Positioning clamp for assembling left front floor assembly

Abstract

According to the left front floor assembly assembling and positioning clamp, an elastic clamping device of the left front floor assembly assembling and positioning clamp comprises a main body, a trigger switch, a mandrel, a cylindrical spring and a driving element, a plurality of sliding columns are annularly arrayed at the bottom end of the mandrel, a magnetic block is fixed in the mandrel, and all the sliding columns are sucked into the mandrel by the magnetic block in a normal state; a sliding cone is vertically arranged above the sliding column in a sliding manner, and the sliding cone is coaxially mounted in the core shaft in a sliding manner; the main body allows the mandrel to penetrate through in an axial sliding manner, and the mandrel is sleeved with a cylindrical spring connected with the main body; sliding columns are oppositely and elastically installed in the body in a telescopic mode, and limiting plates capable of being attached to the inner sides of the side steel channel beams are fixed to the ends of the sliding columns. The two limiting plates slide to the bottom of the groove of the side steel channel beam to be fixedly connected with the side steel channel beam, then the sliding cone moves downwards to be completely pushed out of the mandrel, the axial thrust on the mandrel is removed, and the sliding cone and the outer bottom face of the side steel channel beam are extruded and attached. According to the method, the assembly postures of all the parts can be rapidly and accurately determined, and the assembly efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of automotive sheet metal fixtures, specifically a positioning fixture for assembling the left front floor assembly. Background Technology

[0002] The structure of a left front floor assembly of a car is as follows: Figures 1-4 As shown, the main components include a base plate, side channel steel beams, crossbeams, and longitudinal beams. The side channel steel beams are attached and fixed to one edge of the base plate, while the crossbeams and longitudinal beams are connected together at angles such as perpendicular to each other and are fixed to the base plate. After the components are properly positioned, they are fixed together by welding or riveting.

[0003] Currently, the assembly fixtures for this type of left front floor assembly mostly involve manually assembling the corresponding components, pressing each component together, and then maintaining its installation posture for subsequent welding or riveting. This operation is extremely cumbersome and heavily relies on the operator's skill level. The assembly positioning accuracy is unstable, resulting in low assembly efficiency. Summary of the Invention

[0004] In light of the above description of the current state of the technology, the purpose of this invention is to provide a positioning fixture for assembling the left front floor assembly, so as to better solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention employs a left front floor assembly positioning fixture, comprising an elastic clamp for clamping the side channel steel beam. The elastic clamp includes a main body, a trigger switch, a spindle, a cylindrical spring, and a driving element. Several sliding posts are arranged in a circular array at the bottom end of the spindle. A magnetic block is fixed axially upward on the spindle. Under normal conditions, the magnetic block draws all the sliding posts into the spindle. A sliding cone is vertically slidably positioned above the sliding posts, coaxially slidably mounted within the spindle. When the sliding cone moves vertically downward, it can fit over the magnetic block and push all the sliding posts outward. The main body allows the spindle to slide axially through it, and a spring elastically connected to the main body is sleeved on the spindle. The cylindrical spring is connected to the main body; a sliding column is elastically and telescopically installed inside the main body, and a limiting plate is fixed at the end of the sliding column to fit against the inner side of the side channel steel beam; the mandrel is connected to a driving element so that it can move the main body downward when sliding axially, and make the two limiting plates slide to the bottom of the groove of the side channel steel beam and fix them to the side channel steel beam. Then the mandrel continues to move axially, causing a trigger switch below the main body to drive the sliding cone to move downward, so as to push all the sliding cones located outside the bottom of the side channel steel beam out of the mandrel. At this time, the driving element removes the axial thrust on the mandrel, and the cylindrical spring pulls the mandrel to the position where the sliding cone and the outer bottom surface of the side channel steel beam are pressed and fitted together.

[0006] Further, the end of the sliding cone is coaxially fixed with a sliding rod which is slidingly installed in the mandrel, the magnetic block is fixed on a mounting rod in the mandrel, when the sliding cone moves axially, it can be sleeved outside the sliding rod and the magnetic block.

