Straightening device for transmission shaft hollow pipe production

Abstract

The invention relates to the technical field of straightening devices, and discloses a straightening device for transmission shaft hollow pipe production, which comprises a worktable, two end supporting mechanisms and a pressure cylinder are arranged at the top of the worktable, a pressure head assembly is fixedly mounted at the output end of the pressure cylinder, and the pressure head assembly is composed of a shell, a locking mechanism and a plurality of plates. The plurality of sheet plates vertically slide in the shell, the bottom ends of the sheet plates protrude out of the bottom of the shell, the bottom ends of the plurality of sheet plates form pressure surfaces in contact with the outer surface of the hollow pipe a, and the locking mechanism is arranged in the shell and used for locking the positions of the plurality of sheet plates; the pressure head assembly of the straightening machine is improved, when a hollow pipe is pressed and straightened through the pressure head assembly, the multiple sheet plates make contact with the hollow pipe a to be stressed, vertically slide and contract into the shell, and the bottom ends of the multiple sheet plates automatically form an arc-shaped pressure face matched with the circumferential radian of the hollow pipe a; it is ensured that the pressing head assembly can be in surface contact with the hollow pipe, and the pressing head assembly can adapt to the circumferential radians of hollow pipes with different diameters.

Description

Technical Field

[0001] The invention relates to the technical field of straightening devices, and more specifically to a straightening device for producing hollow transmission shaft tubes. Background Art

[0002] In modern manufacturing, the drive shaft is an important part of the mechanical transmission system. Its quality and precision are directly related to the operating efficiency and performance of the entire mechanical system. Especially in the automotive industry, the drive shaft needs to withstand huge torque and bending forces, so there are extremely high requirements for its straightness and strength. However, in the manufacturing process of the drive shaft, especially in the production and processing of hollow tubes, due to the characteristics of the material itself and the limitations of the processing technology, the hollow tube of the drive shaft often has deformation problems such as bending and twisting. Therefore, the hollow tube needs to be straightened during the production of the drive shaft.

[0003] Chinese patent (CN110538895A) discloses "a transmission shaft straightening machine" including a frame, a workbench connected to the center of the frame, a pressure cylinder connected to the top of the frame for straightening the transmission shaft, and a detection mechanism for detecting the circumferential runout of the transmission shaft, a clamping mechanism for fixing the transmission shaft is arranged above the workbench, a driving mechanism for driving the clamping mechanism to slide is arranged on the side of the workbench, a detection mechanism for detecting the circumferential runout of the transmission shaft is connected to the side of the clamping mechanism, the clamping mechanism includes a spindle head, and a main machine and a disc brake mechanism connected to the side of the spindle head, the driving mechanism includes a frame plate, and a screw rod and an auxiliary machine connected to the side of the workbench, and a nut connected to the frame plate is movably connected in the center of the screw rod; the transmission shaft straightening machine can straighten the transmission shaft, which changes the complexity of the conventional transmission shaft manual straightening operation by the operator, and effectively improves the accuracy and convenience of transmission shaft straightening.

[0004] However, the existing straightening machines still have defects when straightening hollow tubes. For example, during the straightening process, a pressure head is required to apply pressure to the bending part of the hollow tube for straightening. The pressure head part is in point contact with the pipe fitting, which causes the pressed part of the pipe fitting to be subjected to greater pressure, which may easily lead to dents or indentations in the part, affecting product quality. The current pressure head has an adaptable curvature to the surface of the pipe fitting, but it cannot adapt the curvature to pipe fittings of different diameters, causing inconvenience to use. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a straightening device for the production of drive shaft hollow tubes, so as to solve the problem that during the straightening process of the drive shaft hollow tube by the transmission straightening machine in the above-mentioned background technology, the pressure head part easily causes local depression or indentation of the hollow tube.

