CN207259084U - A kind of transfer pallet fork elevator and the vehicle production line using the elevator - Google Patents

Abstract

The utility model relates to a lifter for moving cargo forks and a vehicle production line using the lifter. It includes a transfer fork lift that realizes the handover and conversion of the two-station car body. The lift includes at least one pair of guide columns, each pair includes two left and right guide columns, and two rails extending up and down are respectively arranged on the front and rear sides of each , There is a lifting frame between the guide columns. The lifting frame is equipped with four matching parts that are respectively matched with the track guide movement. The lifting frame is also equipped with a transfer fork. The top of the elevator is equipped with a pulley block. One end of the traction software is connected with the lifting frame, the other end is connected with the counterweight in the guide column, and the driving device is also included. The utility model has fast lifting speed and high lifting efficiency. Compared with the scissors and fork mechanism composed of mutually hinged connecting rods, the guide column is still very stable even when the height of the guide column is high, so a very high height can be set. So as to meet the scene of handover and conversion of the vehicle body with a high drop such as different floors.

Description

A kind of moving goods fork lift and the vehicle production line using the lift

technical field

The utility model relates to a lifter for moving cargo forks and a vehicle production line using the lifter.

Background technique

In the existing automobile production line, due to the need to change the car body between different conveying methods and different processes, it is usually necessary to use transfer equipment for transfer. Traditional transfer equipment mostly uses scissor-fork jacks and transfer forks. , the transfer fork is installed on the lifting platform of the jacking machine, the moving fork can hold the vehicle body and move telescopically, and use the jacking machine for lifting. The Chinese patent application publication number CN105905500A is a common The jacking machine, the jacking machine includes a base and a lifting platform, and a driving motor and a lifting mechanism connected with the driving motor are installed on the base. A number of telescopic connection units between the bases, the connection unit includes two oppositely arranged connecting rod assemblies, the connecting rod assembly includes two connecting rods crossed and hinged to form a cross, and a cross bar is arranged between the two connecting rod assemblies, because the lifting platform is It is supported and lifted by multiple hinged connecting rods, and the hinged connecting rods are very unstable during the jacking process, and may even shake. When this type of jack is high, more connecting rods are bound to be required. The connecting unit makes the lifting platform more unstable. Due to the above restrictions, the lifting height of the traditional jacking machine will not be set too high, which is no longer applicable to application scenarios such as body transfer between different floors, and the above The lifting speed of the scissor-fork lifting machine will not be too fast, which will affect the transfer efficiency of the product, and ultimately affect the production efficiency of the entire production line.

Utility model content

The purpose of this utility model is to provide a kind of transfer fork lift that can improve the efficiency of product jacking and is still very stable when used in a scene with a high jacking height; the purpose of this utility model is also to provide a The vehicle production line that transfers the forklift.

In order to achieve the above purpose, the utility model transfer forklift adopts the following technical solutions:

Technical solution 1: The load-shifting forklift includes at least one pair of guide pillars, each pair of guide pillars includes two guide pillars arranged on the left and right, and two first extending up and down are respectively arranged on the sides of the front and rear sides of each guide pillar. There is a lifting frame between the track and the guide column. The lifting frame is equipped with four first matching parts that are respectively matched with the first track guide movement. Fork, the top of the moving fork lift is also provided with a pulley block, and the pulley block is wound with traction software. One end of the traction software is connected with the lifting frame, and the other end is connected with the counterweight in the guide column. The moving fork lift also includes a drive The driving device that pulls the soft body to drive the lifting frame up and down. The utility model adopts the guide column as the guiding reference, and under the traction of the pulley block and the traction software, the lifting frame directly lifts up and down along the guide column. Compared with the traditional scissor-fork type jacking mechanism, the lifting speed is fast and the jacking efficiency is high. Compared with the scissor-fork mechanism composed of hinged connecting rods, the guide post is still very stable even when the height of the guide post is high, so a high height can be set to meet the transfer and conversion of the car body with high drop between different floors. scene.

Technical solution 2: On the basis of technical solution 1, U-shaped frames are respectively provided on both sides of the lifting frame close to the guide column, and the upper and lower sets of first matching parts are respectively provided on the two sides of the U-shaped. The structure of the U-shaped frame is simple and very firm.

Technical solution 3: On the basis of technical solution 1 or 2, the first track is a rectangular bar, and the first fitting part is respectively movable and matched with three sides of the rectangular bar. The three sides are matched so that it can be carried on three sides, which is more stable.