[0007] Further, the end of the sliding column towards the center of the mandrel is a convex spherical structure, the spherical structure is used for sliding contact with the side surface of the sliding cone, the large end of the sliding cone is coaxially integrated with a cylindrical part, when the side surface of the cylindrical part is in contact with the top center of the spherical structure, the sliding column extends to the limit length.

[0008] Further, the sliding column is hollow inside, the sliding column is of a rectangular cross-section structure, the magnetic block is cylindrical, and the midpoint thereof is located at the midpoint of the line connecting two opposite sliding columns.

[0009] Further, the trigger switch comprises an upper contact ring and a lower contact ring which are coaxially arranged on the mandrel and can axially slide, the upper contact ring is installed at the bottom of the main body, the lower contact ring is connected with the bottom of the main body through a connecting spring and is kept in a normal state, the two contact rings do not contact each other, when the mandrel moves downward and the sliding columns are all located outside the bottom of the side channel steel beam, the two contact rings contact each other, and then one pushing element axially moves with the sliding rod to the sliding cone to push all the sliding columns to the limit position.

[0010] Further, the inner bottom of the lower contact ring is closed to form a groove, one end of the connecting spring is installed in the groove.

[0011] Further, the main body comprises a base, a support rod and a sleeve cover which are sequentially fixed, the base and the sleeve cover are used for the mandrel to axially slide through; an axle ring is fixed on the mandrel, the upper end surface of the axle ring is elastically connected with the bottom end of the sleeve cover through the cylindrical spring; a transmission arm is fixed on one side of the mandrel, the transmission arm is vertically slidingly installed on one side of the sleeve cover and extends out of the sleeve cover to be in transmission contact with the driving element above; the pushing element and the driving element are both hydraulic cylinders, so that when the piston rod of each hydraulic cylinder extends, the mandrel or the sliding rod can be axially moved.

[0012] Further, it further comprises a plurality of pairs of hydraulic telescopic columns which are spaced apart and opposite to each other, the output end of each hydraulic telescopic column is fixed with a positioning disc, the positioning disc is coaxially provided with a positioning column in the center, when the two opposite hydraulic telescopic columns move towards each other, they are coaxially inserted into the through hole at the edge of the main plate, and the two positioning discs clamp the base plate.

[0013] Further, it further comprises two clamping mechanisms, the clamping mechanism comprises a bidirectional screw rod which rotates in place driven by a motor, the bidirectional screw rod is installed in a mounting seat, and two clamping plates are threadedly connected with the bidirectional screw rod, when the motor is started, the two clamping plates move axially along the bidirectional screw rod to move towards each other in the width direction of the longitudinal beam or the cross beam to clamp the corresponding beam.

[0014] Further, the positioning rod is elastically installed in the middle of the mounting base towards the side of the clamping plate by extrusion spring, and the positioning rod is perpendicular to the bidirectional screw rod. When the longitudinal beam or the transverse beam is clamped, the positioning rod is first inserted into the through hole on the corresponding beam, and the two clamping plates clamp the beam only when the positioning rod is inserted into the through hole and the limiting disc is finally extruded into contact with the surface of the corresponding beam.

[0015] The left front floor assembly assembling positioning clamp of the present application clamps and fixes the side channel steel beam which is most difficult to clamp and fix by using the elastic clamp, preliminarily positions the round hole at the bottom of the side channel steel beam, clamps and fixes the side channel steel beam accurately and quickly by cooperating with the two limiting plates which are elastically installed in the recess, obtains the assembling and positioning attitude, and has the buffering and damping effect in the width direction and the depth direction of the side channel steel beam, so that the deformation of the side channel steel beam is avoided on the basis of maintaining the close contact between the side channel steel beam and the base plate. When the left front floor assembly is assembled and fixed, the elastic clamp can be pulled out.

