CN109941915B

CN109941915B - Self-balancing material vehicle

Info

Publication number: CN109941915B
Application number: CN201910343117.2A
Authority: CN
Inventors: 高尚
Original assignee: Individual
Current assignee: Yangzhou Jingxincheng Intelligent Technology Co ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-12-18
Anticipated expiration: 2039-04-26
Also published as: CN109941915A

Abstract

The invention relates to a self-balancing material vehicle, wherein two sides of the rear end of a base are respectively connected with an upright post, the tops of the two upright posts are connected with each other through a top plate, a lifting floating frame is arranged between the two upright posts, the floating frame comprises a floating vertical plate positioned on the inner side of the upright post and a floating bottom plate connected to the lower ends of the two floating vertical plates, and the front side and the rear side of the top of each floating vertical plate are respectively connected with each other through a floating top frame plate; the lower part of the floating frame is symmetrically connected with vertical short plates extending forwards, the front ends of the vertical short plates at two sides are connected with each other through a cross rod, and a horizontal tray extending forwards is mounted on the cross rod; the floating frame is provided with a counterweight device. The fixed balance weight is equal to the no-load weight of the floating part, the floating bottom plate is connected with a plurality of balance weight springs, the upper ends of the balance weight springs are respectively fixed with spring buckles, and the spring buckles are respectively matched and sleeved with C-shaped hooks. The elastic coefficients of the counterweight springs are the same or different. This material car can make the material box be in suitable height, conveniently gets to put, improves work efficiency.

Description

Self-balancing material vehicle

Technical Field

The invention relates to logistics equipment, in particular to a self-balancing material vehicle, and belongs to the technical field of material transport vehicles.

Background

Automatic production lines or other work places often adopt the material car to transport the material box to each station, and the material box is placed on the bracket of material car, and after the material car arrived the purpose station, the operative employee took off the material from the material box. The defects in the using process are as follows: the actual height of the magazine is usually lower or higher than the height at which the operator is able to pick the parts, which is not ergonomic.

When the position of thing magazine is too high, the operative employee need lift up the arm and stand on tiptoe even and get the piece, not only harder, takes place to fall the piece moreover easily, has certain danger. When the position of material box was on the high side, directly get the piece from the material box one by one, also can let the operative employee very uncomfortable, very fast the arm will be tired soon. When the position of the material box is too low, an operator needs to bend down to take a part, the same labor is wasted, and the waist of the operator is easily uncomfortable.

More conditions are that, the stack has the multilayer material box on the bracket of material car, if the rigidity of bracket is motionless, then need accomplish eminence in proper order when the operative employee gets the piece and get the piece, the middle part is got the piece and the lower department is got the piece, frequent arm of lifting and the work of bowing cause operative employee's arm fatigue and psoatic strain easily, are unfavorable for labor protection, influence production efficiency. Especially, if an operator needs to take or put parts from the material box thousands of times every day, whether the material box is at the height which accords with ergonomics or not has great influence on the physical health or the working efficiency of the operator.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide a self-balancing material vehicle, which adopts a floating tray to always enable a material box to be at a workpiece taking height according with ergonomics, is beneficial to improving the operating environment, protects the body health of an operator and improves the working efficiency.

In order to solve the technical problems, the self-balancing material vehicle comprises a base, wherein wheels are arranged below the base, two sides of the rear end of the base are respectively connected with upright posts which are erected upwards, the tops of the two upright posts are connected with each other through a top plate, a lifting floating frame is arranged between the two upright posts, the floating frame comprises floating vertical plates positioned on the inner sides of the upright posts and floating bottom plates connected to the lower ends of the two floating vertical plates, and the front side and the rear side of the tops of the two floating vertical plates are respectively connected with each other through floating top frame plates; the lower part of the floating frame is symmetrically connected with vertical short plates extending forwards, the front ends of the vertical short plates at two sides are connected with each other through a cross rod, and a horizontal tray extending forwards is mounted on the cross rod; the floating frame is provided with a counterweight device.