Technical solution 4: On the basis of technical solution 3, the rectangular bar is a square steel bar, and the first matching part rolls and cooperates with three sides of the square steel bar through three rollers. The rolling fit not only has a small frictional force for movement, but also does not affect the force bearing of the three sides.

Technical solution 5: On the basis of technical solution 4, the telescopic direction of the fork is perpendicular to the direction of the line between the two guide posts, and there is a space between the two guide posts to accommodate the goods when the goods are retracted by the transfer fork. of accommodation space.

Technical solution 6: On the basis of technical solution 5, the two sides of the accommodation space are respectively provided with handover positions for handover of goods, and the transfer fork can be stretched between the two handover positions in the accommodation space. Such an arrangement can ensure that the handover and conversion of the car body can be transferred from the production line on one side of the lift to the production line on the other side of the lift, or can realize the handover and change between different stations on both sides of the lift.

Technical solution 7: On the basis of any one of technical solutions 4-6, the pulley block includes two pulleys, and the two pulleys are respectively arranged on opposite sides of the lifting frame. The traction software has two groups, and each group has two One set of traction software bypasses the first pulley and connects to one side of the lifting frame, the other set bypasses the two pulleys and connects to the other side of the lifting frame, and the other end of the two sets of traction software connects to the distribution Heavy. The setting of the counterweight can balance the gravity of a part of the lifting frame and the car body, so that the driving force required to output the driving motor is correspondingly reduced. The setting method of the two sets of traction software and the connection method with the lifting frame and the counterweight not only facilitate the driving The drive is convenient, and it is convenient to balance the weight of the lifting frame, and the structure is very ingenious.

Technical solution 8: On the basis of technical solution 1 or 2, the guide column is a shell structure, and the inside of the shell is guided by guide wheels to assemble the counterweight. The counterweight is installed in the guide post of the shell structure, so that the counterweight no longer occupies a limited space, and it also saves space when there are only two guide posts. There is an inspection hole at the bottom of the column for inspection and easy adjustment of the belt or chain.

Technical solution 9: On the basis of technical solution 8, the guide column is a rectangular shell structure, and four sets of the guide wheels are provided on the upper and lower sides of the counterweight, and the four sets of guide wheels are respectively connected with the rectangular shell structure. The four corner guides of the cavity move to fit. The rectangular structure cooperates with the guide wheels set at the four corners, so that the counterweight will only rise along the guide column and will not rotate by itself.

Technical solution 10: On the basis of technical solution 9, the traction software is a belt, and the pulley is a drum that can be wound by the belt. The belt is embedded with a steel wire rope, the belt has a large bearing capacity and a small deformation, and it is very convenient to cooperate with the roller.

Technical solution 11: On the basis of technical solution 10, the driving device is a geared motor, and the output shaft of the geared motor is connected to the first pulley to drive two sets of traction software to move synchronously.

Technical solution 12: On the basis of technical solution 1 or 2, second rails are provided on the opposite and opposite sides of the two guide columns, and two second rails are also provided on the lifting frame to cooperate with the guide movement of the second rails. The second matching part, the second track is a rectangular bar, and the second matching part includes three rollers respectively rolling and cooperating with the three sides of the rectangular bar.

The vehicle production line of the utility model adopts the following technical solutions:

Technical solution 1: The vehicle production line includes two high and low stations and a transfer forklift for realizing the handover and conversion of the body between the two stations. The transfer forklift includes at least A pair of guide pillars, each pair of guide pillars includes two guide pillars arranged left and right, two first rails extending up and down are respectively arranged on the sides of the front and rear sides of each guide pillar, and a lifting frame is arranged between the guide pillars, The lifting frame is provided with four first cooperating parts which respectively cooperate with the first rail guiding movement, and the lifting frame is also provided with a horizontally telescopic moving fork for transferring goods. The top of the moving fork lifter is also There is a pulley block, and traction software is wound on the pulley block. One end of the traction software is connected to the lifting frame, and the other end is connected to the counterweight in the guide column. The moving fork lift also includes a driving device that drives the movement of the traction software to drive the lifting frame up and down. . The utility model adopts the guide column as the guiding reference, and under the traction of the pulley block and the traction software, the lifting frame directly lifts up and down along the guide column. Compared with the traditional scissor-fork type jacking mechanism, the lifting speed is fast and the jacking efficiency is high. Compared with the scissor-fork mechanism composed of hinged connecting rods, the guide post is still very stable even when the height of the guide post is high, so a high height can be set to meet the transfer and conversion of the car body with high drop between different floors. scene.