[0006] The present invention provides the following technical solution: a straightening device for producing a hollow tube of a transmission shaft, comprising a workbench, two end support mechanisms and a pressure cylinder are arranged on the top of the workbench, a pressure head assembly is fixedly installed at the output end of the pressure cylinder, the two end support mechanisms are used to support the two ends of the straightening piece hollow tube a and control its rotation, and the pressure cylinder is used to output pressure to drive the pressure head assembly to press and straighten the bending part of the hollow tube a; The pressure head assembly is composed of a shell, a locking mechanism and a plurality of plates. The plurality of plates slide vertically inside the shell, and their bottom ends protrude from the bottom of the shell. The bottom ends of the plurality of plates form a pressure surface in contact with the outer surface of the hollow tube a. The locking mechanism is arranged inside the shell to lock the positions of the plurality of plates. The locking mechanism includes a gantry beam frame, an external support locking member, and a plurality of elastic reset members. The gantry beam frame is fixedly connected inside the housing, and the gantry beam frame is used to fix the external support locking member inside the housing. A plurality of cross beams are fixedly connected on both sides of the gantry beam frame. The elastic reset members are arranged in the cross beams on both sides of the gantry beam frame and docked with the external support locking member. The upward sliding lifting pressure of the plurality of plates triggers the deformation of the external support locking member to lock the positions of the plurality of plates. When the upward sliding lifting pressure of the plurality of plates disappears, the external support locking member is driven to restore its shape through the elastic reset member.

[0007] Furthermore, the external support locking member includes a vertical sliding plate and two internal support pressure plates. The vertical sliding plate is slidably sleeved on the inner wall of the gantry beam frame. A plurality of accessory grooves are provided at the bottom of the vertical sliding plate. V-shaped folding arms are provided in the plurality of accessory grooves. A pressure strip is fixedly installed at the bottom of the vertical sliding plate. Both sides of the V-shaped folding arms are respectively fixedly connected to the inner side surfaces of the two internal support pressure plates. Both inner side surfaces of the two internal support pressure plates are fixedly connected with sliding columns. Positioning column grooves are provided on both sides of the gantry beam frame. The sliding columns on the inner side surfaces of the two internal support pressure plates are respectively slidably sleeved in the positioning column grooves on both sides of the gantry beam frame, and the top of the vertical sliding plate is connected to the elastic reset member.

[0008] Furthermore, the locking mechanism also includes two external pressure heads, and the two external pressure heads respectively penetrate into the interior of the outer shell from both sides of the outer shell, and the elastic reset component includes a Y-shaped frame, two sliding arms, and two flip arm transmission components. The bottom end of the Y-shaped frame is connected to the external support locking component, and the two sliding arms are respectively slidably sleeved on the inner walls of the cross beams on both sides of the gantry beam frame, and the inner ends of the two sliding arms are movably connected to the two Y-shaped frames through two miter plates, and the inner sides of the two sliding arms are transmission-connected to the inner walls of the tension springs through tension springs. Two flip arm transmission components are installed on both sides of the outer shell, and the two external pressure heads and the outer ends of the sliding arms are respectively connected to the two flip arm transmission components, and the two sliding arms slide toward the outside to control the flipping of the two flip arm transmission components, and the flipping of the two flip arm transmission components is used to control the two external pressure heads to slide inward.

[0009] Furthermore, the V-shaped folding arm includes a main arm body, a secondary arm body, and a pin column. The top ends of the main arm body and the secondary arm body are both rotatably sleeved with connecting ends. The bottom end of the main arm body is provided with a convex button, and the bottom end of the connecting end is rotatably sleeved on the convex button. The bottom end of the main arm body is rotatably sleeved on the side wall of the pin column. The two ends of the pin column are fixedly connected to the inner wall of the accessory groove at the bottom of the vertical moving plate, and the outer ends of the two connecting ends are fixedly connected to the inner sides of the two inner support pressure plates.

