Guide groove device for preventing bar from jumping

Abstract

The utility model discloses a guide groove device for preventing a bar from jumping, which relates to the field of steel rolling equipment, and comprises a frame body comprising vertical plates arranged on two sides, a vertical roller structure arranged on the vertical plate on each side, and vertical rollers arranged along the vertical direction; the pinch roll structures are arranged in the middles of the vertical plates respectively, and each pinch roll structure comprises an upper pinch roll and a lower pinch roll which are arranged in the horizontal direction; when a bar passes through the guide groove device, the vertical face of the bar is attached to the vertical roller in a rolling mode, and the top face and the bottom face of the bar are attached to the upper pinch roller and the lower pinch roller in a rolling mode respectively. The guide groove device comprises the upper pinch roll and the lower pinch roll which are adjustable in position, so that bars can be prevented from jumping in the rolling process, and the phenomenon that steel collides with the guide and guard device at the inlet of the rolling mill is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of steel rolling equipment, and more specifically relates to a guide groove device for preventing bar material from jumping. Background Art

[0002] As the most widely used small mill in today's metallurgical steel rolling system, the short stress mill has the advantages of short stress line and high rigidity. With the rapid development of the global manufacturing industry, it is an important task of today's mill equipment design to strive to improve the rolling accuracy of the short stress mill to meet the precision requirements of the manufacturing industry for steel. In order to prevent the hot-rolled steel from being deflected when entering the mill, guides are installed at the entrance of the bite roll and guide grooves are installed between each mill. The guide refers to the device installed before and after the roll hole during the steel rolling process to help the rolled piece enter and exit the roll hole accurately and stably in the established direction and state. However, the guide has a certain width, and the contact surface between the steel and the guide produces sliding friction, which easily leads to scratches on the steel surface. The guide plays the role of transition between the various mills, especially when the steel bites into the first mill. It plays a key role.

[0003] The existing solution is that the guide grooves between each rolling mill are as follows Figure 1 , 2 As shown in Figures 3 and 4, the guide groove device is a welded frame installed between each rolling mill. The guide groove is an important component in the rolling mill, which is used to guide the movement of the rolled piece and affects the stability and quality of the rolling process. Its functions are: 1. To guide the contour trajectory of the rolled piece in the rolling mill to ensure the normal rolling of the rolled piece. 2. To position and support the rolled metal to prevent deviation and dislocation during rolling. 3. To adjust the spacing and position of the rolling mill rollers to ensure normal compression and deformation of the rolled piece. 4. To improve the cooling and lubrication conditions during the rolling process and improve the surface quality and mechanical properties of the rolled piece. A vertical roller device is designed to prevent the steel from directly contacting the side of the guide groove, causing scratches on the steel.

[0004] Although the guide groove device has vertical rollers that can prevent scratches to a certain extent, it still has the following disadvantages: 1. Although it is designed with vertical rollers, there is a lot of iron oxide scale in the working position and working environment. The accumulation of iron oxide scale and erosion by cooling water can easily cause the vertical rollers to get stuck; 2. Although the guide groove plays a transitional role between the various rolling mills, the steel may jump when passing through the guide groove and during the rolling process, which can easily cause the steel to collide with the guide guard at the entrance of the rolling mill, resulting in steel piling accidents. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies in the prior art and provide a guide groove device for preventing rods from jumping. The guide groove device comprises an upper pinch roller and a lower pinch roller with adjustable positions, which can prevent the rods from jumping during the rolling process and avoid the phenomenon of steel colliding with the guide guard at the entrance of the rolling mill.

[0006] In order to achieve the above object, the utility model provides a guide groove device for preventing the bar from jumping, comprising:

[0007] The frame includes vertical plates arranged on both sides, and a vertical roller structure is arranged on each vertical plate, and the vertical roller structure includes vertical rollers arranged in a vertical direction;

[0008] A pinch roller structure is respectively arranged at the middle of the vertical plate, and the pinch roller structure comprises an upper pinch roller and a lower pinch roller movably arranged in a horizontal direction;

[0009] When the bar passes through the guide groove device, the vertical surface of the bar rolls in contact with the vertical roller, and the top surface and bottom surface of the bar roll in contact with the upper pinch roller and the lower pinch roller respectively.