Technical solution 2: On the basis of technical solution 1, U-shaped frames are respectively provided on both sides of the lifting frame close to the guide column, and the upper and lower sets of first matching parts are respectively provided on the two sides of the U-shaped. The structure of the U-shaped frame is simple and very firm.

Technical solution 3: On the basis of technical solution 1 or 2, the first track is a rectangular bar, and the first fitting part is respectively movable and matched with three sides of the rectangular bar. The three sides are matched so that it can be carried on three sides, which is more stable.

Technical solution 4: On the basis of technical solution 3, the rectangular bar is a square steel bar, and the first matching part rolls and cooperates with three sides of the square steel bar through three rollers. The rolling fit not only has a small frictional force for movement, but also does not affect the force bearing of the three sides.

Technical solution 5: On the basis of technical solution 4, the telescopic direction of the fork is perpendicular to the direction of the line between the two guide posts, and there is a space between the two guide posts to accommodate the goods when the goods are retracted by the transfer fork. of accommodation space.

Technical solution 6: On the basis of technical solution 5, the two sides of the accommodation space are respectively provided with handover positions for handover of goods, and the transfer fork can be stretched between the two handover positions in the accommodation space. Such an arrangement can ensure that the handover and conversion of the car body can be transferred from the production line on one side of the lift to the production line on the other side of the lift, or can realize the handover and change between different stations on both sides of the lift.

Technical solution 7: On the basis of any one of technical solutions 4-6, the pulley block includes two pulleys, and the two pulleys are respectively arranged on opposite sides of the lifting frame. The traction software has two groups, and each group has two One set of traction software bypasses the first pulley and connects to one side of the lifting frame, the other set bypasses the two pulleys and connects to the other side of the lifting frame, and the other end of the two sets of traction software connects to the distribution Heavy. The setting of the counterweight can balance the gravity of a part of the lifting frame and the car body, so that the driving force required to output the driving motor is correspondingly reduced. The setting method of the two sets of traction software and the connection method with the lifting frame and the counterweight not only facilitate the driving The drive is convenient, and it is convenient to balance the weight of the lifting frame, and the structure is very ingenious.

Technical solution 8: On the basis of technical solution 1 or 2, the guide column is a shell structure, and the inside of the shell is guided by guide wheels to assemble the counterweight. The counterweight is installed in the guide post of the shell structure, so that the counterweight no longer occupies a limited space, and it also saves space when there are only two guide posts. There is an inspection hole at the bottom of the column for inspection and easy adjustment of the belt or chain.

Technical solution 9: On the basis of technical solution 8, the guide column is a rectangular shell structure, and four sets of the guide wheels are provided on the upper and lower sides of the counterweight, and the four sets of guide wheels are respectively connected with the rectangular shell structure. The four corner guides of the cavity move to fit. The rectangular structure cooperates with the guide wheels set at the four corners, so that the counterweight will only rise along the guide column and will not rotate by itself.

Technical solution 10: On the basis of technical solution 9, the traction software is a belt, and the pulley is a drum that can be wound by the belt. The belt has a large bearing capacity and a small amount of deformation, and it is very convenient to cooperate with the roller.

Technical solution 11: On the basis of technical solution 10, the driving device is a geared motor, and the output shaft of the geared motor is connected to the first pulley to drive two sets of traction software to move synchronously.

Technical solution 12: On the basis of technical solution 1 or 2, second rails are provided on the opposite and opposite sides of the two guide columns, and two second rails are also provided on the lifting frame to cooperate with the guide movement of the second rails. The second matching part, the second track is a rectangular bar, and the second matching part includes three rollers respectively rolling and cooperating with the three sides of the rectangular bar.