Compared with the prior art, the invention has the following beneficial effects: after the material box is placed on the horizontal tray, the horizontal tray is maintained at a proper height by the counterweight device, so that the material box is at a workpiece taking height which accords with ergonomics, then the material trolley is pushed to a target station, and an operator can avoid lifting arms or bending waist when taking materials from the material box; similarly, if an operator places materials into the empty material box, the empty material box is comfortable and not easy to fatigue, thereby being beneficial to protecting the health of the operator and improving the working efficiency.

As an improvement of the invention, the outer sides of the two floating vertical plates are respectively fixed on the sliding blocks, the two sliding blocks are respectively supported on the vertical guide rails, and the two vertical guide rails are respectively fixed on the corresponding upright posts. When the slider slides up and down along the vertical guide rail, the floating frame can be driven to integrally lift, the horizontal tray carries the material box to synchronously lift along with the floating frame, and the material box can be guaranteed to lift very stably along the axis of the vertical guide rail.

As a further improvement of the invention, the outer sides of the two floating vertical plates are respectively fixed with a guide roller and a centering roller, the axis of the guide roller extends along the front-back direction, the axis of the centering roller extends along the left-right direction, the guide roller and the centering roller are respectively supported in corresponding U-shaped grooves, and the U-shaped grooves are fixed on corresponding upright posts. Because the horizontal tray is of a cantilever structure, a larger unbalance loading moment can be formed after the material box is placed on the horizontal tray; when the horizontal tray carries the material box to go up and down, the both sides of floating frame are passed through guide roller and are right the gyro wheel and go up and down along the U-shaped groove, can guarantee on the one hand that the lift is very steady, and on the other hand is right the gyro wheel and is supported both sides around the U-shaped groove, can bear great unbalance loading moment, guarantees that material box is in the horizontality.

As a further improvement of the invention, the counterweight device comprises a counterweight rod, a steel wire rope and a fixed pulley, the fixed pulley is fixed below the top plate, the middle section of the steel wire rope is wrapped on the fixed pulley, one end of the steel wire rope is connected with the floating frame, the other end of the steel wire rope is connected with the counterweight rod, and a plurality of counterweights are fixed on the counterweight rod. The floating frame is suspended at one end of the steel wire rope, the balance weight rod is suspended at the other end of the steel wire rope, the steel wire rope can freely slide around the fixed pulley, and the number and the weight of the balance weight blocks are adjusted, so that when the weights at the two ends of the steel wire rope are equal, the horizontal tray can be in a balanced state at any position.

As a further improvement of the invention, the upright column is a wire, a plate or a section, a plurality of grooves extending vertically are formed in the surface of the upright column, the left end and the right end of the counterweight rod are symmetrically screwed with the guide heads, and the outer ends of the guide heads at the two sides are symmetrically embedded in the grooves of the upright column. The upright post can adopt a wire or a plate, and a guide groove is processed or installed on the wire or the plate; the section bar can be directly used, for example, the section bar which is very easy to purchase and low in price is adopted, so that the manufacturing cost of the material trolley is reduced, and the manufacturing period is shortened; the guide heads at the left end and the right end of the counterweight rod are embedded in the groove of the upright column to slide up and down, so that the counterweight rod can stably lift along a vertical plane, and can not deviate or rock. The vertical guide rail and the like can be conveniently fixed by the T-shaped screws in the groove of the upright column, so that the upright column is very convenient and fast and has accurate axis.