[0010] Furthermore, the flip arm transmission component includes a main arm plate, which is rotatably sleeved on the outer wall of the shell through a connecting button. Two sliding grooves are provided on the side wall of the main arm plate, and a movable knob 1 and a movable knob 2 are movably sleeved in the two sliding grooves respectively. The movable knob 2 is fixedly connected to the outer wall of the external pressure head through a joint, and the movable knob 1 is fixedly connected to one end of the sliding arm.

[0011] Furthermore, the outer side surfaces of the two inner support pressure plates are configured as frosted surfaces.

[0012] Furthermore, a release and removal hanging plate is fixedly connected to the inner wall of the shell, and the side walls of several of the sheet plates are provided with strip-shaped through grooves, and the release and removal hanging plate is slidably sleeved in the strip-shaped through grooves of several sheet plates.

[0013] Furthermore, rail grooves are provided on both sides of the plurality of sheets, and a plurality of positioning convex strips are provided on both sides of the inner wall of the shell. The plurality of positioning convex strips on both sides of the shell are respectively slidably sleeved in the rail grooves on both sides of the plurality of sheets.

[0014] Furthermore, the positioning convex strip is provided with an embedding groove on one side facing the inner wall of the shell.

[0015] Furthermore, the bottom ends of the plurality of plates are fixedly connected with rubber contacts.

[0016] Technical effects and advantages of the present invention: The present invention improves the pressure head assembly of the straightening machine. The pressure head assembly is formed by arranging a shell, a plurality of plates, and a locking mechanism. When the pressure head assembly is pressed and straightened through the hollow tube of the pressure head assembly, the plurality of plates are in contact with the hollow tube a and subjected to force to slide vertically and shrink into the shell. The plurality of plates are adapted to form a height difference according to the circumferential curvature of the hollow tube a, and the positions are locked by the locking mechanism, so that the bottom ends of the plurality of plates automatically form an arc-shaped pressure surface matching the circumferential curvature of the hollow tube a, ensuring that the pressure head assembly and the hollow tube can have a planar contact effect, and can adapt to the circumferential curvature of hollow tubes of different diameters, thereby avoiding the pressure head in the transmission device from contacting the hollow tube, thereby preventing the local depression or indentation from occurring. On the basis of the above, the structure of the locking mechanism is also optimized. By setting an external support locking member and an elastic reset member, the cooperation with the position change of the plurality of plates can be linked to achieve the locking mechanism automatically triggering the locking effect and the automatic unlocking effect of the plate position. That is, after the pressure surface of the bottom end of the plurality of plates matches the circumferential arc surface of the hollow tube, the arc locking is automatically performed to facilitate uniform pressure on the contact surface of the hollow tube. When the plurality of plates are forced to shrink toward the inside of the shell to form a height difference, they continue to retract toward the inside of the pressure head assembly to generate an upward thrust on the external support locking member, so that the external support locking member expands outward to form a supporting force on the inner wall of the plurality of plates, and the plurality of plates are locked under the action of friction, while the elastic reset member always forms a downward pressure on the external support locking member. When the plurality of plates are not in contact with the hollow tube, the upward thrust of the plurality of plates on the external support locking member disappears, and the external support locking member restores its shape under the downward pressure effect of the elastic reset member, i.e., the plate is unlocked. In addition, the structure of the elastic reset member is further optimized, and two external pressure heads are arranged to work in conjunction with it, so that the elastic reset member can transmit the rising pressure of a number of plates while achieving the function of resetting the shape of the external support locking member, thereby driving the two external pressure heads to apply clamping force to the outer walls on both sides of the number of plates. On the one hand, the friction between the external pressure heads and the number of plates is used to improve the position locking tightness of the number of plates. On the other hand, the two external pressure heads and the external support locking member exert a counteraction on the external support force exerted on the inner wall of the plate, thereby preventing the external support force exerted by the external support locking member on the inner wall of the plate from being too large, causing deformation of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the pressure head assembly structure; Figure 3 For the present invention Figure 2 A schematic diagram of the locking mechanism structure in FIG. Figure 4 For the present invention Figure 3 Schematic diagram of the elastic reset member structure; Figure 5 For the present invention Figure 4 Schematic diagram of the structure of the flip arm transmission component; Figure 6 For the present invention Figure 3 A schematic diagram of the structure of the outer support lock; Figure 7 For the present invention Figure 6 Schematic diagram of the V-shaped folding arm structure; Figure 8 For the present invention Figure 2 The front view of the shell and the plate section in FIG. Fig. 9 For the present invention Figure 2 Schematic diagram of the side view structure of the plate in.

