A double-flow roll forming machine

Abstract

The present invention relates to a double-stream roll forming machine, belonging to the technical field of metallurgical equipment, and includes an upper roll and a lower roll respectively located on the upper and lower sides of the steel running line; the upper roll includes an upper transmission shaft supported at both ends on an upper support seat and two groups of upper forming sleeves sleeved on the upper transmission shaft; the lower roll includes a lower transmission shaft supported at both ends on a lower support seat and two groups of lower forming sleeves sleeved on the lower transmission shaft; the lower forming sleeves and the upper forming sleeves form a forming hole pattern; the upper support seat and / or the lower support seat is connected with a lifting device to adjust the distance between the two transmission shafts; the upper support seat and the lower support seat are also provided with a forming sleeve axial adjustment device to adjust the axial position of the forming hole pattern, and the forming sleeve axial adjustment device adopts a lead screw-nut transmission mechanism with double nuts and double helix directions to adjust the axial position of the forming sleeve; the convenient and intelligent adjustment of the forming hole pattern is realized, and the adjustment difficulty and adjustment duration are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgical equipment and relates to a double-stream roll forming machine. Background Art

[0002] At present, the equipment for adjusting the position pressure of the forming rolls in the cold forming of structural steel with a single-stream production is relatively simple. Through manual adjustment or mechanical adjustment, the product quality is poor, and the production efficiency and benefits are low. In hot bending forming, after the strip with a width of 800 - 5000 mm is hot-rolled, it is longitudinally split and directly roll-bent using the waste heat after rolling. In the prior art, in order to enable the same device to produce structural steel of different specifications or shapes, it is necessary to adjust and support the position of the forming sleeve of the forming machine. However, in the prior art, whether it is cold bending forming or hot bending forming equipment, the position pressure of the forming sleeve on the roll press is not convenient for on-line adjustment. For a double-stream roll forming machine, the adjustment difficulty is greater, and the downtime for replacing the forming sleeve is long, and there are many spare parts, resulting in an increase in production costs. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a double-stream roll forming machine to solve the problem that the position of the forming sleeve of the roll forming machine cannot be adjusted intelligently on-line.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A double-stream roll forming machine includes an upper roll and a lower roll respectively located on the upper and lower sides of the steel running line; the upper roll includes an upper transmission shaft supported at both ends on an upper support seat and two groups of upper forming sleeves sleeved on the upper transmission shaft; the lower roll includes a lower transmission shaft supported at both ends on a lower support seat and two groups of lower forming sleeves sleeved on the lower transmission shaft, and the two groups of lower forming sleeves and the two groups of upper forming sleeves form a double-stream forming pass; the upper support seat and the lower support seat are arranged on a frame, and the upper support seat and / or the lower support seat is connected with a lifting device so that it can be lifted relative to the frame; both the upper support seat and the lower support seat are provided with a forming sleeve axial adjustment device to adjust the axial position of the upper forming sleeve or the lower forming sleeve. The forming sleeve axial adjustment device includes two groups of screw-nut transmission mechanisms with double nuts and double helix directions, and the double nuts of one group of screw-nut transmission mechanisms are located in the middle of the corresponding two groups of forming sleeves, and the double nuts of the other group of screw-nut transmission mechanisms are located outside the corresponding two groups of forming sleeves, so as to drive the two forming sleeves to approach or move away from each other through the double nuts respectively.

[0006] Optionally, each group of screw-nut transmission mechanisms includes more than 2 screw-nut transmission mechanisms, and they are evenly distributed in the circumferential direction of the upper transmission shaft or the lower transmission shaft.

[0007] Optionally, moving bearing seats are provided on both sides of each set of upper forming sleeves and each set of lower forming sleeves to limit their axial positions. The moving bearing seats are connected to the nuts of the corresponding screw-nut transmission mechanisms to drive them to move axially along the upper transmission shaft or the lower transmission shaft through the nuts of the screw-nut transmission mechanisms.