As a further improvement of the invention, the total weight of the balance weight rod and each balance weight block is equal to the no-load weight of the floating part, and a plurality of V-shaped caulking grooves are correspondingly arranged on the upper edges of the two floating top frame plates; the floating bottom plate is connected with a plurality of balance weight springs, the upper ends of the balance weight springs are respectively fixed with a spring fastener, the lower part of each spring fastener is positioned between the two floating top frame plates, the upper part of each spring fastener is respectively placed in the V-shaped caulking groove of the floating top frame plate, and the middle part of the upper end of each spring fastener is respectively provided with a hook hole; each spring buckle is respectively matched with a C-shaped hook which can be screwed into the hook hanging hole, the upper end of each C-shaped hook is fixed on a C-shaped hook pin shaft, each C-shaped hook pin shaft is respectively fixed on a C-shaped hook fixing frame, and the C-shaped hook fixing frame is fixed below the top plate; the driving end of each C-shaped hook pin shaft is provided with a straight groove, a cross groove, a hexagonal head, a square tenon or a tool-free quick-rotation device.

The floating part comprises a floating frame and objects connected to the floating frame, and the total weight of the counterweight rod and the counterweight blocks is equal to the no-load weight of the floating part, so that the two ends of the steel wire rope are in a weight balance state before the material box is placed; the initial working position can be fixed and unchanged without manual intervention. According to the weight and the height of a material box to be borne on the horizontal tray, before the material box is placed, a corresponding counter weight spring is selected to be thrown in, the hook head of the C-shaped hook is turned into the hook hole of the corresponding spring fastener by rotating the C-shaped hook pin shaft, and the counter weight spring enters a throwing state; because the no-load weight is balanced by the balance weight rod and each balance weight block, the stress of the balance weight spring which is just put into use is zero, namely the balance weight spring is not stretched. When the balance weight spring is thrown, the spring does not need to be pulled upwards with great effort, and only the C-shaped hook pin shaft needs to be rotated; the C-shaped hook is positioned below the top plate and is convenient to adjust.

After the material box is placed on the horizontal tray, the horizontal tray descends, and the lower ends of the counterweight springs descend along with the floating bottom plate; the unused counterweight spring is still placed in the V-shaped caulking groove of the floating top frame plate due to the spring fastener at the upper part and synchronously ascends and descends along with the floating frame; the spring is elongated because the spring catch at the upper end is hooked by the C-shaped hook. If the weight of one material box is F (N), the elastic coefficient of the throwing spring is k (N/m), the elongation x = F/k (m) of the throwing spring is reached, and the height of the horizontal tray is reduced by 1x (m) when one material box is placed on the horizontal tray. If two material boxes are placed on the horizontal tray, the height of the horizontal tray is reduced by 2x (m); if three material cassettes are placed on the horizontal tray, the height of the horizontal tray is lowered by 3x (m).

According to the weight F (N) and the height h (m) of the material box after the material box is loaded, the total elastic coefficient k (N/m) of the loaded springs can be changed by selecting and loading different specifications of the weighted springs or changing the number of the loaded springs, so that h =1x (m), namely 1x is exactly equal to or close to the height h of the material box. After a material box is placed on the horizontal tray, the distance from the top of the material box to the ground is A (m), after a second material box is superposed above the first material box, the horizontal tray continues to descend by 1x (m) under the elastic action of a counterweight spring, and the distance from the top of the second material box to the ground is A (m); and after a third material box is continuously superposed above the second material box, the horizontal tray continuously descends by 1x (m) under the elastic action of the counterweight spring, and the distance from the top of the third material box to the ground is A (m) and so on.

Similarly, if the third material box is taken down, the horizontal tray is lifted by 1x (m), and the distance from the top of the second material box to the ground is still maintained to be A (m); and the second material box is continuously taken down, the horizontal tray continuously rises by 1x (m), the distance from the top of the first material box to the ground is still maintained as A (m), so that no matter a plurality of layers of material boxes are placed on the horizontal tray, the topmost material box is always maintained at a height which accords with ergonomics, an operator can be very conveniently maintained at the best position to operate, meanwhile, each material box is manually carried without the need of operation, the labor intensity is reduced, and the carrying waste is reduced.