[0018] The accompanying drawings are marked as follows: 1, workbench; 2, end support mechanism; 3, pressure cylinder; 4, pressure head assembly; 5, housing; 6, plate; 7, locking mechanism; 8, positioning convex strip; 9, release and release hanging plate; 10, embedded groove; 71, gantry beam frame; 72, external support lock; 73, cross beam; 74, elastic reset member; 75, external pressure head; 741, Y-shaped frame; 742, sliding arm; 743, tension spring; 744, flip arm transmission member; 745, miter plate ; 7441, main arm plate; 7442, connecting button; 7443, moving knob one; 7444, moving knob two; 7445, joint; 721, vertical moving plate; 722, accessory slot; 723, V-shaped folding arm; 724, sliding column; 725, pressure strip; 726, inner support pressure plate; 7231, main arm body; 7232, auxiliary arm body; 7233, pin column; 7234, convex button; 7235, connecting end; 61, rubber contact. DETAILED DESCRIPTION

[0019] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0020] Reference Figure 1 , 2 3. The present invention provides a straightening device for the production of a transmission shaft hollow tube, comprising a workbench 1, two end support mechanisms 2 and a pressure cylinder 3 are arranged on the top of the workbench 1, a pressure head assembly 4 is fixedly installed at the output end of the pressure cylinder 3, the two end support mechanisms 2 are used to support the two ends of the straightening member hollow tube a and control its rotation, and the pressure cylinder 3 is used to output pressure to drive the pressure head assembly 4 to press and straighten the bending part of the hollow tube a; The pressure head assembly 4 is composed of a shell 5, a locking mechanism 7 and a plurality of plates 6. The plurality of plates 6 slide vertically inside the shell 5, and their bottom ends protrude from the bottom of the shell 5. The bottom ends of the plurality of plates 6 form a pressure surface in contact with the outer surface of the hollow tube a. The locking mechanism 7 is arranged inside the shell 5 to lock the positions of the plurality of plates 6. The locking mechanism 7 includes a gantry beam frame 71, an external support lock 72, and a plurality of elastic reset members 74. The gantry beam frame 71 is fixedly connected inside the housing 5. The gantry beam frame 71 is used to fix the external support lock 72 inside the housing 5. A plurality of cross beams 73 are fixedly connected on both sides of the gantry beam frame 71. The elastic reset members 74 are arranged in the cross beams 73 on both sides of the gantry beam frame 71 and dock with the external support lock 72. The upward sliding lifting pressure of the plurality of plates 6 triggers the deformation of the external support locking member 72 to lock the positions of the plurality of plates 6 . When the upward sliding lifting pressure of the plurality of plates 6 disappears, the external support locking member 72 is driven to restore its shape through the elastic reset member 74 .