[0008] Optionally, the moving bearing seat includes a moving bearing seat body capable of moving along the corresponding upper support seat or lower support seat and a bearing installed in the moving bearing seat body for supporting the upper transmission shaft or the lower transmission shaft. The inner ring of the bearing is fixedly connected to the forming sleeve, and the inner ring of the bearing and the forming sleeve can axially slide along the key provided on the corresponding transmission shaft. The moving bearing seat body is fixedly connected to the nut of the corresponding screw-nut transmission mechanism.

[0009] Optionally, it further includes a forming sleeve support device. The forming sleeve support device includes at least one lifting shaft arranged perpendicular to the upper transmission shaft or the lower transmission shaft. The lifting shaft is slidably connected to the machine frame. A driving device is provided at one end of the lifting shaft away from the upper transmission shaft or the lower transmission shaft to drive it to move axially along its axis, and the other end acts on the corresponding moving bearing seat or the corresponding forming sleeve.

[0010] Optionally, the lifting shaft acts on the corresponding forming sleeve through a double-roller support. The double-roller support is arranged at one end of the lifting shaft close to the upper transmission shaft or the lower transmission shaft and includes a connecting shaft arranged in a T shape with the lifting shaft. Roller sleeves rotatably connected to the connecting shaft are sleeved at both ends of the connecting shaft.

[0011] Optionally, the lifting shaft acts on the corresponding forming sleeve through a single-roller support. The single-roller support is arranged at one end of the lifting shaft close to the upper transmission shaft or the lower transmission shaft and includes a connecting block fixed at the end of the lifting shaft and having a concave groove on the side away from the lifting shaft. A connecting shaft arranged perpendicular to the lifting shaft and a roller sleeve rotatably connected to the connecting shaft are provided in the concave groove of the connecting block.

[0012] Optionally, the roller sleeve is a flat roller sleeve or a concave roller sleeve, and the roller sleeve is rotatably connected to the connecting shaft through a bearing.

[0013] Optionally, the lifting device is located at both ends of the upper roller or the lower roller, is installed on the machine frame, and the output end is connected to the corresponding upper support seat or lower support seat to enable the upper support seat or the lower support seat to lift along the vertical guiding groove provided on the machine frame.

[0014] Optionally, the lifting device is a hydraulic cylinder or a jack.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. By adopting a screw-nut transmission mechanism with double nuts and double thread directions to adjust the axial position of the forming sleeve, the structure is simple, the adjustment is convenient, the convenient and intelligent adjustment of the forming hole type is realized, and the adjustment difficulty and adjustment duration are reduced.

[0017] 2. By providing moving bearing seats on both sides of the forming sleeve to act with the nut of the lead screw nut drive mechanism, not only the axial position adjustment of the forming sleeve is achieved, but also the support of the transmission shaft is increased, which is beneficial to controlling the deformation of the transmission shaft.

[0018] 3. By providing a forming sleeve support device, not only can the fine adjustment of the distance between the transmission shafts be realized, but also the support rigidity is increased, and the radial pressure on the transmission shaft can be intelligently adjusted, which is convenient for improving the quality of the formed product.

[0019] Other advantages, objectives and features of the present invention will, to some extent, be described in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in preferred detail below in conjunction with the drawings, where:

[0021] Figure 1 is the front view of a double-stream roll forming machine of the present invention;

[0022] Figure 2 is Figure 1 the right view of;

[0023] Figure 3 is Figure 2 the J-J cross-sectional view of;

[0024] Figure 4 is Figure 2 the K-K cross-sectional view of;

[0025] Figure 5 is the structural schematic diagram of the forming sleeve support device Figure 1 (double flat roll support);

[0026] Figure 6 is the structural schematic diagram of the forming sleeve support device Figure 2 (double concave roll support);

[0027] Figure 7 is the structural schematic diagram of the forming sleeve support device Figure 3 (single roll support);

[0028] Figure 8 is Figure 1 the P-P cross-sectional view of (with vertical rolls);

[0029] Figure 9 is Figure 1P-P sectional view (without vertical rolls);

[0030] Figure 10 Schematic diagram for replacement of vertical roll integrated assembly;

[0031] Figure 11 Schematic structure of the forming sleeve support device Figure 4 (Supporting movable bearing block);

[0032] Figure 12 Layout schematic diagram of the forming sleeve support device (hybrid support of forming sleeve and movable bearing block).