As a further improvement of the invention, the upper end of each C-shaped hook is respectively provided with a semi-circular arc head coaxial with the C-shaped hook pin shaft, each semi-circular arc head is pressed with a rotation stopping spring leaf, and the root of each rotation stopping spring leaf is fixedly connected below the top plate. Before the C-shaped hook is not hooked with the hook hole of the spring fastener, the C-shaped hook is kept in a horizontal state, and at the moment, the rotation stopping reed is pressed on a plane outside the semicircular arc head of the C-shaped hook pin shaft to prevent the C-shaped hook pin shaft from rotating; when the C-shaped hook is required to be thrown, the straight groove of the C-shaped hook pin shaft is rotated by a screwdriver or a hand wheel is rotated without tools, so that the C-shaped hook is rotated by 90 degrees, and the hook head is screwed into the hook hanging hole of the spring fastener.

As a further improvement of the invention, the elastic coefficients of the counterweight springs are the same or different. When the elastic coefficients of the counter weight springs are the same and the extension lengths are the same, the weight that can be borne by one counter weight spring is 1f, the weight that can be borne by two counter weight springs is 2f, the weight that can be borne by three counter weight springs is 3f, and so on.

When the elastic coefficients of the counterweight springs are partially the same or different, under the condition of the same extension length, the weight born by the counterweight springs can be 0.1 f-10 f or even more, and the adjustment precision is improved; the weight of the material box can be accurately matched according to the design of the customer requirement.

The required elastic coefficient can be calculated in advance according to the weight and the height of the material box, a comparison table corresponding to springs with different weights is manufactured, and when the material box is used, only the comparison table needs to be checked, and a screwdriver or a tool-free tool is used for rotating the corresponding connecting hook.

As a further improvement of the invention, the rear end faces of the two upright posts are covered with rear sealing plates, the front end faces of the two upright posts are covered with front sealing plates, the front sealing plates are symmetrically provided with front sealing plate long grooves extending along the vertical direction, the two vertical short plates respectively penetrate through the corresponding front sealing plate long grooves, and the upper parts of the front sealing plates are provided with avoidance holes corresponding to the ends of the C-shaped hook pin shafts. The front sealing plate and the rear sealing plate can cover the floating frame, the balance weight spring, the spring fastener, the sliding block, the guide rail, the balance weight rod, the balance weight block, the steel wire rope, the fixed pulley and the like, so that the appearance is neat and attractive, and the labor protection and the cleaning of sliding block lubricating oil are facilitated. The long groove of the front sealing plate can be used for the vertical short plate to slide up and down so as to match with the lifting of the horizontal tray. The avoiding hole at the upper part of the front sealing plate can be used for a screwdriver to be inserted into the straight groove of the C-shaped hook pin shaft so as to rotate the C-shaped hook.

As a further improvement of the invention, the top and the bottom of the two floating vertical plates are respectively provided with a shock absorption block, the front part of the base is provided with a front handle standing upwards, and the upper part of the rear side of the upright post is provided with a rear handle; a male buckle extending forwards is arranged in the middle of the front end of the base, and an elastic female buckle into which the male buckle can be inserted is arranged in the middle of the rear end of the base; knob screws are respectively screwed at two ends of the cross rod, and rubber heads are arranged at the rear ends of the knob screws. The snubber block can avoid floating the frame and rise to the highest position, cause big striking to the roof, or cause big striking to the base when whereabouts. The front handle and the rear handle are convenient for an operator to hold and push the material vehicle to advance to a target station. The male buckle of the next material vehicle is inserted into the elastic female buckle of the previous material vehicle, so that the plurality of material vehicles are connected end to end, and the plurality of material vehicles can be pushed at one time. The male buckle is a bolt with a downward end, the elastic female buckle comprises a linear plate hinged to the middle of the rear end of the base, a bolt hole is formed in the rear end of the linear plate, and a support spring is arranged below the front part of the linear plate; when the two vehicles are connected, the rear end head of the straight plate is pressed down, the pin of the male buckle of the rear vehicle is inserted into the pin hole of the straight plate, the straight plate is loosened, the straight plate is bounced upwards by the support spring, and the pin hole of the straight plate is sleeved to the root of the pin of the male buckle. After the material car finishes loading of the material box at the loading station, the knob screw is rotated, so that the rear end rubber of the knob screw is tightly propped against the upright column, the positions of the floating frame and the horizontal tray are locked, and the phenomenon that the material box above the material car jumps up and down to cause the material box to fall off due to bumping of the horizontal tray in the advancing process of the material car is avoided.

