pin 1 3, and connect the other pin holes of the even-numbered four diagonal struts 12 to the angle adjustment plate 4 through the end pin 2 13, and then adjust the angle of the diagonal strut 5 by moving the angle adjustment plate 4 according to the angle of the crawler of the crawler cargo, so that the angle of the diagonal strut 5 is the same as the angle of the crawler, and after determining the angle, fix the angle adjustment plate 4 to the car barrier bottom plate 2 by bolts 6; put the crawler cargo on the car floor 1, so that the crawler fits on the diagonal strut 5. If the crawler and the diagonal strut 5 are not tightly fitted, the push rod 8 can be driven by the motor 9 to adjust the position of the car barrier bottom plate 2 so that the crawler and the diagonal strut 5 fit tightly. Finally, two devices are loaded at the rear end of the crawler-type cargo, and the specific method is the same as above. At this moment, the crawler-type cargo is firmly fixed on the railway vehicle by four fixing devices.

[0053] Working principle: Manually adjust the angle of the diagonal brace. When the railway is loaded with crawler cargo, adjust the position of the angle adjustment plate 4 according to the inclination angle of the crawler cargo, so that the angle of the diagonal brace 5 matches the angle of the crawler; automatically adjust the position of the diagonal brace, and press the crawler cargo onto the car floor 1 so that it is in close contact with the diagonal brace 5; if the contact is not close and needs to be adjusted, the motor 9 can drive the push rod 8 to push the car bottom plate 2 to move, so that the diagonal brace 5 fits the crawler.

Claims

1. A railway transport crawler cargo fixing device with adjustable angle and longitudinal position, characterized in that: include: The vehicle block part and the motor part are installed on the bottom plate of the vehicle compartment, and the position of the motor part on the bottom plate of the vehicle compartment is fixed and cannot be moved; The motor part is used to push the vehicle block part to move; The vehicle block part comprises an end pin shaft 1 (3), an end pin shaft 2 (13), a center pin shaft (11), a plurality of diagonal braces, a vehicle block bottom plate (2) and an angle adjustment plate (4); the vehicle block bottom plate (2) is placed on the vehicle compartment bottom plate in close contact with the motor part, the angle adjustment plate (4) is installed above one end of the vehicle block bottom plate (2) in close contact with the motor part, and the position of the angle adjustment plate (4) on the vehicle block bottom plate (2) is adjustable in the moving direction of the vehicle block bottom plate (2); the end pin shaft 2 (13) is installed on the angle adjustment plate (4), and the end pin shaft 1 (3) is installed on the vehicle compartment bottom plate The end of the vehicle barrier bottom plate (2) away from the motor part is mounted; the axes of the end pin shaft 1 (3), the end pin shaft 2 (13) and the center pin shaft (11) are perpendicular to the movement direction of the vehicle barrier bottom plate (2); a plurality of diagonal braces are divided into two groups, one end of one group of diagonal braces is connected by the end pin shaft 1 (3), and one end of the other group of diagonal braces is connected by the end pin shaft 2 (13), and the other ends of the two groups of diagonal braces are connected by the center pin shaft, and the diagonal braces can rotate relative to the pin shaft, so that the angle between the two groups of diagonal braces can be changed according to the installation position of the angle adjustment plate (4) on the vehicle barrier bottom plate (2); The end of the vehicle guard bottom plate (2) away from the push rod (8) is provided with two small columns protruding perpendicular to the vehicle guard bottom plate (2) and located at two vertex positions. A pin hole is respectively provided on the protruding small columns. The diameter of the pin hole is the same as the diameter of the end pin shaft (3) and is used to install the end pin shaft (3); One end of the angle adjustment plate (4) is provided with two small columns protruding perpendicular to the bottom plate of the vehicle guardrail and located at two vertex positions. The protruding small columns are respectively provided with a pin hole, the diameter of the pin hole being the same as the diameter of the second end pin shaft (13) for installing the second end pin shaft (13).

2. The angle and position longitudinally adjustable tracked cargo securing device for railway transportation as claimed in claim 1, characterized in that: The motor part comprises a push rod (8), a motor (9) and a screw rod (10); the motor (9) is mounted on the carriage bottom plate via a motor bottom plate; the push rod (8) is connected to the motor bottom plate via the screw rod (10); the car stop bottom plate (2) is placed close to the push rod (8) on the carriage bottom plate; the motor (9) pushes the car stop part to move via the push rod (8).

3. The angle and position longitudinally adjustable tracked cargo securing device for railway transportation as claimed in claim 2, characterized in that: Two rows of small screw holes are arranged in parallel at one end of the vehicle fender bottom plate (2) contacting the push rod (8), and the angle adjustment plate (4) is mounted on the vehicle fender bottom plate (2) through bolts and the small screw holes.

4. The angle and position longitudinally adjustable tracked cargo securing device for railway transportation as claimed in claim 3, characterized in that: The vehicle fender bottom plate (2) is made of a steel plate, all the small screw holes have the same diameter, and the center lines of the two rows of small screw holes are parallel to each other and parallel to the long side of the vehicle fender bottom plate; the angle adjustment plate (4) is provided with two screw holes, the spacing between which is the same as the spacing between the two rows of small screw holes on the vehicle fender bottom plate, and the angle adjustment plate (4) is installed on the vehicle fender bottom plate (2) through bolts, screw holes and small screw holes.

5. The angle and position longitudinally adjustable tracked cargo securing device for railway transportation as claimed in claim 2, characterized in that: The push rod (8) is composed of a cross bar and two screw barrels. One side of the cross bar is in contact with the vehicle barrier bottom plate (2), and the other side of the cross bar is connected to two screw barrels perpendicular to the cross bar. The two screw barrels have the same length. The two screw barrels and the motor bottom plate are both provided with screw holes. One end of the two screws (10) is respectively screwed into the screw barrel, and the other end is respectively screwed into the screw hole of the motor bottom plate.

6. The angle and position longitudinally adjustable tracked cargo securing device for railway transportation as claimed in claim 1, characterized in that: The center pin shaft (11), the end pin shaft 1 (3) and the end pin shaft 2 (13) are steel cylinders.

7. The angle and position longitudinally adjustable tracked cargo securing device for railway transportation as claimed in claim 1, characterized in that: The diagonal braces are made of steel plates, each having a pin hole at both ends, the diameter of the pin hole being the same as the diameter of the pin shaft, and all the diagonal braces have one pin hole each aligned to form concentric circles, which are then connected together by a center pin shaft; all the diagonal braces are sorted, and the other pin holes of the odd-numbered diagonal braces are aligned to form concentric circles, which are then connected together by end pin shaft one (3); the other pin holes of the even-numbered diagonal braces are aligned to form concentric circles, which are then connected together by end pin shaft two (13), so that the two groups of diagonal braces form two planes at angles to each other.

8. The angle and position longitudinally adjustable tracked cargo securing device for railway transportation as claimed in claim 1, characterized in that: The motor bottom plate is connected to the carriage bottom plate through bolts and screw holes. The bolts are hexagon socket bolts, and the bolt diameter is the same as the screw hole diameter on the carriage bottom plate.

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