[0033] Reference numerals: transmission shaft assembly 10, rotary drive 11, coupling 12, fixed bearing block 13, lead screw 14, first bearing 15, nut 16, movable bearing block 17, forming sleeve 18, transmission shaft 19, forming sleeve support device 20, drive device 21, lifting shaft 22, flat roll sleeve 23, second bearing 24, first connecting shaft 25, concave roll sleeve 26, frame 30, lifting device 40, transmission shaft axial positioning device 50, vertical roll assembly 60, sliding guide rod assembly 70, transmission device 80, vertical roll integrated assembly 90, external roll changing device 100. Detailed implementation manners

[0034] The following specific examples illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0035] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0036] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] Please refer to Figures 1 to 12 , a double-flow roll forming machine, which includes an upper roll and a lower roll respectively located on the upper and lower sides of the steel wire running line; the upper roll includes an upper transmission shaft supported at both ends on an upper support seat and two groups of upper forming sleeves sleeved on the upper transmission shaft, and each group of upper forming sleeves includes two relatively arranged upper forming sleeves; the lower roll includes a lower transmission shaft supported at both ends on a lower support seat and two groups of lower forming sleeves sleeved on the lower transmission shaft, and each group of lower forming sleeves includes two relatively arranged lower forming sleeves. The two groups of lower forming sleeves and the two groups of upper forming sleeves form a double-flow forming hole pattern; the upper support seat and the lower support seat are arranged on the frame 30, and the upper support seat and / or the lower support seat are connected with a lifting device 40 to enable it to lift relative to the frame 30; both the upper support seat and the lower support seat are provided with a forming sleeve axial adjustment device to adjust the axial position of the upper forming sleeve or the lower forming sleeve. The forming sleeve axial adjustment device includes two groups of lead screw nut transmission mechanisms with double nuts and double helix directions, and the double nuts of one group of lead screw nut transmission mechanisms are located in the middle of the corresponding two groups of forming sleeves, and the double nuts of the other group of lead screw nut transmission mechanisms are located outside the corresponding two groups of forming sleeves, so as to drive the two forming sleeves to approach or move away through the double nuts.