Description of drawings

Fig. 1 is the front view of the transfer forklift in the embodiment 1 of the vehicle production line of the present invention;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a partial cross-sectional schematic diagram of A place in Fig. 1;

Fig. 4 is a partial enlarged view of place B in Fig. 3;

Fig. 5 is the structural representation of lifting frame;

Fig. 6 is the arrangement drawing of belt;

Fig. 7 is the cooperative structural diagram of counterweight and guide post;

Fig. 8 is a partial structural schematic diagram of the transfer fork lifter in Embodiment 2 of the vehicle production line;

Fig. 9 is a partial structural schematic diagram of another perspective of the transfer forklift in the second embodiment of the vehicle production line;

In Fig. 1-7: 1-guide column, 11-track, 2-lifting frame, 21-U-shaped frame, 3-mobile unit, 31-first roller, 32-second roller, 33-third roller, 4 -Shifting fork, 5-pulley block, 51-first roller, 52-second roller, 61-long belt, 62-short belt, 63-first connecting bolt, 64-second connecting bolt, 7-counterweight , 8-reduction motor, 10-body, 20-climbing ladder, 30-vehicle; 40-guide wheel;

Among Fig. 8-9: 100-reduction motor, 101-sprocket wheel, 102-chain, 103-lifting frame, 104-climbing ladder, 105-counterweight, 106-body, 107-shift cargo fork.

Detailed ways

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

Specific embodiment 1 of the vehicle production line of the present utility model: the vehicle production line in this embodiment includes each station for vehicle processing and assembly, when different processes or different conveying methods of the vehicle production line, especially between two different heights ( When it is necessary to realize the transfer and conversion of the vehicle body 10 between the stations between the floors), a device for realizing this function needs to be provided. The vehicle production line of the present utility model includes being arranged between two stations that need to be transferred As shown in Figures 1 and 2, the transfer forklift between stations of different heights includes two guide columns 1, and may also include auxiliary columns to strengthen the structural strength. Guide column 1 Made of rectangular steel pipes, the guide post 1 is fixed on the foundation or on a steel plate on the ground or on other platforms through bolts or welding. After the guide post 1 is fixed, it is in a vertical state, and the two sides of the vertical two guide post connection directions of each guide post 1 are provided with rails 11 extending up and down, as shown in Figure 4, that is, each guide post 1 is provided with There are two relative tracks 11, this track is the first track, the track 11 extends along the length direction of the guide post 1, that is, the vertical direction, and the track 11 is a rectangle or a square steel bar.

As shown in Figures 1 and 3, there is also a lifting frame 2 between the guide columns 1. The lifting frame 2 is welded by two side-by-side longitudinal beams and multiple cross beams. and other profiles, the lifting frame is the bracket of the car body, and two connecting rods are hinged at both ends of the lifting frame. A matching part is respectively stuck on the rails on both sides of the rectangular guide post through the U-shaped frame. In other embodiments, a second matching part can also be set on the lifting frame, and a second track is correspondingly set on the guide post. The second track can be arranged on the opposite and opposite sides of the two guide posts, and is specifically a rectangular strip, and the second matching part is three rollers rollingly matched with the three sides of the track. Lifting frame is in level all the time when moving up and down along track 11. As shown in Figures 3 and 4, the mobile unit 3 includes a roller and a roller mount, and there are three rollers, which are respectively a first roller 31, a second roller 32 and a third roller 33, and the first roller 31 and the third roller 33 are arranged oppositely. , respectively corresponding to the opposite sides of the rectangular or square steel bar of the track 11, the opposite side refers to the left and right sides of the rectangular bar, the rear side of the rectangular bar and the guide post 1 are integrated or welded, and the front side of the rectangular or square steel bar Rollingly cooperate with the second roller 32, that is, the wheel surfaces of the three rollers respectively cooperate with the three side surfaces of the rectangular or square steel bar, so as to realize guiding sliding in three directions. Wherein the first roller 31 and the third roller 33 are located at the same level, and the second roller 32 is higher than these two rollers. Since two rails 11 are respectively provided on the two guide posts, and two moving units are respectively provided on the U-shaped frame at both ends of the lifting frame to cooperate with it, so that the force applied by the lifting frame to the rails in any direction can be carried , the purpose of such setting is to ensure that the elevator can operate stably even if the transfer body 10 is under the condition of unbalanced load.