[0016] In addition, the base plate is clamped and fixed by using the two hydraulic telescopic columns with the positioning disc and the positioning column, so that the base plate is quickly fixed to the corresponding attitude. In addition, the pair of clamping plates driven by the bidirectional screw rod can clamp and position the corresponding transverse beam and longitudinal beam to the corresponding mounting attitude under the cooperation of the positioning rod and the limiting disc, so as to be fixed and connected with the base plate. The structure is simple, the parts to be connected are automatically clamped and fixed, and the work efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0017] The following is some specific embodiment illustrated in the present specification for the purpose of explaining the present application, and the description of the drawings mainly describes the principle of the specific operation execution structure or method of some embodiments of the present application, but this does not mean that the physical structure or operation steps of the present application can only be shown in the drawings.

[0018] Figures 1-3 is the perspective structural schematic diagram of the left front floor assembly in the present application;

[0019] Figure 4 is the cooperation structure diagram of the transverse beam and the longitudinal beam;

[0020] Figure 5 is the perspective structural schematic diagram of the left front floor assembly in the present application; Figure 2 is the clamp structure diagram of the left front floor assembly assembling positioning clamp for clamping the side channel steel beam from the left side of the structure shown in the figure;

[0021] Figure 6 is the sectional view of the core shaft at the bottom end;

[0022] Figure 7 is the schematic diagram of all sliding columns extending out of the core shaft;

[0023] Figure 8 From Figure 2 A schematic diagram of the clamp used to clamp the substrate, viewed from the left side of the structure shown.

[0024] Figure 9 From Figure 2 The diagram shows the structure of the clamp used to clamp the crossbeam, viewed from the left side of the structure shown.

[0025] Figure 10 From Figure 2 The diagram shown is a simplified representation of the left front floor assembly positioning fixture of the present invention, viewed from the left side.

[0026] Component labeling: Main body 1, Sleeve cover 101, Support rod 102, Base 103, Mandrel 2, Cylindrical spring 3, Shaft collar 4, Sliding column 5, Limiting plate 6, Sliding column 7, Sliding cone 8, Sliding rod 9, Magnetic block 10, Mounting rod 11, Pushing element 12, Driving element 13, Transmission arm 14, Upper contact ring 15, Lower contact ring 16, Connecting spring 17, Hydraulic telescopic column 18, Positioning plate 19, Positioning column 20, Motor 21, Bidirectional lead screw 22, Clamping plate 23, Positioning rod 24, Limiting plate 25, Telescopic rod 26, Frame 27, Mounting seat 28, Side channel steel beam A, Base plate B, Crossbeam C, Longitudinal beam D, First round hole A1, Second round hole A2, First through hole B1, Second through hole B2, First through hole C1, Second through hole C2, Third through hole D1. Detailed Implementation

[0027] The embodiments of the present invention will be fully described below. Some core features of the embodiments will be specifically illustrated in the accompanying drawings, wherein the same or similar reference numerals in the drawings represent the same or similar technical features, or structures, steps, or processes with similar functions. Other embodiments derived by those skilled in the art based on these embodiments without requiring creative effort are also within the protection scope of the present invention.