Drawings

The invention will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

Fig. 1 is a front view of a self-balancing material vehicle according to a first embodiment of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a left side view of fig. 1.

Fig. 4 is a first perspective view of the self-balancing material vehicle of the present invention.

Fig. 5 is a schematic view of fig. 4 with the front closure plate removed.

Fig. 6 is a second perspective view of the self-balancing material vehicle of the present invention.

Fig. 7 is a schematic view of fig. 6 with the closure plate removed.

Fig. 8 is a third perspective view of the present invention with the top plate and the C-shaped hook holder removed.

FIG. 9 is a perspective view of a second embodiment of the present invention with the top plate and one side post removed.

Fig. 10 is a perspective view of fig. 9 with the U-shaped slot removed.

In the figure: 1. a base; 1a, a wheel; 2. a column; 2a, forming a groove; 2 b.U-shaped grooves; 3. a top plate; 4. a vertical guide rail; 5. a slider; 6. a floating frame; 6a, a floating vertical plate; 6b, floating bottom plate; 6c, floating the top frame plate; 6c1. V-shaped caulking groove; 6d, damping blocks; 6e, guiding rollers; 6f, righting the roller; 7. a vertical short plate; 8. a cross bar; knob screw; 9. a horizontal tray; 10. a weight lever; 10a, a guide head; 10b, a balancing weight; 11. a wire rope; 12. a fixed pulley; 13. a counterweight spring; 14. a spring buckle; 14a, hooking holes; a C-shaped hook; 15a, a semicircular arc head; a C-shaped hook pin shaft; 16a, a straight slot; a C-shaped hook mount; 18. a rotation stopping reed; 19. a front closing plate; 19a, a long groove of the front sealing plate; 19b, avoiding holes; 20. a rear closing plate; 21. a front handle; 22. a rear handle; 23. a male buckle; 24. elastic female button.

Detailed Description

In the following description of the present invention, the terms "front", "rear", "left", "right", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not mean that the apparatus must have a specific orientation.

As shown in fig. 1 to 9, the self-balancing material vehicle of the present invention includes a base 1, wheels 1a are disposed below the base 1, two sides of the rear end of the base 1 are respectively connected with upright posts 2 standing upwards, the lower ends of the two upright posts 2 can be connected to a bottom plate, and the bottom plate is fixed on the base 1. The tops of the two upright posts 2 are connected with each other through a top plate 3, a floating frame 6 capable of lifting is arranged between the two upright posts 2, the floating frame 6 comprises floating vertical plates 6a positioned on the inner sides of the upright posts 2 and floating bottom plates 6b connected to the lower ends of the two floating vertical plates 6a, and the front side and the rear side of the tops of the two floating vertical plates 6a are connected with each other through floating top frame plates 6c respectively; the lower part of the floating frame 6 is symmetrically connected with vertical short plates 7 extending forwards, the front ends of the vertical short plates 7 at two sides are connected with each other through a cross rod 8, and a horizontal tray 9 extending forwards is installed on the cross rod 8; the floating frame 6 is provided with a counterweight device.

After the material box is placed on the horizontal tray 9, the horizontal tray 9 is maintained at a proper height by the counterweight device, so that the material box is at a workpiece taking height which accords with ergonomics, then the material trolley is pushed to a target station, and when an operator takes materials from the material box, the operator can avoid lifting arms or bending waist; similarly, if an operator places materials into the empty material box, the empty material box is comfortable and not easy to fatigue, thereby being beneficial to protecting the health of the operator and improving the working efficiency.