As shown in Figure 1-3, the lifting frame 2 is provided with a transfer fork 4 that can be extended and retracted horizontally and the telescopic direction is from any side of the space between the two guide columns 1, and the transfer fork 4 is from the rectangular length The protruding setting of the side can ensure that the vehicle body 10 can be retracted into the space between the guide pillars 1 along with the moving fork 4, and can be lifted up and down in this space, between the highest position and the lowest position of the lifting frame 2, The transfer fork 4 can realize the transfer of the vehicle body 10 from a high position to a low position, or from a low position to a high position, and can realize handover and conversion from one side, or transfer from one side to the other side after passing through the space between the guide pillars 1 . The transfer fork is composed of a transmission gearbox, a lower fork, a middle fork and an upper fork. The lower fork and the transmission gearbox are fixed together, and the upper fork and the middle fork realize two-way operation through rack and pinion transmission. Two sets of transfer forks are used in pairs, and the middle is connected by a universal joint shaft, and one side is driven by a motor to realize synchronous linkage on both sides. Since the transfer fork is installed on the lifting frame of the elevator and moves up and down with the elevator, the transfer fork is transferred to other equipment at the high position and the low position respectively. Reduce the number of handover equipment and running time, and improve production efficiency.

As shown in Figures 1 and 6, a block pulley 5 is also installed on the top of the guide column 1, and the block pulley 5 includes a first roller 51 and a second roller 52, the first roller 51 is longer than the second roller 52, the first roller 51 and the second roller 52 The two rollers 52 are respectively positioned above the two sides of the elevator frame 2, so that the belts hanging down from the first and second rollers are conveniently connected with the elevator frame 2, wherein the right side is the second roller 52, and the left side is the first roller 51. Long belt 61 has two to be lapped on the first cylinder 51 and the second cylinder 52 simultaneously, and its drooping left end connects counterweight 7, the right side of drooping right end connects lifting frame 2; Short belt 62 also comprises two, its One end is connected to the counterweight 7 after bypassing the first drum 51, and the other end is connected to the left side of the lifting frame 2, and one end of the long belt 61 and the short belt 62 are connected to the same counterweight 7, when the counterweight 7 moves up and down When the long belt 61 and the short belt 62 simultaneously drive both sides of the lifting frame 2 to move up and down synchronously, and cooperate with the mobile unit 3 and guide rails to realize the horizontal and gentle lifting of the lifting frame 2 all the time. When the long belt and the short belt are connected to the lifting frame, the first connecting bolt is used for connection. The lower part of the connecting bolt is covered with a spring. There are at least two connecting nuts on the connecting bolt to ensure reliable connection strength and anti-loosening between the nuts. . The long and short belts are connected to the counterweight by a second connecting bolt, and the bottom of the belt is provided with a connecting piece to connect with the counterweight. Once one of them breaks, the connecting beam will move relatively and send a signal to make the elevator stop working. There is an inspection hole at the bottom of the guide post for inspection and easy adjustment of the belt or chain.

As shown in Figures 1 and 3, the first roller 51 is driven by a reduction motor 8, that is, the first roller 51 is a driving roller, the second roller 52 is a driven roller, and the output shaft of the reduction motor 8 is coaxially arranged with the first roller 51 , to drive the first drum 51 to rotate, because the long belt 61 and the short belt 62 are all wound on the first drum 51, so the rotation of the first drum 51 will drive the long and short belts to move simultaneously, and because the counterweight 7 can basically balance the lifting The total weight of the frame 2 and the vehicle body 10, so the driving force output by the reduction motor 8 only needs to overcome the small weight difference and the friction between the roller and the belt, which is very labor-saving. As shown in Figure 1, a climbing ladder is provided on the guide post to facilitate climbing during maintenance.

As shown in Figure 7, the guide column is a rectangular shell structure, and the counterweight is guided and assembled by the guide wheels 40 in the inner rectangular cavity, and the counterweight is respectively connected with the inner cavity wall of the rectangular shell by the four sets of upper and lower guide wheels. The four corners are guided together so that the counterweight can move up and down along with the belt along the guide post. The guide wheel set on each corner includes two guide wheels 40 arranged vertically, which roll and cooperate with the adjacent two wall surfaces of the inner cavity wall of the guide post respectively, and the counterweight will not rotate when moving up and down in the guide post, ensuring that the belt will not Crooked.

