A fixed section press-fitting device

Abstract

The present invention relates to the technical field of fixed joint assembly, and discloses a fixed joint pressing device, which includes a pressing device, a fixing device and a supporting device. The pressing device includes a first hydraulic press and a pressing head. The pressing head includes: a mounting seat, the top of the mounting seat is detachably connected to the push rod of the first hydraulic press; an inner pressing column, the bottom of the mounting seat is fixedly connected to the inner pressing column, and the bottom of the inner pressing column is in the shape of a cone or frustum with a narrower bottom and a wider top; an outer pressing column, the outer pressing column is slidably connected to the outside of the inner pressing column, and the top of the outer pressing column is connected to the bottom of the mounting seat through a vertical spring; side pressing blocks, symmetrically arranged sliding holes are provided on both sides of the outer pressing column near the bottom, and side pressing blocks are slidably connected in the sliding holes. The ends of the side pressing blocks located inside the outer pressing column are provided with sliding inclined surfaces, and the sliding inclined surfaces are in contact with the conical inclined surfaces at the bottom of the inner pressing column. It has the advantages of automatically pressing the universal joint into the shaft rod, automatically detecting whether the position of the universal joint is accurate, and preventing the universal joint from popping out.

Description

Technical Field

[0001] The present invention relates to the technical field of fixed joint assembly, and specifically to a fixed joint pressing device. Background Art

[0002] In the field of automated equipment manufacturing for automotive parts, the assembly of drive shafts is a crucial link, especially the press-fitting between fixed joints, movable joints, and solid shafts. Traditional fixed joint pressing equipment has many defects, seriously restricting the improvement of production efficiency and product quality, and at the same time bringing greater safety risks to operators.

[0003] In previous fixed joint pressing equipment, the spline alignment between the solid shaft and the fixed joint completely relied on manual operation. Operators had to rely on experience and visual judgment to try to align the universal joint (fixed joint) with the splines on the shaft rod. However, due to the lack of precise auxiliary tools and automated means, in actual operation, the situation where the universal joint is not vertically aligned with the splines on the shaft rod often occurs. This is because it is difficult to ensure that the universal joint can be precisely adjusted to the appropriate position and angle every time by manual operation, and small deviations may cause serious problems during subsequent pressing.

[0004] A universal joint pressing device with the patent publication number CN201618948U can detect the pressure during pressing in real time by using a tension-compression sensor, effectively improving the quality of products. However, its detection is carried out on the premise that the universal joint is accurately pressed into the shaft rod.

[0005] When the splines between the universal joint and the shaft rod are not accurately aligned, if forced pressing is carried out, due to the unbalanced interaction force between the splines, a large lateral force will be generated. This lateral force may instantaneously exceed the connection constraints between the universal joint and surrounding components or its own structural strength, resulting in the universal joint flying off. This will not only damage the equipment, but may also endanger the personal safety of operators in severe cases, greatly increasing the uncertainty and danger during the production process.

[0006] In addition, existing equipment lacks an effective detection device for whether the pressing is accurate. After the pressing process is completed, it is impossible to know in time whether the universal joint is accurately press-fitted with the splines on the shaft rod. If there is a deviation in the pressing position, whether it exceeds the standard position or does not reach the standard depth, the overall performance of the product will be greatly reduced. For example, it may cause problems such as increased vibration, reduced transmission efficiency, premature wear, or even failure during the operation of the drive shaft, seriously affecting the quality stability and reliability of the product. Summary of the Invention

[0007] (I) Technical Problems to be Solved

[0008] In view of the deficiencies of the prior art, the present invention provides a fixed joint pressing device, which has the advantages of automatically pressing the universal joint into the shaft rod, automatically detecting whether the position of the universal joint is accurate, and preventing the universal joint from popping out, and solves the problem of the lack of an effective detection device for whether the pressing position of the universal joint is accurate in the prior art.