[0010] Optionally, the frame includes a base plate, and the first support and the second support are respectively provided at both ends of the lower surface of the base plate, and the first U-shaped groove and the second U-shaped groove are respectively connected to the two ends of the clamping roller structure.

[0011] Optionally, the vertical portions of the first U-shaped groove and the second U-shaped groove are the vertical plates, the first U-shaped groove is connected to the second U-shaped groove via a connecting plate, and a square hole is formed on the connecting plate.

[0012] Optionally, the vertical roller structure includes:

[0013] A pin shaft is inserted on the vertical plate, and the upper end of the vertical roller is sleeved on the pin shaft through a vertical sleeve;

[0014] The support shaft is arranged on the vertical plate, the lower end of the pin shaft is inserted into the support shaft, the lower end of the vertical roller is connected to the pin shaft through a bearing, and the top of the support shaft extends to the inside of the vertical roller.

[0015] Optionally, the support shaft and the vertical roller are clearance-fitted, and a refueling hole and an oil outlet hole are respectively provided on the top and the middle of the pin shaft, and the oil outlet hole corresponds to the bearing.

[0016] Optionally, the bearing is a thrust ball bearing.

[0017] Optionally, a lubrication cavity is formed between the inner periphery of the vertical roller and the outer periphery of the pin shaft.

[0018] Optionally, the pinch roller structure comprises:

[0019] Two upper support seats are respectively arranged on the vertical plates at both sides, and the upper pinch roller is connected to the upper support seats through an upper pin shaft;

[0020] Two lower support seats are respectively arranged on the vertical plates at both sides, and the lower pinch roller is connected to the lower support seats through a lower pin shaft;

[0021] A plurality of long waist holes are arranged on the vertical plate in a vertical direction, and two ends of the upper support seat and two ends of the lower support seat are slidably connected with the long waist holes.

[0022] Optionally, the upper pin shaft and the lower pin shaft are connected to the upper pinch roller and the lower pinch roller via transverse sleeves.

[0023] Optionally, bolts are provided through the bottom of the frame from bottom to top, and ends of the bolts abut against the lower support seat.

[0024] The utility model provides a guide groove device for preventing bar material from jumping, and its beneficial effects are:

[0025] 1. The guide groove device is equipped with a thrust bearing and a vertical lubrication cavity in the vertical roller structure, which can avoid the accumulation of iron oxide scale and cause the vertical roller to lock, and is convenient for providing lubrication for the bearing rolling elements;

[0026] 2. The guide groove device is installed in the pinch roller structure, and the height of the upper and lower pinch rollers can be adjusted through the long waist hole, so that the occurrence of failures can be avoided during the production process and the pinch rollers can be adjusted and replaced conveniently after wear.

[0027] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0029] Figure 1 A structural schematic diagram of an existing guide groove device is shown.

[0030] Figure 2 Shows Figure 1 Left view of .

[0031] Figure 3 Shows Figure 1 Top view of the .

[0032] Figure 4 Shows Figure 1 Stereoscopic diagram.

[0033] Figure 5 A schematic structural diagram of a guide groove device for preventing a bar from jumping according to an embodiment of the utility model is shown.

[0034] Figure 6 Shows Figure 5 Top view of the .

[0035] Figure 7 The schematic structural diagram of the vertical roller structure according to one embodiment of the utility model is shown.

[0036] Figure 8 A schematic structural diagram of a pinch roller structure according to an embodiment of the utility model is shown.

[0037] Fig. 9 A side cross-sectional view of a pinch roller structure according to an embodiment of the utility model is shown.

[0038] Description of reference numerals:

[0039] 1. Vertical roller structure; 2. Pinch roller structure; 3. Vertical roller; 4. Upper pinch roller; 5. Lower pinch roller; 6. Bottom plate; 7. First support; 8. Second support; 9. First U-shaped groove; 10. Second U-shaped groove; 11. Connecting plate; 12. Square hole; 13. Pin; 14. Vertical sleeve; 15. Support shaft; 16. Bearing; 17. Upper support seat; 18. Upper pin; 19. Lower support seat; 20. Lower pin; 21. Bolt; 22. Long waist hole; 23. Horizontal sleeve. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0041] The utility model provides a guide groove device for preventing a bar from jumping, comprising:

[0042] The frame includes vertical plates arranged on both sides, and a vertical roller structure is arranged on each side of the vertical plate, and the vertical roller structure includes vertical rollers arranged in the vertical direction;

[0043] The pinch roller structure is respectively arranged at the middle of the vertical plate, and the pinch roller structure comprises an upper pinch roller and a lower pinch roller movably arranged in the horizontal direction;

[0044] When the bar passes through the guide groove device, the vertical surface of the bar rolls and fits with the vertical roller, and the top surface and bottom surface of the bar roll and fit with the upper pinch roller and the lower pinch roller respectively.

[0045] Specifically, the guide groove device is disconnected at the middle of the vertical plates on both sides of the frame, and the pinch roller structure is placed at the position where the vertical plates are disconnected. When a bar passes through the guide groove device, it can pass through the vertical roller at one end, and the two vertical outer surfaces of the bar fit with the vertical roller. During the rotation of the vertical roller, the bar passes between the two vertical rollers, which can prevent the bar from deviation and dislocation during the rolling process; then the bar passes through the pinch roller structure, and the upper and lower horizontal outer surfaces of the bar fit with the upper and lower pinch rollers. During the rotation of the upper and lower pinch rollers, the bar passes between the two pinch rollers, which can prevent the bar from jumping during the rolling process; finally, the bar passes between the vertical rollers at the other end of the bar, and the vertical rollers can also limit the movement trajectory of the bar. In the guide groove device, the vertical roller and the upper and lower pinch rollers can guide the moving trajectory of the rod to prevent the rod from contacting the inner surface of the frame, and the upper and lower pinch rollers can be adjusted in height. In this way, when the pinch rollers are worn, the distance between the two pinch rollers can be adjusted to compensate for the wear, and the distance between the two pinch rollers can be adjusted to ensure that the rod will not be squeezed and deformed.

[0046] Optionally, the frame includes a base plate, a first support and a second support are respectively provided at both ends of the lower surface of the base plate, a first U-shaped groove and a second U-shaped groove are respectively provided on the upper surface of the base plate, and the first U-shaped groove and the second U-shaped groove are respectively connected to the two ends of the clamping roller structure.

[0047] Specifically, the bottom of the frame is a base plate, which is supported by a first support and a second support. The heights of the two supports can be set to different heights or the same height, which can be determined according to the position of the guide groove device. Two U-shaped grooves are respectively provided at both ends of the upper surface of the base plate, and a pinch roller structure is installed on the base plate between the two U-shaped grooves. The vertical surfaces of the two U-shaped grooves are the vertical plates. The vertical rollers provided on the vertical plates can limit the horizontal movement trajectory of the rods, and the upper and lower pinch rollers in the pinch roller structure can limit the vertical movement trajectory of the rods. In this way, the movement trajectory of the rods is fully limited to ensure that the rods will not be misplaced.

[0048] Optionally, the vertical portions of the first U-shaped groove and the second U-shaped groove are vertical plates, and the first U-shaped groove is connected to the second U-shaped groove via a connecting plate, and a square hole is formed on the connecting plate.

[0049] Specifically, in order to ensure the overall strength of the two U-grooves on the frame, a connecting plate is provided between the two U-grooves, so that the two U-grooves are connected into a whole, thereby preventing the frame from being deformed during lifting due to the fact that the vertical plates on both sides are not directly connected; the connecting plate is also located just above the pinch roller structure, and a square hole is opened on the connecting plate to avoid the problem of interference between the upper pinch roller and the connecting plate when the upper pinch roller is adjusted to the top; the connecting plate is bolted to the top of the vertical surface of the U-groove. When the upper and lower pinch rollers need to be replaced or repaired, they can be replaced by removing the connecting plate.

[0050] Optionally, the vertical roller structure includes:

[0051] The pin shaft is inserted on the vertical plate, and the upper end of the vertical roller is sleeved on the pin shaft through a vertical shaft sleeve;

[0052] The support shaft is arranged on the vertical plate, the lower end of the pin shaft is inserted into the support shaft, the lower end of the vertical roller is connected with the pin shaft through a bearing, and the top of the support shaft extends to the inside of the vertical roller.