[0028] Please see Figures 1-4 This embodiment specifically illustrates the left front floor assembly that needs to be clamped. The left front floor assembly assembly positioning fixture used in this embodiment for clamping and positioning the various parts of this left front floor assembly mainly includes an elastic clamp for clamping the side channel steel beam A, such as... Figures 5-7As shown, this elastic clamp includes a main body 1, a trigger switch, a spindle 2, a cylindrical spring 3, and a drive element 13. Several sliding posts 7 are arranged in a ring at the bottom end of the spindle 2, typically three or four. A magnetic block 10 is fixed axially on the spindle 2, possessing magnetic attraction. Under normal conditions, the magnetic block 10 draws all the sliding posts 7 into the spindle 2, keeping all the sliding posts 7 retracted into the spindle 2. A sliding cone 8 is vertically slidably mounted above the sliding posts 7. The sliding cone 8 is coaxially slidably installed inside the spindle 2 and can slide vertically. When the sliding cone 8 moves vertically downwards, it can fit over the magnetic block 10 and press against the ends of the corresponding sliding posts 7, thereby pushing all the sliding posts 7 outwards, achieving the purpose of extending all the sliding posts 7. In this embodiment, this mainly occurs after the bottom of the side channel steel beam A of the left front floor assembly is passed through the bottom of the spindle 2, i.e., after passing through... Figure 3 For example, two sets of elastic clamps are needed to clamp the first circular hole A1 and the second circular hole A2 respectively. These sliding posts 7 only extend after passing through the bottom of the side channel steel beam A to avoid detaching from the side channel steel beam A. More specifically, in this embodiment, the main body 1 allows the mandrel 2 to slide axially through it. A cylindrical spring 3, elastically connected to the main body 1, is sleeved on the mandrel 2 to achieve an elastic connection. Furthermore, a sliding post 5 is elastically telescopically installed inside the main body 1. A limiting plate 6, which can fit against the inner side of the side channel steel beam A, is fixed to the end of the sliding post 5. The limiting plate 6 can be a small steel plate section with a length of 3-5 cm. In the above embodiments, the mandrel 2 is connected to a driving element 13, which drives the mandrel 2 to move axially, for example, downwards, so that during axial sliding, the cylindrical spring 3 pulls the main body 1 downwards. During this period, the two limiting plates 6 can slide to the bottom of the groove of the side channel steel beam A and be fixed to the side channel steel beam A. That is, due to the elastic telescopic installation of the sliding column 5, it can be abutted and locked in the groove of the side channel steel beam A, thereby achieving a fixed connection with the side channel steel beam A. In addition, in order to make the connection of the side channel steel beam A more stable, after the limiting plate 6 is locked in the side wall of the groove, the mandrel 2 continues to move axially, and the cylindrical spring 3 continues to be stretched, thereby triggering a trigger switch below the main body 1. This trigger switch then drives the sliding cone 8 to move downwards, such as... Figure 7 When the sliding cone 8 moves downward, it will push all the sliding columns 7 to extend synchronously, so that all the sliding cones 8 located outside the bottom of the side channel steel beam A will be pushed out of the mandrel 2. At this time, it should be noted that when the driving element 13 removes the axial thrust on the mandrel 2, for example, when the driving element 13 is a hydraulic cylinder, the piston rod retracts and releases the mandrel 2. The cylindrical spring 3 will pull the mandrel 2 upward due to the reset tendency. During the upward movement, the sliding cones 8 that have already extended inside the mandrel 2 and the outer bottom surface of the side channel steel beam A will be pressed and adhered, thereby clamping the side channel steel beam A further along the depth direction of its groove together with the limiting plate 6.

[0029] In the above embodiments, such as Figures 5-7As shown, a sliding rod 9 is coaxially fixed at the end of the sliding cone 8, and the sliding rod 9 is slidingly installed in the mandrel 2. In actual production, the magnetic block 10 is fixed on a mounting rod 11 in the mandrel 2. When the sliding cone 8 moves axially, i.e. moves downward, it can be sleeved outside the sliding rod 9 and the magnetic block 10, and then pushes all the sliding columns 7 to extend, and the pushing element 12 connected with the sliding rod 9 can be adaptively extended and retracted with the axial movement of the sliding rod 9, and the sliding rod 9 is pushed upward, and if necessary, the sliding rod 9 is pulled upward to reset.

[0030] In order to facilitate contact with the sliding cone 8, as shown, Figures 6-7 the end of the sliding column 7 towards the center of the mandrel 2 is a convex spherical structure, and the spherical structure is used for sliding contact with the side surface of the sliding cone 8. The large end of the sliding cone 8 is coaxially integrated with a cylindrical part 801, and when the side surface of the cylindrical part 801 contacts the top center of the spherical structure, the sliding column 7 extends to the limit length. In order to reduce the pushing force, the sliding column 7 is hollow inside, and the sliding column 7 is a rectangular structure in cross section, which can well fit the corresponding surface of the side channel steel beam A. In this embodiment, the magnetic block 10 is cylindrical, and the midpoint thereof is located at the midpoint of the line connecting the two opposite sliding columns 7, so that in the normal state, all the sliding columns 7 can be attracted into the corresponding position in the mandrel 2.