[0021] When the hollow tube a is pressed by the pressure head assembly 4, the pressure surface at the bottom of the plurality of plates 6 contacts the hollow tube a, and the hollow tube a generates a reverse thrust on the plurality of plates 6 to make the plurality of plates 6 slide vertically. Fig. 9 As shown, in this process, several plates 6 respectively adapt to the height of the circumferential arc surface of the hollow tube a and have different sliding distances, so that the pressure surfaces at the bottom ends of several plates 6 adapt to the circumferential arc of the hollow tube a. As the pressure head assembly 4 continues to press downward, the plate 6 in contact with the hollow tube a continues to move upward to generate upward pressure on the external support locking member 72, so that the external support locking member 72 is deformed and expanded outward to generate an external support force on the inner wall of the plate 6. Under the action of friction, the several plates 6 achieve a position locking effect in the shell 5. As a result, the pressure surfaces formed at the bottom of the several plates 6 can apply surface pressure to the hollow tube a. When the pressure head assembly 4 moves upward, the pressure surfaces at the bottom ends of the several plates 6 are not in contact with the hollow tube a. At this time, the external support locking member 72 is not subject to the lifting pressure of the plate 6. Under the elastic effect of the elastic reset member 74, the shape is restored to unlock the position of the plate 6, and the several plates 6 slide down again to restore their positions under the influence of gravity.

[0022] Reference Figure 6 The outer support locking member 72 includes a vertical sliding plate 721 and two inner support pressure plates 726. The vertical sliding plate 721 is slidably sleeved on the inner wall of the gantry beam frame 71. A plurality of accessory grooves 722 are provided at the bottom of the vertical sliding plate 721. V-shaped folding arms 723 are provided in the plurality of accessory grooves 722. A pressure strip 725 is fixedly installed at the bottom of the vertical sliding plate 721. The two sides of the V-shaped folding arm 723 are respectively fixedly connected to the inner sides of the two inner support pressure plates 726. The inner sides of the two inner support pressure plates 726 are fixedly connected with sliding columns 724. Positioning column grooves are provided on both sides of the gantry beam frame 71. The sliding columns 724 on the inner sides of the two inner support pressure plates 726 are respectively slidably sleeved in the positioning column grooves on both sides of the gantry beam frame 71, and the top of the vertical sliding plate 721 is docked with the elastic reset member 74.

[0023] When the plurality of plates 6 move upward, their inner walls come into contact with the bottom of the pressure strip 725, and then the pressure strip 725 generates an upward thrust on the vertical moving plate 721. In this process, as the vertical moving plate 721 moves upward in height, the V-shaped folding arm 723 can be driven to gradually open, and then an outward thrust is generated on the two inner supporting pressure plates 726, so that the two inner supporting pressure plates 726 fit the inner walls of the plurality of plates 6 to form an external supporting effect, and the position of the plurality of plates 6 is locked under the action of friction. By setting a sliding column 724, the inner supporting pressure plate 726 can be positioned in the vertical direction to prevent it from shifting.

[0024] Reference Figure 3 , 4The locking mechanism 7 also includes two external pressure heads 75, which are respectively penetrated into the interior of the shell 5 from both sides of the shell 5. The elastic reset member 74 includes a Y-shaped frame 741, two sliding arms 742, and two flip arm transmission members 744. The bottom end of the Y-shaped frame 741 is connected to the external support locking member 72, and the two sliding arms 742 are respectively slidably sleeved on the inner walls of the cross beams 73 on both sides of the gantry beam frame 71. The inner ends of the two sliding arms 742 are movably connected to the two Y-shaped frames 741 through two miter plates 745, and the inner sides of the two sliding arms 742 are connected to the inner walls of the tension springs 743 through tension springs 743. The two flip arm transmission members 744 are installed on both sides of the shell 5, and the two external pressure heads 75 and the outer ends of the sliding arms 742 are respectively connected to the two flip arm transmission members 744. The two sliding arms 742 slide outward to control the flipping of the two flip arm transmission members 744, and the flipping of the two flip arm transmission members 744 is used to control the two external pressure heads 75 to slide inward.