[0009] (II) Technical Solution

[0010] To achieve the above object, the present invention provides the following technical solution:

[0011] A fixed joint pressing device includes a pressing device, a fixing device and a supporting device. The pressing device includes a first hydraulic press and a pressing head. The pressing head includes:

[0012] A mounting seat, the top of the mounting seat is detachably connected to the push rod of the first hydraulic press;

[0013] An inner pressing column, the bottom of the mounting seat is fixedly connected to the inner pressing column, and the bottom of the inner pressing column is in the shape of a cone or frustum with a narrower bottom and a wider top;

[0014] An outer pressing column, the outer pressing column is slidably connected to the outside of the inner pressing column, and the top of the outer pressing column is connected to the bottom of the mounting seat through a vertical spring;

[0015] Side pressing blocks, symmetrically arranged sliding holes are provided on both sides of the outer pressing column near the bottom, side pressing blocks are slidably connected in the sliding holes, and sliding inclined surfaces are arranged at the ends of the side pressing blocks located inside the outer pressing column, and the sliding inclined surfaces are attached to the conical inclined surfaces at the bottom of the inner pressing column;

[0016] When the first hydraulic press pushes the pressing head down, the bottom of the outer pressing column first presses on the universal joint. At this time, the mounting seat and the inner pressing column continue to press down, and the conical inclined surface at the bottom of the inner pressing column pushes the side pressing blocks outwards to both sides. When the position of the universal joint is accurate, the side pressing blocks are pushed outwards and inserted into the joint fork holes, so as to fix the universal joint from both sides while pressing down the universal joint, preventing the universal joint from popping out or shifting. When the position of the universal joint is offset, the side pressing blocks do not align with the joint fork holes, and the side pressing blocks are stuck by the joint fork part of the universal joint when being pushed outwards.

[0017] Preferably, a vertical pressure sensor is provided at the bottom of the mounting base at the part connected to the vertical spring. The vertical pressure sensor is used to detect the upward pressure of the vertical spring. According to the upward pressure of the vertical spring, the distance between the bottom of the mounting base and the top of the outer ejector post can be analyzed. When the inner ejector post slides downward relative to the outer ejector post to a specified distance, that is, after the side ejector block protrudes outward by a certain distance, the vertical pressure sensor detects that the upward pressure of the vertical spring exceeds the preset value, so that the vertical pressure sensor can judge whether the side ejector block protrudes outward smoothly according to the pressure value, that is, judge whether the universal joint is accurately aligned with the shaft rod. The vertical pressure sensor is connected to control the first hydraulic press. When the pressure value detected by the vertical pressure sensor reaches the preset value, the first hydraulic press is controlled to increase the pressure to press the universal joint into the shaft rod.

[0018] Preferably, at least one key is provided on the sliding hole. A slot is provided on the side ejector block at the position corresponding to the key. A horizontal spring is provided in the slot. One end of the horizontal spring is connected to the key and the other end is connected to a horizontal pressure sensor provided in the side ejector block. The horizontal pressure sensor is used to detect the pressure of the horizontal spring in the horizontal direction, so as to judge the position of the side ejector block.

[0019] The support device includes a base and a support cylinder. The support cylinder is used to sleeve the outside of the bottom of the shaft rod. The support cylinder is detachably and fixedly connected to the top of the base. A pressure sensor is provided in the base to detect the downward pressure on the shaft rod.

[0020] When the pressure detected in the base increases while the pressure detected in the horizontal pressure sensor remains unchanged, it indicates that the side ejector block is not aligned with the joint fork hole. At the same time, the base can detect the pressure during pressing in real time.

[0021] Preferably, a sleeve is provided on the outside of the connection position between the mounting base and the outer ejector post. The top of the sleeve is detachably connected to the bottom of the mounting base. The top of the outer ejector post slides in the cavity between the sleeve and the inner ejector post. An exhaust hole is provided on the sleeve to communicate the cavity with the outside.