Fig. 1 to 8 show a first embodiment of the present invention, outer sides of two floating risers 6a may be respectively fixed on sliders 5, the two sliders 5 are respectively supported on vertical guide rails 4, and the two vertical guide rails 4 are respectively fixed on corresponding columns 2. When the slider 5 slides up and down along the vertical guide rail 4, the floating frame 6 can be driven to integrally lift, the horizontal tray 9 carries the material box to synchronously lift along with the floating frame 6, and the material box can be guaranteed to lift very stably along the axis of the vertical guide rail 4.

The counterweight device comprises a counterweight rod 10, a steel wire rope 11 and a fixed pulley 12, the fixed pulley 12 is fixed below the top plate 3, the middle section of the steel wire rope 11 is wound on the fixed pulley 12, one end of the steel wire rope 11 is connected with the floating frame 6, the other end of the steel wire rope 11 is connected with the counterweight rod 10, and a plurality of counterweight blocks 10b are fixed on the counterweight rod 10. One end of the steel wire rope 11 suspends the floating frame 6 in a suspending mode, the other end of the steel wire rope suspends the balance weight rod 10 in a suspending mode, the steel wire rope 11 can freely slide around the fixed pulley 12, and the number and the weight of the balance weight blocks 10b are adjusted, so that when the weights of the two ends of the steel wire rope 11 are equal, the horizontal tray 9 can be in a balance state at any position.

The upright post 2 can be made of a wire or a plate, and a guide groove is processed or installed on the wire or the plate; it is also possible to use the profiles directly, for example using very readily available and inexpensive profiles. The surface of the section bar is provided with a plurality of vertically extending type grooves 2a, the left end and the right end of the counterweight rod 10 are symmetrically and rotatably connected with guide heads 10a, and the outer end heads of the guide heads 10a at the two sides are symmetrically embedded in the type grooves 2a of the section bar. Most of the section bars are aluminum section bars, so that the section bars are very easy to purchase and low in price, the manufacturing cost of the material trolley is reduced, and the manufacturing period is shortened; the guide heads 10a at the left end and the right end of the weight rod 10 are embedded in the groove 2a of the sectional material to slide up and down, so that the weight rod 10 can stably lift along a vertical plane, and the deviation and the shaking cannot occur. The section bar groove 2a is convenient for fixing the vertical guide rail 4 and the like by adopting T-shaped screws, and is very convenient and fast, and the axis is accurate.

The total weight of the weight lever 10 and each weight 10b is equal to the unloaded weight of the floating member, which includes the floating frame 6 and each object connected to the floating frame 6. A plurality of V-shaped caulking grooves 6C1 are correspondingly arranged on the upper edges of the two floating top frame plates 6C; a plurality of balance weight springs 13 are connected to the floating bottom plate 6b, spring buckles 14 are respectively fixed at the upper ends of the balance weight springs 13, the lower parts of the spring buckles 14 are positioned between the two floating top frame plates 6C, the upper parts of the spring buckles 14 are respectively placed in the V-shaped embedding grooves 6C1 of the floating top frame plates 6C, and the middle parts of the upper ends of the spring buckles 14 are respectively provided with a hook hole 14 a; each spring buckle 14 is respectively matched with a C-shaped hook 15 which can be screwed into the hook hanging hole 14a, the upper end of each C-shaped hook 15 is fixed on a C-shaped hook pin shaft 16, each C-shaped hook pin shaft 16 is respectively fixed on a C-shaped hook fixing frame 17, and the C-shaped hook fixing frame 17 is fixed below the top plate 3; the driving end of each C-shaped hook pin 16 is provided with a straight groove 16a, a cross groove, a hexagonal head or a square tenon.