[0031] In this embodiment, as shown, Figure 5 the trigger switch includes an upper contact ring 15 and a lower contact ring 16 which are coaxially arranged on the mandrel 2 and can axially slide. The upper contact ring 15 is installed at the bottom of the main body 1, and the lower contact ring 16 is connected with the bottom of the main body 1 through a connecting spring 17 and keeps in a normal state, and the two contact rings do not contact each other, i.e. the two contacts in an electric circuit do not contact each other, and once the contact ring contacts a device controlled by the corresponding circuit, the device is started. In this embodiment, the device is the pushing element 12 for pushing the sliding rod 9 to move axially, for example, a hydraulic cylinder. When the mandrel 2 moves downward, the sliding cone 8 moves downward to the set position, and then the sliding end of the mandrel 2 slides to the position where all the sliding columns 7 are located outside the bottom of the side channel steel beam A, and then the two contact rings contact each other, i.e. the two contacts contact each other, and the pushing element 12 is started, for example, the piston rod of the hydraulic cylinder extends, as shown in Figure 7 , and then the piston rod moves axially downward with the sliding rod 9 to the position where all the sliding columns 7 are pushed to the limit. In order to install and avoid overloading of the connecting spring 17, the inner bottom of the lower contact ring 16 is closed to form a groove, and one end of the connecting spring 17 is installed in the groove.

[0032] In the above embodiment, as shown, Figure 5As shown, the main body 1 comprises a base 103, a support rod 102 and a sleeve cover 101 fixed in sequence, and the three are fixedly connected, wherein the base 103 and the sleeve cover 101 are for the shaft 2 to slide axially through. In order to realize elastic connection, more specifically, a shaft ring 4 is fixed on the shaft 2, and the upper end face of the shaft ring 4 is elastically connected with the bottom end of the sleeve cover 101 through a cylindrical spring 3, so that when the shaft 2 moves downward, the main body 1 moves downward, and then the limiting plate 6 moves downward. More specifically, one side of the shaft 2 is fixed with a transmission arm 14 which is vertically slidably installed on one side of the sleeve cover 101 and extends out of the sleeve cover 101 to be in transmission contact with the driving element 13 above the sleeve cover 101. When the piston rod of the driving element 13 such as a hydraulic cylinder moves downward, the transmission arm 14 is pushed to move downward, and then the shaft 2 moves downward.

[0033] As another embodiment, as shown in Figure 8 and Figure 10 , it further comprises a plurality of pairs of hydraulic telescopic columns 18 which are spaced apart and opposite to each other, and the output end of each hydraulic telescopic column 18 is fixed with a positioning disc 19 which has a positioning column 20 coaxially in the center, and when the two opposite hydraulic telescopic columns 18 move towards each other, they are coaxially inserted into the through holes at the edge of the main plate member, and here the through holes are, for example, the first through hole B1 and the second through hole B2 shown in Figure 2 , and it is appropriate to select two relatively far apart through holes, and the two positioning discs 19 clamp the base plate B, and then realize the fixation of the base plate B.