[0025] When the outer support locking member 72 is deformed, upper and lower pressures are applied to the Y-shaped frame 741. When the Y-shaped frame 741 moves upward, it drives the two miter plates 745 to flip over. When the two miter plates 745 flip over and change from an inclined angle to a horizontal angle, an outward thrust is generated on the two sliding arms 742, causing the two sliding arms 742 to move outward and apply tension to the tension spring 743. At the same time, a force is applied to the flip arm transmission member 744 to flip the two flip arm transmission members 474, and drive the two external pressure heads 75 to slide to form a clamping effect on both sides of the plurality of plates 6. The sliding arm 742 can be reset by the tension of the tension spring 743, and the Y-shaped frame 741 can be reset in the opposite direction to control the outer support locking member 72 to restore its shape, and the tension spring 743 can be flipped to reset the two external pressure heads 75.

[0026] Reference Figure 7 The V-shaped folding arm 723 includes a main arm body 7231, a secondary arm body 7232, and a pin 7233. The tops of the main arm body 7231 and the secondary arm body 7232 are rotatably sleeved with connecting ends 7235. The bottom end of the main arm body 7231 is provided with a convex button 7234. The bottom end of the connecting end 7235 is rotatably sleeved on the convex button 7234. The bottom end of the main arm body 7231 is rotatably sleeved on the side wall of the pin 7233. Both ends of the pin 7233 are fixedly connected to the inner wall of the accessory groove 722 at the bottom of the vertical moving plate 721, and the outer ends of the two connecting ends 7235 are fixedly connected to the inner sides of the two inner support pressure plates 726.

[0027] When the vertical moving plate 721 moves upward, the pin 7233 is driven to move. Since the connecting end 7235 is connected to the inner supporting pressure plate 726 for vertical positioning, the main arm body 7231 and the auxiliary arm body 7232 can be flipped at an angle, and then the top ends of the main arm body 7231 and the auxiliary arm body 7232 can be displaced to both sides, producing a pushing effect on the two inner supporting pressure plates 726.

[0028] Reference Figure 5 The flip arm transmission member 744 includes a main arm plate 7441, which is rotatably sleeved on the outer wall of the shell 5 through a connecting button 7442. The side wall of the main arm plate 7441 is provided with two sliding grooves, in which a moving knob 1 7443 and a moving knob 2 7444 are movably sleeved respectively. The moving knob 2 7444 is fixedly connected to the outer wall of the external pressure head 75 through a joint 7445, and the moving knob 1 7443 is fixedly connected to one end of the sliding arm 742.

[0029] When the sliding arm 742 is displaced, a force is applied to the moving knob 7443, so that the main arm plate 7441 is flipped with the connecting button 7442 as the rotation point. The main arm plate 7441 is flipped and a force is applied to the external pressure head 75 through the joint 7445, thereby achieving the effect of driving the external pressure head 75 to move.

[0030] Reference Figure 6 The outer side surfaces of the two inner support plates 726 are set to be frosted surfaces.

[0031] Since the outer side surfaces of the two inner support pressure plates 726 are pressed against the inner walls of several sheet plates 6 to achieve a position locking effect, the frosted surface setting of the inner support pressure plates 726 can increase the friction between the inner support pressure plates 726 and the inner walls of the sheet plates 6, thereby enabling the outer support locking member 72 to achieve a better position locking effect on the sheet plates 6.

[0032] Reference Figure 8 The inner wall of the shell 5 is fixedly connected with a release hanging plate 9, and the side walls of the plurality of plates 6 are provided with strip-shaped through grooves, and the release hanging plate 9 is slidably sleeved in the strip-shaped through grooves of the plurality of plates 6.

[0033] By providing the release and release hanging plate 9 to cooperate with the strip-shaped through groove on the side wall of the sheet plate 6, the sheet plate 6 can be prevented from falling off from the inside of the shell 5.

[0034] Reference Figure 8 A plurality of plates 6 are provided with rail grooves on both sides, a plurality of positioning convex strips 8 are provided on both sides of the inner wall of the shell 5, and the plurality of positioning convex strips 8 on both sides of the shell 5 are respectively slidably sleeved in the rail grooves on both sides of the plurality of plates 6.

