A straightening device for the production of hollow tubes of a drive shaft

Abstract

The present invention relates to the technical field of straightening devices, and discloses a straightening device for the production of hollow tubes of drive shafts, including a workbench. Two end support mechanisms and a pressing cylinder are arranged on the top of the workbench. The output end of the pressing cylinder is fixedly installed with a pressing head assembly. The pressing head assembly is composed of a housing, a locking mechanism and a plurality of plates. The plurality of plates slide vertically inside the housing, and their bottom ends protrude from the bottom of the housing. 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 housing and is used to lock the positions of the plurality of plates. The present invention improves the pressing head assembly of the straightening machine. When the hollow tube is pressed and straightened through the pressing head assembly, the plurality of plates contact the hollow tube a and are stressed to slide vertically and contract into the housing, so that the bottom ends of the plurality of plates automatically form an arc-shaped pressure surface matching the circumferential radian of the hollow tube a, ensuring that the pressing head assembly and the hollow tube can have a surface contact effect and can adapt to the circumferential radian of hollow tubes with different diameters.

Description

Technical Field

[0001] The present invention relates to the technical field of straightening devices, and more particularly to a straightening device for the production of hollow tubes of drive shafts. Background Art

[0002] In modern manufacturing, as an important part of the mechanical transmission system, the quality and precision of drive shafts are directly related to the operating efficiency and performance of the entire mechanical system. Especially in the automotive industry, drive shafts need to bear huge torques and bending forces, so extremely high requirements are placed on their straightness and strength. However, during the manufacturing process of drive shafts, 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 tubes of drive shafts often exhibit deformation problems such as bending and twisting. Therefore, it is necessary to straighten the hollow tubes during the production of drive shafts.

[0003] Chinese Patent (CN110538895A) discloses "a drive shaft straightening machine" including a frame, a workbench connected to the center of the frame, a pressing cylinder connected above the frame for straightening the drive shaft, and a detection mechanism for detecting the circumferential runout of the drive shaft. Above the workbench, a clamping mechanism for fixing the drive shaft is provided. On the side of the workbench, a driving mechanism for driving the clamping mechanism to slide is provided. On the side of the clamping mechanism, a detection mechanism for detecting the circumferential runout of the drive shaft is connected. The clamping mechanism includes a main spindle head, a main machine and a disc brake mechanism connected to the side of the main spindle head. The driving mechanism includes a frame plate, a lead screw and an auxiliary machine connected to the side of the workbench. The center of the lead screw is movably connected to a nut connected to the frame plate; this drive shaft straightening machine can straighten the drive shaft, changing the operational complexity of the conventional manual straightening of drive shafts by operators, and effectively improving the accuracy and convenience of drive shaft straightening.

[0004] However, existing straightening machines still have defects when straightening hollow tubes. For example, during the straightening process, it is necessary to apply pressure to the bent part of the hollow tube through a pressing head, and the pressing head part is in point contact with the pipe fitting, so that the local part of the pipe fitting will be subjected to a large pressure, which is likely to cause local depression or indentation of the pipe fitting, affecting the product quality. At present, there is a pressing head that adapts to the surface curvature of the pipe fitting, but it cannot adapt to the curvature of pipe fittings with different diameters, causing inconvenience in 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 hollow tubes of drive shafts to solve the problem that the pressing head part is likely to cause local depression or indentation of the hollow tube during the straightening process of the drive shaft straightening machine in the above-mentioned background art.

[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;

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] Further, the V-shaped folding arm includes a main arm body, a sub-arm body, and a pin. The top ends of the main arm body and the sub-arm body are rotatably sleeved with connecting ends. A convex button is provided at the bottom end of the main arm body. The bottom end of the sub-arm body is rotatably sleeved on the convex button, and the bottom end of the main arm body is rotatably sleeved on the side wall of the pin. Both ends of the pin are fixedly connected to the inner wall of the bottom fitting groove of the vertical moving plate. The outer ends of the two connecting ends are fixedly connected to the inner sides of the two inner supporting pressing plates.

[0013] Further, the turning arm transmission member includes a main arm plate. The main arm plate is rotatably sleeved on the outer wall of the housing through a connecting button. Two sliding grooves are provided on the side wall of the main arm plate, and a moving knob one and a moving knob two are respectively movably sleeved in the two sliding grooves. The moving knob two is fixedly connected to the outer wall of the outer pressing head through a joint. The moving knob one is fixedly connected to one end of the sliding arm.

[0014] Further, the outer sides of the two inner supporting pressing plates are provided with matte surfaces.

[0015] Further, a release suspension plate is fixedly connected to the inner wall of the housing. Strip-shaped through grooves are provided on the side walls of several sheet plates. The release suspension plate is slidably sleeved in the strip-shaped through grooves of several sheet plates.

[0016] Further, rail grooves are provided on both sides of several sheet plates. A plurality of positioning convex strips are provided on both sides of the inner wall of the housing. A plurality of positioning convex strips on both sides of the housing are respectively slidably sleeved in the rail grooves on both sides of several sheet plates.