[0053] Specifically, the vertical roller structures are respectively arranged at both ends of the pinch roller structure, with two vertical rollers arranged on two vertical plates at one end, and the other two vertical rollers arranged on two vertical plates at the other end, and each vertical roller is fixed in the same way; the vertical roller is fixed to the vertical plate through a pin shaft, and the top and bottom ends of the pin shaft are respectively inserted and fixed on the vertical plate, the vertical roller sleeve is arranged on the outer periphery of the middle section of the pin shaft, and a vertical shaft sleeve is arranged at the upper end of the vertical roller, and a bearing is arranged at the lower end of the vertical roller, so that the vertical roller can stably rotate around the axis of the pin shaft; because a support shaft is arranged below the bearing, the bearing is completely wrapped by the vertical roller, and the vertical roller does not contact the bottom of the U-shaped groove, so that the bearing and the vertical roller can be protected.

[0054] Optionally, the support shaft and the vertical roller are clearance-fitted, and a refueling hole and an oil outlet hole are respectively provided on the top and the middle of the pin shaft, and the oil outlet hole corresponds to the bearing.

[0055] Optionally, the bearing is a thrust ball bearing.

[0056] Optionally, a lubrication cavity is formed between the inner periphery of the vertical roller and the outer periphery of the pin shaft.

[0057] Specifically, if the bearing adopts deep groove ball bearing or other types of bearings, the upper bearing cannot be well lubricated, and the lower bearing is fully lubricated, so the upper bearing is damaged. Therefore, the bearing below the vertical roller is set as a thrust ball bearing, a vertical lubrication cavity is formed between the vertical roller and the pin shaft, and the support shaft and the vertical roller are matched with clearance to ensure that the thrust ball bearing has sufficient clearance, so that all the oil in the lubrication cavity is used for the thrust ball bearing. In addition, a refueling port and an oil outlet are opened on the pin shaft, and the oil discharged from the oil outlet corresponds to the rolling element of the thrust ball bearing, which can directly deliver the lubricating oil to the thrust ball bearing, thereby ensuring that the rolling element can use sufficient fresh lubricating oil at the first time; if manual lubrication is used, if the lubricating oil in the vertical roller is carbonized or powdered during refueling, it can be discharged through the clearance between the support shaft and the vertical roller, so that it flows into the support shaft part. Since the thrust ball bearing is hidden inside the vertical roller, it can avoid the accumulation of a mixture of iron oxide and water on the frame, and avoid the occurrence of blockage or jamming when the vertical roller rotates.

[0058] Optionally, the pinch roller structure comprises:

[0059] Two upper support seats are respectively arranged on the vertical plates at both sides, and the upper pinch roller is connected to the upper support seats through an upper pin shaft;

[0060] Two lower support seats are respectively arranged on the vertical plates at both sides, and the lower pinch roller is connected to the lower support seats through the lower pin shaft;

[0061] A plurality of long waist holes are arranged on the vertical plate in a vertical direction, and two ends of the upper support seat and two ends of the lower support seat are slidably connected with the long waist holes.

[0062] Specifically, in the pinch roller structure, the upper and lower pinch rollers are connected to the end of the vertical plate through a support seat and a pin shaft, and a long waist hole is correspondingly provided at the end of the vertical plate, so that the positions of the upper and lower pinch rollers can be moved up and down along the long waist hole; when the pinch rollers are worn, the distance between the upper and lower pinch rollers can be reduced to prevent the bar from shaking up and down; when the steel passing through the guide groove device is extruded and deformed, the distance between the upper and lower pinch rollers can be increased.

[0063] Optionally, the upper pin shaft and the lower pin shaft are connected to the upper pinch roller and the lower pinch roller via a transverse bushing.

[0064] Specifically, a transverse sleeve is arranged between the outer periphery of the upper and lower pin shafts and the inner periphery of the upper and lower pinch rollers, so that when a bar passes between the pinch rollers, the upper and lower pinch rollers can rotate normally to ensure the smooth passage of the bar and limit the movement trajectory of the bar.

[0065] Optionally, bolts are provided through the bottom of the frame from bottom to top, and ends of the bolts abut against the lower support seat.