[0022] Preferably, the support cylinder includes an outer cylinder and an inner column. There is a gap between the outer cylinder and the inner column. The top of the shaft rod is inserted into the gap between the inner column and the outer cylinder. Outer splines that fit the inner splines of the shaft rod are provided on the outside of the inner column.

[0023] Preferably, the fixing device includes a second hydraulic press fixed on the frame of the pressing-in device. A push rod is slidably connected inside the second hydraulic press. One end of the push rod is fixedly connected with a cross plate. Chute grooves are arranged on both sides of the cross plate. The fixing device further includes only two symmetric chucks. One end of the chuck close to the second hydraulic press is rotatably connected inside the fixing device. The end of the chuck away from the second hydraulic press is used for clamping the shaft rod. A convex column is arranged at the middle position of the chuck. The convex column slides in the chute groove. When the push rod is pushed by the second hydraulic press towards the shaft rod, the cross plate pushes the convex column to slide through the chute groove, so that the end of the chuck away from the second hydraulic press rotates inwards to clamp the shaft rod.

[0024] Preferably, when the push rod moves to the farthest end, that is, the farthest position from the second hydraulic press, the end of the chuck away from the second hydraulic press is at an outwardly inclined angle to prevent the chuck from being perpendicular to the cross plate and getting stuck.

[0025] Preferably, a soft rubber pad is arranged on the inner side of the end of the chuck away from the second hydraulic press.

[0026] Preferably, the bottom surface of the outer ejector post is mutually attached to the top surface between the shaft rod joint forks. A soft rubber pad is arranged at the bottom of the outer ejector post.

[0027] Preferably, a chamfer is arranged at the edge of the end face of the side ejector block located on the outer side of the outer ejector post.

[0028] (III) Beneficial effects

[0029] Compared with the prior art, the present invention provides a fixing joint pressing-in device, which has the following beneficial effects:

[0030] 1. In this fixing joint pressing-in device, by setting the fixing device as an inner ejector post and an outer ejector post that are sleeved inside and outside and slide relative to each other, when the outer ejector post abuts against the universal joint, when the inner ejector post continues to press downwards, the side ejector blocks arranged on both sides of the outer ejector post will be pushed outwards. When the position of the universal joint is aligned with the convex key on the shaft rod, when the side ejector blocks bulge outwards, they can accurately insert into the joint fork holes. This sliding bulge structure can not only insert the side ejector blocks into the joint fork holes to fix the universal joint when the universal joint is aligned, preventing the universal joint from jittering, shifting or popping out after being damaged during the subsequent pressing-in process, but also remind the staff of an offset by judging the position of the side ejector blocks when the universal joint is not aligned.

[0031] 2. The fixed joint pressing device is provided with a vertical pressure sensor at the part where the bottom of the mounting seat is connected to the vertical spring. The vertical pressure sensor detects the pressure of the vertical spring in the vertical direction, and then the first hydraulic press is set to two gears, including a positioning gear with a smaller pressure and a pressing gear with a larger pressure. By detecting the pressure of the vertical spring with the vertical pressure sensor, the distance between the mounting seat and the outer ejector pin is judged. When the pressure detected by the vertical pressure sensor exceeds the preset value, that is, when the side ejector block successfully ejects outward, the positioning gear is switched to the pressing gear, thus avoiding damage to the equipment caused by excessive pressure during positioning and resulting in deviation. This structure judges whether the universal joint is in the accurate position and whether the inner ejector pin slides to the predetermined position by judging the position and direction of the side ejector block, so as to start pressing the universal joint after completing all the positioning work.

[0032] 3. The fixed joint pressing device is provided with a horizontal pressure sensor inside the side ejector block and a base with a pressure sensor inside the supporting device. When the pressure detected inside the base increases while the pressure detected inside the horizontal pressure sensor remains unchanged, it indicates that the side ejector block is not aligned with the joint fork hole. Compared with visually observing whether the side ejector block protrudes into the joint fork hole, the detection of the sensor is more accurate and rapid. At the same time, the base can detect the pressure during pressing in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0034] Figure 2 It is a sectional view of the whole of the present invention.