[0017] Further, an embedding groove is provided on one side of the positioning convex strip facing the inner wall of the housing.

[0018] Further, rubber contact heads are fixedly connected to the bottom ends of several sheet plates.

[0019] The technical effects and advantages of the present invention:

[0020] The present invention improves the pressing head assembly of the straightening machine. By providing a housing, several sheet plates, and a locking mechanism to form a pressing head assembly. When straightening is performed by pressing through the hollow tube of the pressing head assembly, several sheet plates come into contact with the hollow tube a and are stressed to slide vertically and contract into the housing. Several sheet plates form a height difference according to the circumferential radian of the hollow tube a and are position-locked by the locking mechanism, so that an arc-shaped pressure surface matching the circumferential radian of the hollow tube a is automatically formed at the bottom ends of several sheet plates, ensuring that the pressing head assembly and the hollow tube can have a surface contact effect and can adapt to the circumferential radian of hollow tubes with different diameters. Thus, it avoids the contact between the pressing head and the hollow tube in the transmission equipment, resulting in local depression or indentation conditions.

[0021] On this basis, the structure of the locking mechanism is further optimized. By setting an outer support lock and an elastic reset member, they can be linked with the position change of several plates, realizing the automatic triggering of the locking mechanism to lock and unlock the positions of the plates. That is, after the pressure surfaces at the bottoms of several plates match the circumferential arc surface of the hollow tube, the arc is automatically locked to facilitate uniform pressure on the contact surface of the hollow tube. When several plates are stressed and shrink towards the inside of the housing to form a height difference, they continue to retract into the pressure head assembly, generating an upward thrust on the outer support lock, causing the outer support lock to expand outward and form a support force on the inner walls of several plates. Under the action of friction, several plates are locked, and the elastic reset member always forms a downward pressure on the outer support lock. When several plates are not in contact with the hollow tube, the upward thrust of several plates on the outer support lock disappears, and under the downward pressure effect of the elastic reset member, the outer support lock returns to its original shape, that is, the unlocking effect on the plates is achieved;

[0022] In addition, the structure of the elastic reset member is further optimized, and two outer pressure heads are set to be linked with it. While the elastic reset member achieves the function of resetting the shape of the outer support lock, it can also transmit the pressure generated by the rise of several plates, thereby driving the two outer pressure heads to apply a clamping force on the outer walls on both sides of several plates. On the one hand, the friction between the outer pressure heads and several plates improves the locking tightness of the positions of several plates. On the other hand, the counteraction between the two outer pressure heads and the outer support force applied by the outer support lock on the inner walls of the plates is formed to prevent the outer support force applied by the outer support lock on the inner walls of the plates from being too large and causing the plates to deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is of the present invention Figure 1 a schematic diagram of the structure of the pressure head assembly in;

[0025] Figure 3 is of the present invention Figure 2 a schematic diagram of the structure of the locking mechanism in;

[0026] Figure 4 is of the present invention Figure 3 a schematic diagram of the structure of the elastic reset member in;

[0027] Figure 5 is of the present invention Figure 4 a schematic diagram of the structure of the flip arm transmission member in;

[0028] Figure 6 is of the present invention Figure 3 a schematic diagram of the structure of the outer support lock in;

[0029] Figure 7 is of the present invention Figure 6 a schematic diagram of the structure of the V-shaped folding arm in;

[0030] Figure 8 For the present invention Figure 2 Front view of the cross-section of the housing and the sheet board in the present invention;

[0031] Figure 9 For the present invention Figure 2 Schematic side view structure diagram of the sheet board in the present invention.

[0032] Reference numerals are: 1, workbench; 2, end support mechanism; 3, pressing cylinder; 4, pressing head assembly; 5, housing; 6, sheet board; 7, locking mechanism; 8, positioning rib; 9, releasing hanging plate; 10, embedding groove; 71, gantry beam frame; 72, outer support locking member; 73, cross beam; 74, elastic reset member; 75, outer pressing head; 741, Y-shaped vertical frame; 742, sliding arm; 743, tension spring; 744, turning arm transmission member; 745, bevel joint plate; 7441, main arm plate; 7442, connecting button; 7443, moving knob one; 7444, moving knob two; 7445, joint; 721, vertical moving plate; 722, fitting groove; 723, V-shaped folding arm; 724, sliding column; 725, pressing strip; 726, inner support pressing plate; 7231, main arm body; 7232, sub-arm body; 7233, pin column; 7234, convex button; 7235, connecting end; 61, rubber contact. Detailed implementation manners

[0033] The following will describe in detail the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0034] Referring to Figure 1 、 2 、3, the present invention provides a straightening device for producing a hollow tube of a transmission shaft, including a workbench 1, two end support mechanisms 2 and a pressing cylinder 3 are arranged on the top of the workbench 1, a pressing head assembly 4 is fixedly installed at the output end of the pressing cylinder 3, the two end support mechanisms 2 are used to support both ends of the straightening part, the hollow tube a, and control its rotation, and the pressing cylinder 3 is used to output pressure to drive the pressing head assembly 4 to press and straighten the bent part of the hollow tube a;

[0035] The pressing head assembly 4 is composed of a housing 5, a locking mechanism 7 and a plurality of sheet boards 6. The plurality of sheet boards 6 slide vertically inside the housing 5, and their bottom ends protrude from the bottom of the housing 5. The bottom ends of the plurality of sheet boards 6 form a pressure surface in contact with the outer surface of the hollow tube a. The locking mechanism 7 is arranged inside the housing 5 and is used to lock the positions of the plurality of sheet boards 6;

[0036] The locking mechanism 7 includes a gantry beam frame 71, an outer 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 outer support locking member 72 inside the housing 5. A plurality of cross beams 73 are fixedly connected to 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 docked with the outer support locking member 72;

[0037] 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 .