[0035] By providing the positioning convex strips 8 to cooperate with the rail grooves of the sheet plates 6 , the sheet plates 6 can maintain stability when moving up and down, thereby preventing several sheet plates 6 from tilting when sliding inside the housing 5 .

[0036] Reference Figure 8 A embedding groove 10 is formed on one side of the positioning convex strip 8 facing the inner wall of the shell 5 .

[0037] Since the elastic reset member 74 links the external pressure head 75 to clamp the plurality of plates 6, and the positioning convex strip 8 will cause interception interference to the external pressure head 75, an embedding groove 10 is provided on the positioning convex strip 8. When the external pressure head 75 moves, it can be inserted into the embedding groove 10 to contact the plate 6, thereby avoiding the positioning convex strip 8 from interfering with the external pressure head 75.

[0038] Reference Fig. 9 The bottom ends of the plurality of plates 6 are fixedly connected with rubber contacts 61 .

[0039] By arranging the rubber contact 61 to contact the outer wall of the hollow tube a of the straightening member, it is possible to avoid the generation of an indentation when the bottom end of the sheet 6 contacts and presses against the hollow tube a.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A straightening device for producing a hollow tube of a transmission shaft, comprising a workbench (1), wherein the top of the workbench (1) is provided with two end support mechanisms (2) and a pressure cylinder (3), wherein a pressure head assembly (4) is fixedly mounted at the output end of the pressure cylinder (3), wherein the two end support mechanisms (2) are used to support the two ends of the hollow tube a of the straightening member and control its rotation, and the pressure cylinder (3) is used to output pressure to drive the pressure head assembly (4) to apply pressure to the bending part of the hollow tube a for straightening, wherein the device is characterized in that: The pressure head assembly (4) is composed of a shell (5), a locking mechanism (7) and a plurality of plates (6); the plurality of plates (6) slide vertically inside the shell (5), and their bottom ends protrude from the bottom of the shell (5); the bottom ends of the plurality of plates (6) form a pressure surface in contact with the outer surface of the hollow tube a; the locking mechanism (7) is arranged inside the shell (5) and is used to lock the position of the plurality of plates (6); The locking mechanism (7) comprises a gantry beam frame (71), an external support locking member (72), and a plurality of elastic reset members (74); the gantry beam frame (71) is fixedly connected inside the housing (5); the gantry beam frame (71) is used to fix the external support locking member (72) inside the housing (5); a plurality of cross beams (73) are fixedly connected on both sides of the gantry beam frame (71); the elastic reset members (74) are arranged inside the cross beams (73) on both sides of the gantry beam frame (71) and are connected to the external support locking member (72); The upward sliding lifting pressure of the plurality of plates (6) triggers the deformation of the external support locking member (72) to lock the position of the plurality of plates (6); the upward sliding lifting pressure of the plurality of plates (6) disappears, and the external support locking member (72) is driven to restore its shape through the elastic reset member (74).

2. A straightening device for producing hollow transmission shaft tubes according to claim 1, characterized in that: The outer support locking member (72) comprises a vertical moving plate (721) and two inner support pressure plates (726). The vertical moving plate (721) is slidably sleeved on the inner wall of the gantry beam frame (71). A plurality of accessory grooves (722) are provided at the bottom of the vertical moving plate (721). V-shaped folding arms (723) are provided in the plurality of accessory grooves (722). A pressure strip (725) is fixedly installed at the bottom of the vertical moving plate (721). Both sides of the V-shaped folding arms (723) are respectively fixedly connected to the inner side surfaces of the two inner support pressure plates (726). Both inner side surfaces of the two inner support pressure plates (726) are fixedly connected to sliding columns (724). Positioning column grooves are provided at both sides of the gantry beam frame (71). The sliding columns (724) on the inner side surfaces of the two inner support pressure plates (726) are respectively slidably sleeved in the positioning column grooves on both sides of the gantry beam frame (71). The top of the vertical moving plate (721) is butt-jointed with the elastic reset member (74).