[0066] Specifically, bolts are arranged on the bottom plate of the frame. When the lower pinch roller needs to be adjusted, first loosen the connecting bolts between the lower pin shaft and the long waist hole, and then tighten the bolts so that the top of the bolts can support the lower support seat to move up and down. When the lower pinch roller moves to the set height, just lock the lower pin shaft and the long oval hole. In this way, in addition to limiting the position of the long oval hole to the lower pinch roller, the bolts on the bottom plate can also support and limit the lower pinch roller to prevent axial transmission of the lower pinch roller.

[0067] In one embodiment, bolts can also be set on the connecting plate. When the upper pinch roller needs to be adjusted, first loosen the connecting bolts between the upper pin shaft and the long waist hole, and then screw the spiral so that the bottom of the bolt can move against the upper support seat. When the upper pinch roller moves to the set height, the upper pin shaft and the long round hole can be locked. In this way, the upper pinch roller can be doubly locked by the upper pin shaft and the bolts on the connecting plate to ensure the stable positioning of the upper pinch roller.

[0068] Example

[0069] like Figures 5 to 9 As shown, the utility model provides a guide groove device for preventing a bar from jumping, comprising:

[0070] The frame includes vertical plates arranged on both sides, and a vertical roller structure 1 is arranged on each side of the vertical plate, and the vertical roller structure 1 includes vertical rollers 3 arranged in the vertical direction;

[0071] The pinch roller structure 2 is respectively arranged at the middle of the vertical plate, and the pinch roller structure 2 comprises an upper pinch roller 4 and a lower pinch roller 5 movably arranged in the horizontal direction;

[0072] When the bar passes through the guide groove device, the vertical surface of the bar rolls and fits with the vertical roller 3, and the top surface and bottom surface of the bar rolls and fits with the upper pinch roller 4 and the lower pinch roller 5 respectively.

[0073] In this embodiment, the frame includes a base plate 6, and the first support 7 and the second support 8 are respectively provided at both ends of the lower surface of the base plate, and the upper surface of the base plate 6 is provided with a first U-shaped groove 9 and a second U-shaped groove 10, and the first U-shaped groove 9 and the second U-shaped groove 10 are respectively connected to the two ends of the clamping roller structure 2.

[0074] In this embodiment, the vertical portions of the first U-shaped groove 9 and the second U-shaped groove 10 are vertical plates. The first U-shaped groove 9 is connected to the second U-shaped groove 10 via a connecting plate 11 , and a square hole 12 is formed on the connecting plate 11 .

[0075] In this embodiment, the vertical roller structure 1 includes:

[0076] The pin shaft 13 is inserted on the vertical plate, and the upper end of the vertical roller 3 is sleeved on the pin shaft 13 through a vertical sleeve 14;

[0077] The support shaft 15 is arranged on the vertical plate, the lower end of the pin shaft 13 is inserted into the support shaft 15 , the lower end of the vertical roller 3 is connected to the pin shaft 13 through a bearing 16 , and the top of the support shaft 15 extends to the inside of the vertical roller 3 .

[0078] In this embodiment, the support shaft 15 and the vertical roller 3 are clearance-fitted, and the top and the middle of the pin shaft 13 are respectively provided with a refueling hole and an oil outlet hole, and the oil outlet hole corresponds to the bearing 16 .

[0079] In this embodiment, the bearing 16 is a thrust ball bearing.

[0080] In this embodiment, a lubrication cavity is formed between the inner periphery of the vertical roller 3 and the outer periphery of the pin shaft 13 .

[0081] In this embodiment, the pinch roller structure 2 comprises:

[0082] Two upper support seats 17 are respectively arranged on the vertical plates at both sides, and the upper pinch roller 4 is connected to the upper support seats 17 through an upper pin shaft 18;

[0083] Two lower support seats 19 are respectively arranged on the vertical plates at both sides, and the lower pinch roller 5 is connected to the lower support seats 19 through the lower pin shaft 20;

[0084] A plurality of long waist holes 22 are provided on the vertical plate in the vertical direction, and both ends of the upper support seat 17 and both ends of the lower support seat 19 are slidably connected to the long waist holes 22 .

[0085] In this embodiment, the upper pin shaft 18 and the lower pin shaft 20 are connected to the upper pinch roller 4 and the lower pinch roller 5 via a transverse sleeve 23 .