[0035] Figure 3 It is a partial sectional view of the present invention.

[0036] Figure 4 It is a schematic diagram of the structure of the top pressing head of the present invention.

[0037] Figure 5 It is a schematic diagram of the structure of the mounting seat of the present invention.

[0038] Figure 6 It is a schematic diagram of the structure of the outer ejector pin and the side ejector block of the present invention.

[0039] Figure 7 It is a schematic diagram of the structure of the outer ejector pin of the present invention.

[0040] Figure 8 It is a schematic diagram of the structure of the side ejector block of the present invention.

[0041] Figure 9 It is a schematic diagram of the structure of the present invention.

[0042] Figure 10 It is a schematic diagram of the structure of the universal joint of the present invention.

[0043] Figure 11Schematic diagram of the shaft rod structure of the present invention.

[0044] Figure 12 Schematic diagram of the support cylinder structure of the present invention.

[0045] Figure 13 Schematic diagram of the fixing device structure of the present invention.

[0046] Figure 14 Cross-sectional view of the fixing device of the present invention.

[0047] In the figure: 1. Jacking device; 2. Fixing device; 3. Supporting device; 41. Shaft rod; 42. Universal joint; 421. Fork hole.

[0048] 11. First hydraulic press; 12. Jacking head; 121. Mounting seat; 122. Sleeve; 123. Inner jacking column; 124. Outer jacking column; 125. Vertical spring; 126. Side jacking block; 1211. Vertical pressure sensor; 1241. Sliding hole; 1242. Key; 1261. Card slot; 1262. Horizontal spring; 1263. Horizontal pressure sensor; 1264. Sliding inclined plane.

[0049] 31. Base; 32. Support cylinder; 321. Outer cylinder; 322. Inner column.

[0050] 21. Second hydraulic press; 22. Push rod; 23. Cross plate; 24. Chuck; 241. Convex column; 231. Slide groove. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation to the present invention.

[0053] In addition, a fixed connection means a connection where parts or components are fixed without any relative movement; a transmission connection means a connection method that transmits mechanical motion or torque to other working components through transmission parts; a sliding connection means a connection method where two objects are in contact but not fixed and can slide relative to each other; a rotational connection means a connection method where two objects are in contact but not fixed and can rotate relative to each other.

[0054] In addition, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0055] Embodiment 1:

[0056] This embodiment provides a fixed joint pressing device with the following technical features.

[0057] Please refer to Figure 1-14 , a fixed joint pressing device, including a pressing device 1, a fixing device 2, and a supporting device 3. The pressing device 1 includes a first hydraulic press 11 and a pressing head 12. The pressing head 12 includes:

[0058] A mounting seat 121, the top of the mounting seat 121 is connected to the push rod of the first hydraulic press 11 by thread;

[0059] An inner pressing column 123, the bottom of the mounting seat 121 is fixedly connected to the inner pressing column 123 by thread, and the bottom of the inner pressing column 123 is in the shape of a cone or frustum with a narrower bottom and a wider top;

[0060] An outer pressing column 124, the outer pressing column 124 is slidably connected to the outside of the inner pressing column 123, and the top of the outer pressing column 124 is connected to the bottom of the mounting seat 121 by a vertical spring 125;

[0061] A side pressing block 126 is slidably connected in each sliding hole 1241. The end of each side pressing block 126 located inside the outer pressing column 124 is provided with a sliding inclined surface 1264, and the sliding inclined surface 1264 fits with the conical inclined surface at the bottom of the inner pressing column 123.