3. A straightening device for producing hollow transmission shaft tubes according to claim 1, characterized in that: The locking mechanism (7) further comprises two external pressure heads (75), the two external pressure heads (75) respectively penetrate into the interior of the housing (5) from both sides of the housing (5), the elastic reset member (74) comprises a Y-shaped stand (741), two sliding arms (742), and two flip arm transmission members (744), the bottom end of the Y-shaped stand (741) is butted against the external support lock member (72), the two sliding arms (742) are respectively slidably sleeved on the inner walls of the cross beams (73) on both sides of the gantry beam frame (71), and the inner ends of the two sliding arms (742) are respectively connected through two miter plates ( The outer ends of the two external pressure heads (75) and the external ends of the sliding arms (742) are respectively connected to the two flip arm transmission members (744). The two sliding arms (742) slide outward to control the flipping of the two flip arm transmission members (744). The flipping of the two flip arm transmission members (744) is used to control the two external pressure heads (75) to slide inward.

4. A straightening device for producing hollow transmission shaft tubes according to claim 2, characterized in that: The V-shaped folding arm (723) comprises a main arm body (7231), a secondary arm body (7232), and a pin column (7233); the top ends of the main arm body (7231) and the secondary arm body (7232) are both rotatably sleeved with a connecting end (7235); the bottom end of the main arm body (7231) is provided with a convex button (7234); the bottom end of the connecting end (7235) is rotatably sleeved on the convex button (7234); the bottom end of the main arm body (7231) is rotatably sleeved on the side wall of the pin column (7233); the two ends of the pin column (7233) are fixedly connected to the inner wall of the accessory groove (722) at the bottom of the vertical moving plate (721); and the outer ends of the two connecting ends (7235) are fixedly connected to the inner side surfaces of the two inner support pressure plates (726).

5. A straightening device for producing hollow transmission shaft tubes according to claim 3, characterized in that: The flip arm transmission member (744) comprises a main arm plate (7441), the main arm plate (7441) being rotatably sleeved on the outer wall of the housing (5) via a connecting button (7442), the side wall of the main arm plate (7441) being provided with two sliding grooves, in which a moving knob 1 (7443) and a moving knob 2 (7444) are movably sleeved respectively, the moving knob 2 (7444) being fixedly connected to the outer wall of the external pressure head (75) via a joint (7445), and the moving knob 1 (7443) being fixedly connected to one end of the sliding arm (742).

6. A straightening device for producing hollow transmission shaft tubes according to claim 2, characterized in that: The outer side surfaces of the two inner support pressing plates (726) are arranged as frosted surfaces.

7. A straightening device for producing hollow transmission shaft tubes according to claim 1, characterized in that: The inner wall of the outer shell (5) is fixedly connected with a release and hanging plate (9), and the side walls of the plurality of sheet plates (6) are provided with strip-shaped through grooves, and the release and hanging plate (9) is slidably sleeved in the strip-shaped through grooves of the plurality of sheet plates (6).

8. A straightening device for producing hollow transmission shaft tubes according to claim 7, characterized in that: Rail grooves are provided on both sides of the plurality of plates (6), and a plurality of positioning convex strips (8) are provided on both sides of the inner wall of the outer shell (5). The plurality of positioning convex strips (8) on both sides of the outer shell (5) are respectively slidably sleeved in the rail grooves on both sides of the plurality of plates (6).

9. A straightening device for producing hollow transmission shaft tubes according to claim 8, characterized in that: The positioning convex strip (8) is provided with an embedding groove (10) on one side facing the inner wall of the outer shell (5).

10. The straightening device for producing hollow transmission shaft tubes according to claim 1, characterized in that: The bottom ends of the plurality of plates (6) are all fixedly connected with rubber contacts (61).

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