[0038] Optionally, each set of screw-nut transmission mechanisms includes more than 2 screw-nut transmission mechanisms, which are evenly distributed circumferentially on the upper transmission shaft or the lower transmission shaft; both sides of each set of upper forming sleeves and each set of lower forming sleeves are provided with moving bearing seats 17 to limit their axial positions. The moving bearing seats 17 are connected to the nuts 16 of the corresponding screw-nut transmission mechanisms to drive them to move axially along the upper transmission shaft or the lower transmission shaft through the nuts 16 of the screw-nut transmission mechanisms; the moving bearing seats 17 include a moving bearing seat body capable of moving along the corresponding upper support seat or lower support seat and a bearing installed in the moving bearing seat body for supporting the upper transmission shaft or the lower transmission shaft. The inner ring of the bearing is fixedly connected to the forming sleeve, and the inner ring of the bearing and the forming sleeve can axially slide along the key arranged on the corresponding transmission shaft. The moving bearing seat body is fixedly connected to the nut 16 of the corresponding screw-nut transmission mechanism; it also includes a forming sleeve support device. The forming sleeve support device includes at least one lifting shaft 22 arranged perpendicular to the upper transmission shaft or the lower transmission shaft. The lifting shaft 22 is slidably connected to the frame 30. A driving device is provided at one end of the lifting shaft 22 away from the upper transmission shaft or the lower transmission shaft to drive it to move axially along its axis, and the other end acts on the corresponding moving bearing seat 17 or the corresponding forming sleeve; the driving device can be a linear hydraulic cylinder or a screw-nut transmission mechanism driven by a motor, and is connected to the control system of the forming machine to realize intelligent adjustment of the transmission shaft pressure; the lifting shaft 22 can act on the corresponding forming sleeve through a double-roller support. The double-roller support is arranged at one end of the lifting shaft 22 close to the upper transmission shaft or the lower transmission shaft, and includes a first connecting shaft 25 arranged in a T shape with the lifting shaft 22. Roller sleeves rotatably connected to it are sleeved at both ends of the first connecting shaft 25; the lifting shaft 22 can also act on the corresponding forming sleeve 18 through a single-roller support. The single-roller support is arranged at one end of the lifting shaft 22 close to the upper transmission shaft or the lower transmission shaft, and includes a connecting block fixed at the end of the lifting shaft 22 and having a concave groove on the side away from the lifting shaft 22. A second connecting shaft arranged perpendicular to the lifting shaft 22 and a roller sleeve rotatably connected to the second connecting shaft are arranged in the concave groove of the connecting block; the roller sleeve is a flat roller sleeve 23 or a concave roller sleeve 26, and the roller sleeve is rotatably connected to the connecting shaft through a bearing; the lifting device 40 can be a hydraulic cylinder or a jack, which is located at both ends of the upper roller or the lower roller, is installed on the frame 30, and the output end is connected to the corresponding upper support seat or lower support seat to enable the upper support seat or the lower support seat to lift along the vertical guide groove arranged on the frame 30.

[0039] Embodiment

[0040] A double-roll pressing and forming device with a roller sleeve adjustment and support device, as Figures 1 to 12As shown in the figure, where A1 is the center distance of the frame (the center distance between the two bearing seats at both ends of the frame, a fixed value), A2 is the center distance between the two section steel channels T1 and T2 (adjustable and variable), and B1 is the center distance between the upper and lower transmission shafts (adjustable and variable). It mainly includes a transmission shaft assembly 10, a forming sleeve support device 20, a frame 30, a lifting device 40, a transmission shaft axial positioning device 50, a vertical roll assembly 60, a sliding guide rod assembly 70, a transmission device 80, a vertical roll integrated assembly 90, and an off-machine roll changing device 100. The specific structure is as follows:

[0041] Transmission shaft assembly 10: It includes connecting parts such as a rotary drive 11, a coupling 12, a fixed bearing seat 13, a lead screw 14, a first bearing 15, a left-handed / right-handed nut 16, a moving bearing seat 17, a forming sleeve 18, and a transmission shaft 19. The inner ring of the bearing in the moving bearing seat 17 on one side of the forming sleeve 18 is fixedly connected to the forming sleeve 18 and can axially slide along the key provided on the transmission shaft 19 together. The rotary drive 11 drives the lead screw 14 to rotate, driving the left-handed / right-handed nut 16, the moving bearing seat 17, and the forming sleeve 18 to approach or separate, realizing synchronous and symmetric position adjustment relative to the center line of the frame. The transmission shaft assembly 10 is used to adjust the axial position of the forming sleeve 18.

[0042] Forming sleeve support device 20: It includes connecting parts such as a drive device 21, a lifting shaft 22, a flat roll sleeve 23 (or a concave roll sleeve 26), a second bearing 24, and a connecting shaft 25. The flat roll sleeve 23 (or the concave roll sleeve 26) acts with the forming sleeve 18, and the forming sleeve 18 drives the flat roll sleeve 23 (or the concave roll sleeve 26) to axially move and rotate. The lifting shaft 22 can also directly act with the moving bearing seats 17 on both sides. The forming sleeve support device 20 is used to support the forming sleeve and improve the radial rigidity of the transmission shaft.