[0062] In an alternative embodiment, a vertical pressure sensor 1211 is provided at the bottom of the mounting base 121 at the portion connected to the vertical spring 125. The vertical pressure sensor 1211 is used to detect the upward pressure of the vertical spring 125. According to the upward pressure of the vertical spring 125, the distance between the bottom of the mounting base 121 and the top of the outer ejector post 124 can be analyzed. When the inner ejector post 123 slides downward relative to the outer ejector post 124 to a specified distance, that is, after the side ejector block 126 protrudes outward by a certain distance, the vertical pressure sensor 1211 detects that the upward pressure of the vertical spring 125 exceeds a preset value. Thus, the vertical pressure sensor 1211 can determine whether the side ejector block 126 protrudes outward smoothly according to the pressure value, that is, determine whether the universal joint 42 is accurately aligned with the shaft rod 41. The vertical pressure sensor 1211 is connected to control the first hydraulic press 11. When the pressure value detected by the vertical pressure sensor 1211 reaches the preset value, the first hydraulic press 11 is controlled to increase the pressure to press the universal joint 42 into the shaft rod 41.

[0063] In an alternative embodiment, at least one key 1242 is provided on the sliding hole 1241. A slot 1261 is provided on the side ejector block 126 at the position corresponding to the key 1242. A horizontal spring 1262 is provided in the slot 1261. One end of the horizontal spring 1262 is in contact connection with the key 1242, and the other end is fixedly connected to a horizontal pressure sensor 1263 provided inside the side ejector block 126. The horizontal pressure sensor 1263 is used to detect the pressure of the horizontal spring 1262 in the horizontal direction, so as to be able to determine the position of the side ejector block 126;

[0064] The support device 3 includes a base 31 and a support cylinder 32. The support cylinder 32 is used to sleeve outside the bottom of the shaft rod 41. The support cylinder 32 is fixedly connected to the top of the base 31 by bolts. A pressure sensor is provided inside the base 31 for detecting the downward pressure received by the shaft rod 41;

[0065] When the pressure detected inside the base 31 increases while the pressure detected inside the horizontal pressure sensor 1263 remains unchanged, it indicates that the side ejector block 126 is not aligned with the joint fork hole 421. At the same time, the base 31 can detect the pressure during pressing in real time.

[0066] In an alternative embodiment, a housing 122 is provided on the outside of the connection position between the mounting base 121 and the outer ejector post 124. The top of the housing 122 is detachably connected to the bottom of the mounting base 121. The top of the outer ejector post 124 slides in the cavity between the housing 122 and the inner ejector post 123. An exhaust hole is provided on the housing 122, and the exhaust hole communicates the cavity with the outside.

[0067] In an optional embodiment, the support tube 32 includes an outer tube 321 and an inner column 322, there is a gap between the outer tube 321 and the inner column 322, the top of the shaft rod 41 is inserted into the gap between the inner column 322 and the outer tube 321, and the outer side of the inner column 322 is provided with an external spline that fits with the internal spline of the shaft rod 41.

[0068] In an optional embodiment, the fixing device 2 includes a No. 2 hydraulic press 21 fixed on the frame of the pressing device, a slidingly connected push rod 22 is arranged in the No. 2 hydraulic press 21, and a cross plate 23 is fixedly connected to the end of the push rod 22, and slide grooves 231 are arranged on both sides of the cross plate 23. The fixing device 2 also includes only two symmetrical chucks 24, and the end of the chuck 24 close to the No. 2 hydraulic press 21 is rotatably connected in the fixing device 2, and the end of the chuck 24 away from the No. 2 hydraulic press 21 is used to clamp the shaft rod 41. A boss 241 is arranged in the middle position of the chuck 24, and the boss 241 slides in the slide groove 231. When the No. 2 hydraulic press 21 pushes the push rod 22 to move toward the direction of the shaft rod 41, the cross plate 23 pushes the boss 241 to slide through the slide groove 231, so that the end of the chuck 24 away from the No. 2 hydraulic press 21 rotates inward to clamp the shaft rod 41.