[0034] As still another embodiment, it further comprises at least two clamping mechanisms, such as Figures 9-10 , the clamping mechanism comprises a bidirectional screw rod 22 driven by a motor 21 to rotate in place, the bidirectional screw rod 22 is installed in a mounting seat 28 which can be a rectangular column, and two clamping plates 23 are threadedly connected on the bidirectional screw rod 22, the moving directions of the two clamping plates 23 are opposite, and when the motor 21 is started, the two clamping plates 23 move axially along the bidirectional screw rod 22, thereby moving towards each other from the respective width directions of the stringers D or the cross beams C to clamp the corresponding beams, thereby clamping and fixing the stringers D and the cross beams C. In the above embodiment, in order to quickly position the beams, as shown in Figure 9 , a positioning rod 24 is elastically and resiliently installed in the center of the mounting seat 28 towards the clamping plate 23 side through a compression spring, the positioning rod 24 is perpendicular to the bidirectional screw rod 22, and when the stringers D or the cross beams C are clamped, the positioning rod 24 is first inserted into the through hole on the corresponding beam, and here the through hole is, for example, the first through hole C1 and the second through hole C2 in Figure 2 , and the third through hole D1 on the stringer D, and when the positioning rod 24 is inserted into the through hole and the limiting disc 25 is finally in pressing contact with the surface of the corresponding beam, the two clamping plates 23 clamp the beam, thereby realizing quick positioning and fixation.

[0035] In all the above embodiments, the mounting of the corresponding clamps for each part can be made adaptively, or all the clamps can be integrated on a rack 27, and corresponding telescopic cylinders are arranged on the rack 27 to realize the movement of the corresponding clamps, so that the parts clamped by each clamp can be close to each other and fit together for welding assembly and other fixing operations.

[0036] The above series of specific implementation details only show some preferred embodiments in the inventive concept, and cannot limit the protection scope of the claims of the present application. Based on the understanding of the above embodiments, the person skilled in the art can simply change the design idea by referring to the basic principles recorded in the claims of the present application, but these changed designs still belong to the protection scope of the invention.

Claims

1. A left front floor assembly assembly positioning fixture, characterized by, The utility model provides a flexible clamp for clamping side channel steel beam, the flexible clamp includes main body (1), trigger switch, mandrel (2), cylindrical spring (3), drive element (13), the mandrel (2) has a plurality of sliding column (7) at the annular array of bottom end, the axial fixed magnet block (10) of mandrel (2), the magnet block (10) is in normal state and inhale all sliding column (7) into mandrel (2), sliding cone (8) is vertically slidably arranged above sliding column (7), sliding cone (8) is coaxially slidably installed in mandrel (2), sliding cone (8) can be sleeved outside the magnet block (10) when vertically descending, and all sliding column (7) is pushed out outwardly, The main body (1) is axially slidably passed through the mandrel (2), and the cylindrical spring (3) is sleeved on the mandrel (2) and elastically connected with the main body (1); the sliding column (5) is elastically and oppositely installed in the main body (1), and the end of the sliding column (5) is fixedly connected with the limiting plate (6) which can be attached to the inner side of the side channel steel beam; the mandrel (2) is connected with the drive element (13) so as to axially slide with the main body (1) and make the two limiting plates (6) slide to the groove bottom of the side channel steel beam and be fixedly connected with the side channel steel beam, and then the mandrel (2) continues to axially move to make the trigger switch below the main body (1) drive the sliding cone (8) to descend to push all the sliding cone (8) outside the mandrel (2) out of the mandrel (2), at this time, the drive element (13) removes the axial thrust of the mandrel (2), and the cylindrical spring (3) pulls the mandrel (2) to the position where the sliding cone (8) and the outer bottom surface of the side channel steel beam are extruded and attached.

2. A left front floor assembly assembly positioning fixture as claimed in claim 1, wherein, The end of the sliding cone (8) is coaxially fixed with the slide rod (9) which is slidably installed in the mandrel (2), and the magnet block (10) is fixed on the mounting rod (11) in the mandrel (2), and when the sliding cone (8) axially moves, the sliding cone (8) can be sleeved outside the slide rod (9) and the magnet block (10).

3. A left front floor assembly assembly positioning fixture according to claim 2, wherein, The end of the sliding cone (8) is coaxially fixed with the slide rod (9) which is slidably installed in the mandrel (2), and the magnet block (10) is fixed on the mounting rod (11) in the mandrel (2), and when the sliding cone (8) axially moves, the sliding cone (8) can be sleeved outside the slide rod (9) and the magnet block (10).