When the vehicle production line of the utility model is in use: arrange the transfer forklift between two stations that need to realize the transfer and conversion of the vehicle body 10, and give priority to the transfer and conversion between different heights (floors). The fork 4 is in the middle position between the guide columns 1, that is, it shrinks to be located on the lifting frame 2, and the lifting frame 2 and the related connecting frame connected to it are at the lowest position. After being put in place and accurately positioned, the elevator runs from the low position to the high position, and the transfer fork 4 on the lifting frame 2 stretches out from the middle position to the lower part of the vehicle body 10, and stops after being in place, and then the lifting frame 2 rises again to lift the vehicle body 10 from the loaded Jack up on the tool 30 to realize the separation of the vehicle body 10 and the carrier 30; then the transfer fork 4 carries the vehicle body 10 back to the middle position, the lifting frame 2 drops to the low position, and the conveying equipment simultaneously lifts the carrier 30 during the lowering process of the lifting frame 2 30 is transported away from the handover position. At this time, after the carrier 30 of the body 10 waiting for handover on the other side is transported in place and positioned, the fork carries the body 10 and stretches out to the set position where the body 10 is located on the carrier 30 . Together with the transfer fork 4, the vehicle body 10 is lowered onto the waiting carrier 30; then the transfer fork 4 is retracted, and the conveyor transports the vehicle body 10 away. Thereby, a work cycle of handover of the vehicle body 10 is completed, and the next cycle is awaited.

Embodiment 2: As shown in Figures 8 and 9, the difference between this embodiment and Embodiment 1 is that the first and second rollers are replaced by sprockets 101, and the long and short belts are replaced by adapted long and short chains 102, relative to the belt, the transmission of the chain 102 and the sprocket 101 can be used in high temperature occasions.

In other embodiments: the guide post can also use two pairs or three pairs of guide posts; the guide post can also use other profiles, such as I-beam, channel steel, etc., and can also be welded into a rectangle with angle steel or welded with steel plates. Round steel pipes can also be used; other columns parallel to the guide columns can also be installed, such as columns without guide rails but which can strengthen the structural strength between the guide columns, or columns for installing other components, etc. There is no need to set up columns on the columns Guide rails, just set the guide rails on the guide columns; the rollers can also be replaced by ordinary pulleys, and the belts can be replaced by wire ropes at this time; the transfer fork lift can also be used for the transfer and conversion of multiple conveying equipment with two different carriers, such as Skid and skid conveying, skid and spreader conveying, skid and trolley friction conveying, skid and skateboard conveying, etc.; the transfer fork can also protrude from only one side; the number of rollers It can also be replaced by six, with two arranged side by side; the number of pulleys can also be replaced by three or four; the geared motor can also be replaced by a linear motor or a hydraulic cylinder, a pneumatic cylinder, etc.

The embodiments of the load-shifting fork lifter of the present utility model are the same as those of the load-shifting fork lifter in the various embodiments of the vehicle production line of the present utility model, and will not be repeated here.

Claims (24)