[0069] In an optional embodiment, when the push rod 22 moves to the farthest end, that is, the farthest from the second hydraulic press 21, the end of the chuck 24 away from the second hydraulic press 21 is located at an outwardly inclined angle to prevent the chuck 24 from being perpendicular to the cross plate 23 and causing it to get stuck.

[0070] In an optional embodiment, a soft rubber pad is provided on the inner side of one end of the chuck 24 away from the second hydraulic press 21 .

[0071] In an optional embodiment, the bottom of the outer top column 124 and the top surface between the forks of the shaft rod 41 fit each other, and a soft rubber pad is provided at the bottom of the outer top column 124 .

[0072] In an optional embodiment, a chamfer is provided on the end surface edge of the side top block 126 located outside the outer top column 124 .

[0073] In an optional embodiment, a sliding limit structure is provided between the inner top column 123 and the outer top column 124, and the sliding limit structure is used to limit the sliding range of the inner top column 123 in the outer top column 124. The sliding limit structure can be a boss provided on the top side of the inner top column 123. When the inner top column 123 slides downward a certain distance relative to the outer top column 124, that is, after the side top block 126 is pushed out into the yoke hole 421, the boss on the inner top column 123 presses against the top of the outer top column 124, thereby limiting the distance that the side top block 126 is pushed out. At the same time, after the side top block 126 is pushed out, the downward pressure of the mounting seat 121 and the inner top column 123 can be completely output to the outer top column 124.

[0074] In an alternative embodiment, when the first hydraulic press 11 operates, it is set to have two gears, including a positioning gear and a pressing-in gear. When in the positioning gear, the hydraulic pressure output can push the side ejector blocks 126 outwards to both sides. When in the pressing-in gear, the hydraulic pressure output can press the universal joint 42 into the shaft rod 41. When the position of the universal joint 42 is offset, when the side ejector blocks 126 are pushed outwards, they are stuck by the fork part of the universal joint 42. When positioning, the positioning gear is used. At this time, after the side ejector blocks 126 are blocked, the pressure generated by the positioning gear used is not sufficient to damage or eject the universal joint 42.

[0075] Working principle: When the first hydraulic press 11 pushes the pressing head 12 downwards, the bottom of the outer ejector post 124 first abuts against the universal joint 42. At this time, the mounting seat 121 and the inner ejector post 123 continue to press downwards. The conical inclined surface at the bottom of the inner ejector post 123 pushes the side ejector blocks 126 outwards to both sides. When the position of the universal joint 42 is accurate, the side ejector blocks 126 are pushed outwards and inserted into the fork holes 421, so as to fix the universal joint 42 from both sides while pressing down the universal joint 42, preventing the universal joint 42 from popping out or shifting. When the position of the universal joint 42 is offset, the side ejector blocks 126 do not align with the fork holes 421, and when the side ejector blocks 126 are pushed outwards, they are stuck by the fork part of the universal joint 42.

[0076] It should be noted that there is a situation where the universal joint 42 is offset too much, resulting in the side ejector blocks 126 being able to be pushed out smoothly but not being inserted into the fork holes 421. However, since this situation belongs to an extreme case and can be very intuitively detected by the naked eye, most abnormal situations can be detected by judging the position of the side ejector blocks 126.

[0077] In summary, for this fixed joint pressing-in device, by setting the fixing device 2 as the inner ejector post 123 and the outer ejector post 124 which are sleeved inside and outside and slide relative to each other, when the outer ejector post 124 abuts against the universal joint 42, when the inner ejector post 123 continues to press downwards, it will push the side ejector blocks 126 arranged on both sides of the outer ejector post 124 outwards. When the position of the universal joint 42 is aligned with the convex key on the shaft rod 41, when the side ejector blocks 126 bulge outwards, they can accurately be inserted into the fork holes 421. This sliding bulge structure can not only insert the side ejector blocks 126 into the fork holes 421 to fix the universal joint 42 when the universal joint 42 is aligned, preventing the universal joint 42 from jittering, shifting or popping out after being damaged during the subsequent pressing-in process, but also remind the staff of an offset by judging the position of the side ejector blocks 126 when the universal joint 42 is not aligned.