4. A left front floor assembly assembly positioning fixture according to claim 3, wherein, The end of the sliding cone (8) is coaxially fixed with the slide rod (9) which is slidably installed in the mandrel (2), and the magnet block (10) is fixed on the mounting rod (11) in the mandrel (2), and when the sliding cone (8) axially moves, the sliding cone (8) can be sleeved outside the slide rod (9) and the magnet block (10). The inside of the sliding column (7) is hollow, the sliding column (7) is rectangular in cross section, the magnet block (10) is cylindrical, and the midpoint of the magnet block (10) is located at the midpoint of the line connecting the two opposite sliding columns (7).

5. A left front floor assembly assembly positioning fixture as claimed in claim 1, wherein, The trigger switch comprises coaxially arranged upper and lower contact rings (15, 16) on the core shaft (2) and capable of axial sliding, the upper contact ring (15) is installed on the bottom of the main body (1), the lower contact ring (16) is connected with the bottom of the main body (1) through a connecting spring (17) and is kept in a normal state, the two contact rings are not in contact with each other, when the core shaft (2) moves downward to the position where the sliding columns (7) are all located outside the bottom of the side channel steel beam, the two contact rings are in contact with each other, and then one pushing element (12) with the sliding rod (9) moves axially to the sliding cone (8) to push all the sliding columns (7) to the extreme position.

6. A left front floor assembly assembly positioning fixture as claimed in claim 5, wherein, The inner bottom of the lower contact ring (16) is closed to form a groove, and one end of the connecting spring (17) is installed in the groove.

7. A left front floor assembly assembly positioning fixture as claimed in claim 5, wherein, The main body (1) comprises a base (103), a support rod (102) and a sleeve cover (101) which are sequentially fixed, the base (103) and the sleeve cover (101) are provided for the core shaft (2) to axially slide through; an annular flange (4) is fixed on the core shaft (2), the upper end surface of the annular flange (4) is elastically connected with the bottom end of the sleeve cover (101) through the cylindrical spring (3); a transmission arm (14) is fixed on one side of the core shaft (2), the transmission arm (14) is vertically slidably installed on one side of the sleeve cover (101) and extends out of the sleeve cover (101) to be in transmission contact with the driving element (13) above the sleeve cover (101); The pushing element (12) and the driving element (13) are both hydraulic cylinders, so that when the piston rod of each hydraulic cylinder extends, the core shaft (2) or the sliding rod (9) can be axially moved.

8. A left front floor assembly assembly positioning fixture as claimed in claim 1, wherein, A plurality of pairs of hydraulic telescopic columns (18) are also included, the output end of each hydraulic telescopic column (18) is fixed with a positioning disc (19), the positioning disc (19) is coaxially provided with a positioning column (20) in the center, when the two pairs of hydraulic telescopic columns (18) are close to each other, the two pairs of hydraulic telescopic columns (18) are coaxially inserted into the through holes at the edge of the main plate, and the two positioning discs (19) clamp the main plate.

9. A left front floor assembly assembly positioning fixture as claimed in claim 1, wherein, Two clamping mechanisms are also included, the clamping mechanism comprises a bidirectional screw rod (22) which is driven by a motor (21) to rotate in place, the bidirectional screw rod (22) is installed in a mounting seat (28), and two clamping plates (23) are threadedly connected with the bidirectional screw rod (22), when the motor (21) is started, the two clamping plates (23) move axially along the bidirectional screw rod (22) to close to each other from the respective width directions of the longitudinal beams or the cross beams to clamp the corresponding beams.

10. A left front floor assembly assembly positioning fixture as claimed in claim 9, wherein, A positioning rod (24) is elastically installed in the center of the mounting seat (28) on the side of the clamping plate (23) by extrusion spring, the positioning rod (24) is perpendicular to the bidirectional screw rod (22), when the longitudinal beams or the cross beams are clamped, the positioning rod (24) is first inserted into the through hole in the corresponding beam, when the positioning rod (24) is inserted into the through hole and the limiting disc (25) is finally extruded into contact with the surface of the corresponding beam, the two clamping plates (23) clamp the corresponding beam.

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