[0043] Frame 30: It includes a left frame (which can be integral or assembled), a right frame (which can be integral or assembled), an upper cross beam, a lower cross beam, and other connecting parts, serving as the installation foundation.

[0044] Lifting device 40: It can be a hydraulic cylinder or a jack, driving the upper and lower transmission shafts to move up and down to adjust the vertical position, which is used to conveniently adjust the vertical position of the upper and lower transmission shafts.

[0045] Transmission shaft axial positioning device 50. When replacing the transmission shaft assembly, it opens or locks the position of the transmission shaft so that the replacement device can push and pull the upper and lower transmission shafts in and out of the frame to achieve replacement.

[0046] Vertical roll assembly 60: It includes connecting parts such as a vertical roll sleeve, a bearing, a shaft, etc. When needed, the vertical roll is assembled to assist in forming the section steel. One end of the vertical roll shaft is fixedly connected to the moving bearing seat, and the other end is slidably connected to the moving bearing seat.

[0047] Sliding guide rod assembly 70: It includes connecting parts such as sliding rods; it is used for the synchronous positioning of the up-and-down movement of the bearing seat. The upper moving bearing seat is slidably connected to the sliding rod, and the lower moving bearing seat is fixedly connected to the sliding rod.

[0048] Drive shaft drive device 80: It is located on the left side (transmission side) of the frame and includes a motor, a reducer, a coupling, etc.; it is used to rotate the upper and lower drive shafts to roll and form profiled steel.

[0049] Vertical roll integrated assembly 90: It includes a frame, a vertical roll sleeve, bearings, shafts, frame positioning connecting parts, etc. For the vertical roll integrated assembly 90, with the use of an off-machine replacement tool, when producing profiled steel of different specifications, the vertical roll can be separately and integrally pushed and pulled in and out of the frame for replacement. The vertical roll is fixedly assembled with the frame as a whole, or separately assembled and placed on the frame for positioning, and is pushed and pulled in and out of the frame by an off-machine replacement device for replacement.

[0050] Off-machine roll changing device 100: It is located on the right side (operation side) of the frame and includes a push-pull driver, a support frame, a transverse movement device, a cross beam, etc.

[0051] In the present invention, a driving lead screw is arranged on the fixed bearing seat 13 to drive the movement of the moving bearing seat 17 in the middle, adjust the position of the moving bearing seat 17, and adjust the axial position of the profiled steel forming channel, so as to form profiled steel of different specifications by using waste heat; lifting drivers are arranged on both sides and up and down of the frame, and a support device for supporting the forming sleeve 18 is arranged in the middle of the drive shaft 19 to realize the control of the relative displacement in the radial direction of the drive shaft 19; furthermore, the adjustment of the profiled steel channel is completed, and the same device can produce structural steel of different specifications.