[0038] 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. Figure 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.

[0039] 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.

[0040] 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.

[0041] Reference Figure 3 ,4 The 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.

[0042] 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.

[0043] 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, and the bottom end of the secondary arm body 7232 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.

[0044] 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.

[0045] Reference Figure 5 Figure 5 , the turning arm transmission member 744 includes a main arm plate 7441. The main arm plate 7441 is rotatably sleeved on the outer wall of the housing 5 through a connection button 7442. Two sliding grooves are provided on the side wall of the main arm plate 7441, and a moving knob one 7443 and a moving knob two 7444 are respectively movably sleeved in the two sliding grooves. The moving knob two 7444 is fixedly connected to the outer wall of the outer pressure head 75 through a joint 7445, and the moving knob one 7443 is fixedly connected to one end of the sliding arm 742.

[0046] When the sliding arm 742 is displaced, a force is applied to the moving knob one 7443, causing the main arm plate 7441 to flip with the connection button 7442 as the rotation point. By the flipping of the main arm plate 7441, a force is applied to the outer pressure head 75 through the joint 7445, thereby achieving the effect of driving the displacement of the outer pressure head 75.

[0047] Reference Figure 6 Figure 6 , the outer sides of the two inner support pressing plates 726 are provided with matte surfaces.

[0048] Since the outer sides of the two inner support pressing plates 726 are tightly attached to the inner walls of several plates 6 to achieve the position locking effect, the setting of the matte surfaces of the inner support pressing plates 726 can improve the friction between the inner support pressing plates 726 and the inner walls of the plates 6, and thus the outer support lock 72 can achieve a better position locking effect on the plates 6.

[0049] Reference Figure 8 Figure 8 , a release suspension plate 9 is fixedly connected to the inner wall of the housing 5, and strip-shaped through grooves are provided on the side walls of several plates 6. The release suspension plate 9 is slidably sleeved in the strip-shaped through grooves of several plates 6.

[0050] By providing the cooperation of the release suspension plate 9 and the strip-shaped through grooves on the side walls of the plates 6, the situation that the plates 6 fall off from the inside of the housing 5 can be avoided.

[0051] Reference Figure 8 Figure 8 , rail grooves are provided on both sides of several plates 6, and several positioning convex strips 8 are provided on both sides of the inner wall of the housing 5. The several positioning convex strips 8 on both sides of the housing 5 are respectively slidably sleeved in the rail grooves on both sides of several plates 6.

[0052] By providing the cooperation of the positioning convex strips 8 and the rail grooves of the plates 6, the plates 6 can be kept stable when moving up and down, and the situation that several plates 6 are skewed when sliding inside the housing 5 can be avoided.

[0053] Reference Figure 8 Figure 8 , a groove 10 is provided on one side of the positioning convex strip 8 facing the inner wall of the housing 5.

[0054] Since the elastic reset member 74 drives the outer pressure head 75 to clamp a plurality of plates 6, and the positioning rib 8 causes interference to the outer pressure head 75, an embedding groove 10 is provided on the positioning rib 8. When the outer pressure head 75 moves, it can be inserted into the embedding groove 10 to contact the plate 6, thereby avoiding the interference of the positioning rib 8 to the outer pressure head 75.

[0055] Refer to Figure 9 , rubber contact heads 61 are fixedly connected to the bottom ends of a plurality of plates 6.

[0056] By providing the rubber contact heads 61 to contact the outer wall of the straightening member hollow tube a, indentation can be avoided when the bottom end of the plate 6 contacts and presses the hollow tube a.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended 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. The straightening device for the production of a hollow shaft of a drive shaft 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. The straightening device for the production of a hollow shaft of a drive shaft 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. The straightening device for the production of a hollow shaft of a drive shaft 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 connecting ends (7235); the bottom end of the main arm body (7231) is provided with a convex button (7234); the bottom end of the secondary arm body (7232) 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. The straightening device for the production of a hollow tube of a drive shaft 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. The straightening device for producing a hollow tube of a transmission shaft 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 the production of a hollow shaft of a drive shaft, 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 the production of a hollow tube of a drive shaft, 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. The straightening device for producing a hollow tube of a transmission shaft according to claim 8, wherein: 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. A straightening device for producing a hollow shaft of a drive shaft, characterized in that: Rubber contact heads (61) are fixedly connected to the bottoms of several of the said sheet plates (6).

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