1. A kind of transfer goods fork lifter, it is characterized in that, comprises at least one pair of guide pillars, and each pair of guide pillars comprises two guide pillars arranged left and right, each guide pillar is respectively provided with two The first rail extending up and down is provided with a lifting frame between the guide columns, and the lifting frame is provided with four first matching parts respectively cooperating with the guiding movement of the first rail. For the cargo-carrying fork, there is also a pulley block on the top of the lifting fork lifter, and a traction software is wound on the pulley block. One end of the traction software is connected to the lifting frame, and the other end is connected to the counterweight in the guide column to transfer the cargo. The fork lifter also includes a driving device that drives the traction software to move the lift frame up and down. 2. The loading forklift according to claim 1, characterized in that U-shaped frames are respectively provided on both sides of the lifting frame close to the guide column, and the upper and lower two groups of the first brackets are respectively provided on the two sides of the U-shape. Cooperate with the Ministry. 3. The transfer forklift according to claim 1 or 2, wherein the first track is a rectangular bar, and the first fitting part is respectively movable and matched with three sides of the rectangular bar. 4. The forklift for transferring goods according to claim 3, wherein the rectangular bar is a square steel bar, and the first mating part rolls and cooperates with three sides of the square steel bar through three rollers. 5. The transfer fork lift according to claim 4, characterized in that, the telescoping direction of the fork is perpendicular to the direction of the line between the two guide posts, and there is a moving fork between the two guide posts. The carrying space holds the cargo when it is retracted. 6. The transfer forklift according to claim 5, characterized in that, the two sides of the accommodation space are respectively provided with transfer positions for transferring goods, and the transfer fork can be stretched between the two transfer positions and the accommodation space . 7. The transfer fork lift according to any one of claims 4-6, wherein the pulley block comprises two pulleys, the two pulleys are respectively arranged on opposite sides of the lifting frame, and the traction software has Two groups, each group has two, one group of traction software bypasses the first pulley and connects to one side of the lifting frame, the other group bypasses the two pulleys and connects to the other side of the lifting frame, two sets of traction software The other end is connected to the counterweight. 8. The transfer forklift according to claim 1 or 2, wherein the guide column is a shell structure, and the inside of the shell guides and assembles the counterweight through guide wheels. 9. The loading fork lift according to claim 8, wherein the guide column is a rectangular shell structure, and the counterweight is provided with four sets of guide wheels above and below each, and four sets of guide wheels respectively cooperate with the four corner guides of the inner cavity of the rectangular housing structure to move. 10. The load transfer forklift according to claim 9, wherein the traction software is a belt, and the pulley is a roller on which the belt can be wound. 11. The load transfer forklift according to claim 7, wherein the driving device is a geared motor, and the output shaft of the geared motor is connected to the first pulley to drive two sets of traction software to act synchronously. 12. The transfer forklift according to claim 1 or 2, characterized in that a second rail is provided on the opposite and opposite sides of the two guide columns, and two rails are provided on the lifting frame that are respectively connected to the second rail. The second matching part guides the movement of the two rails, the second track is a rectangular strip, and the second matching part includes three rollers that roll and cooperate with the three sides of the rectangular strip respectively. 13. Vehicle production line, including two high and low stations and a transfer fork lifter set between the two stations for realizing the handover and conversion of the body between the two stations, characterized in that the transfer fork The lift includes at least one pair of guide pillars, each pair of guide pillars includes two guide pillars arranged left and right, two first rails extending up and down are respectively arranged on the sides of the front and rear sides of each guide pillar, and there are two first rails extending up and down between the guide pillars. Lifting frame, the lifting frame is provided with four first matching parts that are respectively coordinated with the first rail guide movement, and the lifting frame is also provided with a transfer fork that can be extended and retracted horizontally for transferring goods, and the transfer fork lifter There is also a pulley block on the top of the pulley block, and traction software is wound on the pulley block. One end of the traction software is connected to the lifting frame, and the other end is connected to the counterweight in the guide column. drive unit. 14. The vehicle production line according to claim 13, characterized in that U-shaped frames are respectively provided on both sides of the lifting frame close to the guide pillars, and two sets of upper and lower first fitting parts are respectively provided on the two sides of the U-shape. 15. The vehicle production line according to claim 13 or 14, wherein the first track is a rectangular strip, and the first matching portion is respectively movable and engaged with three sides of the rectangular strip. 16 . The vehicle production line according to claim 15 , wherein the rectangular bar is a square steel bar, and the first mating part rolls and cooperates with three sides of the square steel bar through three rollers. 17. The vehicle production line according to claim 16, characterized in that, the expansion and contraction direction of the fork is perpendicular to the direction of the line between the two guide columns, and there is a telescoping direction between the two guide columns in which the goods are carried by the transfer fork. Storage space for cargo when returning. 18. The vehicle production line according to claim 17, wherein the two sides of the accommodation space are respectively provided with handover positions for handing over goods, and the transfer fork can be stretched between the two handover positions and the accommodation space. 19. The vehicle production line according to any one of claims 16-18, wherein the pulley block includes two pulleys, and the two pulleys are respectively arranged on opposite sides of the lift frame, and the traction software has two groups, There are two in each group, one group of traction software bypasses the first pulley and connects to one side of the lifting frame, the other group bypasses the two pulleys and connects to the other side of the lifting frame, and the other end of the two sets of traction software Attach the counterweight. 20. The vehicle production line according to claim 13 or 14, wherein the guide column is a shell structure, and the inside of the shell is guided by guide wheels to assemble the counterweight. 21. The vehicle production line according to claim 20, characterized in that, the guide column is a rectangular shell structure, and four sets of guide wheels are respectively arranged on the upper and lower sides of the counterweight, and the four sets of guide wheels are respectively connected to the rectangular shell structure. The four corner guides of the inner cavity of the shell structure are moved and matched. 22. The vehicle production line according to claim 21, wherein the traction software is a belt, and the pulley is a roller on which the belt can be wound. 23. The vehicle production line according to claim 19, wherein the driving device is a geared motor, and the output shaft of the geared motor is connected to the first pulley to drive two sets of traction software to act synchronously. 24. The vehicle production line according to claim 13 or 14, wherein a second rail is provided on the opposite and opposite sides of the two guide columns, and two guide rails are respectively provided on the lifting frame to guide the second rail. The second matching part for mobile matching, the second track is a rectangular bar, and the second matching part includes three rollers respectively rolling and cooperating with the three sides of the rectangular bar.