[0052] The present invention is a new technical solution developed for the waste heat forming equipment of hot-rolled medium and heavy plates and hot-rolled strip steel. The present invention realizes the adjustment of the profiled steel channel, and the same device can produce structural steel of different specifications. Compared with the existing structure, it has the advantages of simple adjustment and support structure, improved support rigidity, intuitive control effect, reduced equipment weight and cost, etc., and has the prospect of market promotion and implementation.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A double-stream roll forming machine, comprising an upper roll and a lower roll respectively located on the upper and lower sides of the steel wire running path; the upper roll includes an upper transmission shaft supported at both ends on an upper support seat and two groups of upper forming sleeves sleeved on the upper transmission shaft; the lower roll includes a lower transmission shaft supported at both ends on a lower support seat and two groups of lower forming sleeves sleeved on the lower transmission shaft, and the two groups of lower forming sleeves and the two groups of upper forming sleeves form a double-stream forming pass; the upper support seat and the lower support seat are arranged on a frame, and the upper support seat and / or the lower support seat is connected with a lifting device to enable it to lift relative to the frame; it is characterized in that: Axial adjustment devices for the forming sleeves are provided on both the upper support base and the lower support base to adjust the axial positions of the upper forming sleeve or the lower forming sleeve. The axial adjustment device for the forming sleeve includes two sets of lead screw-nut transmission mechanisms with double nuts and double helix directions. And the double nuts of one set of the lead screw-nut transmission mechanism are located in the middle of the corresponding two sets of forming sleeves, while the double nuts of the other set of the lead screw-nut transmission mechanism are located outside the corresponding two sets of forming sleeves, so as to drive the two forming sleeves to approach or move away from each other through the double nuts respectively. Moving bearing seats are provided on both sides of each group of upper forming sleeves and each group of lower forming sleeves to limit their axial positions. The moving bearing seats are connected to the nuts of the corresponding lead screw-nut transmission mechanisms, so as to realize driving them to move axially along the upper transmission shaft or the lower transmission shaft through the nuts of the lead screw-nut transmission mechanisms. The moving bearing seat includes a moving bearing seat body capable of moving along the corresponding upper support base or lower support base and a bearing installed in the moving bearing seat body for supporting the upper transmission shaft or the lower transmission shaft. The inner ring of the bearing is fixedly connected to the forming sleeve, and the inner ring of the bearing and the forming sleeve can axially slide along the key provided on the corresponding transmission shaft. The moving bearing seat body is fixedly connected to the nut of the corresponding lead screw-nut transmission mechanism. It further includes a forming sleeve support device. The forming sleeve support device includes at least one lifting shaft arranged perpendicular to the upper transmission shaft or the lower transmission shaft. The lifting shaft is slidably connected to the machine frame. A driving device is provided at one end of the lifting shaft far from the upper transmission shaft or the lower transmission shaft to drive it to move axially along its axis, and the other end acts on the corresponding moving bearing seat or the corresponding forming sleeve.

2. The double-flow roll forming machine according to claim 1, characterized in that: Each set of lead screw-nut transmission mechanisms includes more than 2 lead screw-nut transmission mechanisms, and they are evenly distributed circumferentially on the upper transmission shaft or the lower transmission shaft.

3. The double-flow roll forming machine according to claim 1, characterized in that: The lifting shaft acts on the corresponding forming sleeve through a double-roller support. The double-roller support is arranged at one end of the lifting shaft close to the upper transmission shaft or the lower transmission shaft, and includes a connecting shaft arranged in a T shape with the lifting shaft. Roller sleeves are sleeved at both ends of the connecting shaft and are rotatably connected to it.

4. A double-flow roll forming machine according to claim 1, characterized in that: The lifting shaft acts on the corresponding forming sleeve through a single-roller support. The single-roller support is arranged at one end of the lifting shaft close to the upper transmission shaft or the lower transmission shaft, and includes a connecting block fixed at the end of the lifting shaft and having a concave groove on the side far from the lifting shaft. A connecting shaft arranged perpendicular to the lifting shaft and a roller sleeve sleeved on the connecting shaft and rotatably connected to it are provided in the concave groove of the connecting block.

5. A double-flow roll forming machine according to claim 3 or 4, characterized in that: The roller sleeve is a flat roller sleeve or a concave roller sleeve.

6. The double-flow roll forming machine according to claim 3 or 4, characterized in that: The roller sleeve is rotatably connected to the transmission shaft through an inner bearing sleeve.

7. A double-flow roll forming machine according to claim 1, characterized in that: The lifting device is a hydraulic cylinder or a jack, located at both ends of the upper roller or the lower roller, installed on the machine frame, and the output end is connected to the corresponding upper support base or lower support base, so that the upper support base or the lower support base can lift along the vertical guide groove provided on the machine frame.

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