[0086] In this embodiment, a bolt 21 is provided through the bottom of the frame from bottom to top, and the end of the bolt 21 abuts against the lower support seat 19 .

[0087] In summary, the guide groove device is provided with a vertical roller structure 1 and a pinch roller structure 2 on the frame, wherein four vertical rollers 3 are provided, which are respectively provided at the two ends of the pinch roller structure 2, and one is provided on the vertical plate on each side, so that when the steel passes through the guide groove device, the left and right sides of the steel roll and fit with the vertical rollers 3; in addition, the pinch roller structure 2 is provided in the middle part of the frame, and the upper pinch roller 4 and the lower pinch roller 5 are used to achieve rolling fit with the upper and lower surfaces of the steel, which can avoid the jumping of the steel during the transmission process, and when the pinch roller is worn, the distance between the two pinch rollers can be reduced, so that the wear of the pinch rollers can be compensated.

[0088] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A guide groove device for preventing a bar from jumping, characterized in that: include: The frame body comprises vertical plates arranged on both sides, and a vertical roller structure is arranged on each vertical plate, and the vertical roller structure comprises vertical rollers arranged in a vertical direction; A pinch roller structure is respectively arranged at the middle of the vertical plate, and the pinch roller structure comprises an upper pinch roller and a lower pinch roller movably arranged in a horizontal direction; When the bar passes through the guide groove device, the vertical surface of the bar rolls in contact with the vertical roller, and the top surface and bottom surface of the bar roll in contact with the upper pinch roller and the lower pinch roller respectively.

2. The guide groove device for preventing the bar from jumping according to claim 1 is characterized in that: The frame includes a bottom plate, and the first and second supports are respectively arranged at both ends of the lower surface of the bottom plate, and the first and second U-shaped grooves are respectively arranged on the upper surface of the bottom plate, and the first U-shaped groove and the second U-shaped groove are respectively connected to the two ends of the clamping roller structure.

3. The guide groove device for preventing the bar from jumping according to claim 2 is characterized in that: The vertical portions of the first U-shaped groove and the second U-shaped groove are the vertical plates. The first U-shaped groove is connected to the second U-shaped groove via a connecting plate, and a square hole is formed on the connecting plate.

4. The guide groove device for preventing the bar from jumping according to claim 1 is characterized in that: The vertical roller structure comprises: A pin shaft is inserted on the vertical plate, and the upper end of the vertical roller is sleeved on the pin shaft through a vertical sleeve; The support shaft is arranged on the vertical plate, the lower end of the pin shaft is inserted into the support shaft, the lower end of the vertical roller is connected to the pin shaft through a bearing, and the top of the support shaft extends to the inside of the vertical roller.

5. The guide groove device for preventing the bar from jumping according to claim 4 is characterized in that: The support shaft and the vertical roller are clearance-matched, and the top and middle of the pin shaft are respectively provided with a refueling hole and an oil outlet hole, and the oil outlet hole corresponds to the bearing.

6. The guide groove device for preventing the bar from jumping according to claim 5 is characterized in that: The bearing is a thrust ball bearing.

7. The guide groove device for preventing the bar from jumping according to claim 6 is characterized in that: A lubrication cavity is formed between the inner periphery of the vertical roller and the outer periphery of the pin shaft.

8. The guide groove device for preventing bar jumping according to claim 1 is characterized in that: The pinch roller structure comprises: Two upper support seats are respectively arranged on the vertical plates at both sides, and the upper pinch roller is connected to the upper support seats through an upper pin shaft; Two lower support seats are respectively arranged on the vertical plates at both sides, and the lower pinch roller is connected to the lower support seats through a lower pin shaft; A plurality of long waist holes are arranged on the vertical plate in a vertical direction, and two ends of the upper support seat and two ends of the lower support seat are slidably connected with the long waist holes.

9. The guide groove device for preventing the bar from jumping according to claim 8, characterized in that: The upper pin shaft and the lower pin shaft are connected to the upper pinch roller and the lower pinch roller via transverse sleeves.

10. The guide groove device for preventing bar jumping according to claim 8, characterized in that: A bolt is provided through the bottom of the frame from bottom to top, and the end of the bolt abuts against the lower support seat.

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