[0078] For this fixed joint pressing device, a vertical pressure sensor 1211 is provided at the part where the bottom of the mounting base 121 is connected to the vertical spring 125. The vertical pressure sensor 1211 detects the pressure of the vertical spring 125 in the vertical direction. Then, the first hydraulic press 11 is set to two gears, including a positioning gear with a smaller pressure and a pressing gear with a larger pressure. The distance between the mounting base 121 and the outer ejector pin 124 is determined by detecting the pressure of the vertical spring 125 with the vertical pressure sensor 1211. When the pressure detected by the vertical pressure sensor 1211 exceeds the preset value, that is, when the side ejector block 126 successfully ejects outward, the positioning gear is switched to the pressing gear, thus avoiding damage to the equipment caused by excessive pressure during positioning and resulting in deviation. This structure determines whether the universal joint 42 is in the accurate position and whether the inner ejector pin 123 slides to the predetermined position by judging the position and direction of the side ejector block 126, and then starts to press the universal joint 42 after completing all the positioning work.

[0079] For this fixed joint pressing device, a horizontal pressure sensor 1263 is provided inside the side ejector block 126, and a base 31 with a pressure sensor is provided inside the support device 3. When the pressure detected inside the base 31 increases while the pressure detected inside the horizontal pressure sensor 1263 remains unchanged, it indicates that the side ejector block 126 is not aligned with the joint fork hole 421. Compared with visually observing whether the side ejector block 126 protrudes into the joint fork hole 421, the detection by the sensor is more accurate and rapid. At the same time, the base 31 can detect the pressure during pressing in real time.

[0080] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0081] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixed joint pressing device, comprising a pressing device (1), a fixing device (2) and a supporting device (3), the fixed joint pressing device being used to press a universal joint (42) into a shaft (41), characterized in that: The jacking device (1) comprises a No. 1 hydraulic press (11) and a jacking head (12), wherein the jacking head (12) comprises: A mounting seat (121), wherein the top of the mounting seat (121) is detachably connected to a push rod of a No. 1 hydraulic press (11); An inner top column (123), the bottom of the mounting seat (121) is fixedly connected to the inner top column (123), and the bottom of the inner top column (123) is in the shape of a cone or a frustum that is narrow at the bottom and wide at the top; An outer top column (124), the outer top column (124) is slidably connected to the outside of the inner top column (123), and the top of the outer top column (124) is connected to the bottom of the mounting seat (121) via a vertical spring (125); A side top block (126), wherein symmetrical sliding holes (1241) are arranged on both sides of the outer top column (124) near the bottom, the side top block (126) is slidably connected in the sliding hole (1241), and a sliding inclined surface (1264) is arranged at the end of the side top block (126) located in the outer top column (124), and the sliding inclined surface (1264) is in contact with the conical inclined surface at the bottom of the inner top column (123); When the outer push column (124) is pressed against the universal joint (42), the inner push column (123) continues to press downward to push out the side push blocks (126) arranged on both sides of the outer push column (124). When the universal joint (42) is located at the convex key on the alignment shaft (41), the side push blocks (126) can be accurately inserted into the yoke hole (421) when they protrude outward.

2. A fixed node press-in device according to claim 1, characterized in that: A vertical pressure sensor (1211) is provided at the bottom of the mounting seat (121) at the portion connected to the vertical spring (125). The vertical pressure sensor (1211) is used to detect the upward pressure of the vertical spring (125). The distance between the bottom of the mounting seat (121) and the top of the outer top column (124) can be analyzed based on the upward pressure of the vertical spring (125).

3. A fixed node press-in device according to claim 2, characterized in that: At least one latching key (1242) is arranged on the sliding hole (1241); a latching slot (1261) is arranged on the side top block (126) at a position corresponding to the latching key (1242); a horizontal spring (1262) is arranged in the latching slot (1261); one end of the horizontal spring (1262) is connected to the latching key (1242) and the other end is connected to a horizontal pressure sensor (1263) arranged in the side top block (126); the horizontal pressure sensor (1263) is used to detect the pressure of the horizontal spring (1262) in the horizontal direction, so as to determine the position of the side top block (126); The support device (3) comprises a base (31) and a support tube (32), wherein the support tube (32) is used to be sleeved on the outside of the bottom of the shaft (41), and the support tube (32) is detachably fixedly connected to the top of the base (31), and a pressure sensor is arranged in the base (31) for detecting the downward pressure exerted on the shaft (41); When the pressure detected in the base (31) increases while the pressure detected in the horizontal pressure sensor (1263) remains unchanged, it indicates that the side top block (126) is not aligned with the yoke hole (421), and the base (31) can detect the pressure during pressing in real time.

4. A fixed node press-in device according to claim 3, characterized in that: A sleeve (122) is provided outside the connection position between the mounting seat (121) and the outer top column (124); the top of the sleeve (122) is detachably connected to the bottom of the mounting seat (121); the top of the outer top column (124) slides in the cavity between the sleeve (122) and the inner top column (123); and an exhaust hole is provided on the sleeve (122), which connects the cavity with the outside.

5. A fixed node press-in device according to claim 3, characterized in that: The support cylinder (32) comprises an outer cylinder (321) and an inner column (322), a gap is present between the outer cylinder (321) and the inner column (322), the top of the shaft rod (41) is inserted into the gap between the inner column (322) and the outer cylinder (321), and an outer side of the inner column (322) is provided with an outer spline that fits with the inner spline of the shaft rod (41).

6. A fixed node press-in device according to claim 3, characterized in that: The fixing device (2) comprises a No. 2 hydraulic press (21) fixed on a frame of the pressing device, a push rod (22) slidably connected is arranged in the No. 2 hydraulic press (21), a cross plate (23) is fixedly connected to the end of the push rod (22), and slide grooves (231) are arranged on both sides of the cross plate (23); The fixing device (2) further comprises only two symmetrical chucks (24), one end of the chuck (24) close to the No. 2 hydraulic press (21) is rotatably connected to the fixing device (2), and the end of the chuck (24) away from the No. 2 hydraulic press (21) is used to clamp the shaft (41). A convex column (241) is provided at the middle position of the chuck (24), and the convex column (241) slides in the slide groove (231). When the push rod (22) is pushed by the No. 2 hydraulic press (21) to move in the direction of the shaft (41), the cross plate (23) pushes the convex column (241) to slide through the slide groove (231), so that the end of the chuck (24) away from the No. 2 hydraulic press (21) rotates inward to clamp the shaft (41).

7. A fixed node press-in device according to claim 6, characterized in that: When the push rod (22) moves to the farthest end, that is, the farthest from the second hydraulic press (21), the end of the chuck (24) away from the second hydraulic press (21) is located at an outwardly inclined angle to prevent the chuck (24) from being stuck due to being perpendicular to the cross plate (23).

8. A fixed node press-in device according to claim 6, characterized in that: A soft rubber pad is provided on the inner side of one end of the chuck (24) away from the second hydraulic press (21).

9. A fixed node press-in device according to claim 3, characterized in that: The bottom of the outer top column (124) and the top surface between the yokes of the shaft rod (41) fit each other, and a soft rubber pad is provided at the bottom of the outer top column (124).

10. A fixed node press-in device according to claim 3, characterized in that: The edge of the end surface of the side top block (126) located outside the outer top column (124) is chamfered.

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