The no-load weight of the objects connected to the floating frame 6 comprises the weight of the floating frame 6, the sliding block 5 or the guide roller 6e, the righting roller 6f, the vertical short plate 7, the cross bar 8 and the horizontal tray 9, and the total weight of the counterweight rod 10 and each counterweight block 10b is equal to the no-load weight, so that the two ends of the steel wire rope 11 are in a weight balance state before the object box is placed; the initial working position can be fixed and unchanged without manual intervention. According to the weight and height of a material box to be borne on the horizontal tray 9, before the material box is placed, a corresponding counter weight spring is selected to be thrown in, the hook head of the C-shaped hook 15 is rotated into the hook hanging hole 14a of the corresponding spring fastener 14 by rotating the C-shaped hook pin shaft 16, and the counter weight spring enters a throwing state; since the unloaded weight is balanced by the weight lever 10 and each weight 10b, the force applied to the weight spring just used is zero, i.e., it is not yet elongated. When the balance weight spring 13 is thrown, the spring does not need to be pulled upwards with great effort, and only the C-shaped hook pin shaft 16 needs to be rotated; the C-shaped hook 15 is positioned below the top plate 3, and is convenient to adjust.

After the material box is placed on the horizontal tray 9, the horizontal tray 9 descends, and the lower ends of the counterweight springs 13 descend along with the floating bottom plate 6 b; the unused counterweight spring is still placed in the V-shaped caulking groove 6C1 of the floating top frame plate 6C due to the spring fastener 14 at the upper part, and is lifted synchronously with the floating frame 6; the spring that has been used is elongated because the upper snap 14 is hooked by the C-shaped hook 15. If the weight of a material box is F (N), the elastic coefficient of the throwing spring is k (N/m), the elongation x = F/k (m) of the throwing spring, namely, if a material box is placed on the horizontal tray 9, the height of the horizontal tray 9 is reduced by 1x (m). If two material boxes are placed on the horizontal tray 9, the height of the horizontal tray 9 is lowered by 2x (m); if three material cassettes are placed on the horizontal tray 9, the height of the horizontal tray 9 is lowered by 3x (m).

According to the weight F (N) and the height h (m) of the material box after the material box is loaded, the total elastic coefficient k (N/m) of the loaded springs can be changed by selecting and loading different specifications of the weighted springs or changing the number of the loaded springs, so that h =1x (m), namely 1x is exactly equal to or close to the height h of the material box. After a material box is placed on the horizontal tray 9, the distance from the top of the material box to the ground is A (m), after a second material box is superposed above the first material box, the horizontal tray 9 continues to descend by 1x (m) under the elastic action of a counterweight spring, and the distance from the top of the second material box to the ground is A (m); after the third material box is continuously stacked above the second material box, the horizontal tray 9 continuously descends by 1x (m) under the elastic action of the counterweight spring, and the distance from the top of the third material box to the ground is A (m) and so on.

Similarly, if the third material box is taken down, the horizontal tray 9 rises by 1x (m), and the distance from the top of the second material box to the ground is still maintained as A (m); continue to take off second material box, then horizontal tray 9 continues to rise 1x (m), the distance of the top of first material box apart from ground still keeps being A (m), so realized no matter place several layers of material box on horizontal tray 9, the material box of top keeps at the height that accords with ergonomics all the time, the operative employee of being convenient for very keeps operating in the best position, simultaneously need not to be in order to facilitate the operation, each material box of manual handling, reduce intensity of labour, it is extravagant to reduce the transport.

The upper end of each C-shaped hook 15 is respectively provided with a semi-circular arc head 15a coaxial with the C-shaped hook pin shaft 16, each semi-circular arc head 15a is pressed with a rotation stopping reed 18, and the root of each rotation stopping reed 18 is fixedly connected below the top plate 3. Before the C-shaped hook 15 is not hooked with the hook hanging hole 14a of the spring buckle 14, the C-shaped hook should be kept in a horizontal state, and at the moment, the rotation stop reed 18 is pressed on a plane except the semicircular arc head 15a of the C-shaped hook pin shaft 16 to prevent the C-shaped hook pin shaft 16 from rotating; when the C-shaped hook 15 needs to be thrown, the screwdriver rotates the straight groove 16a of the C-shaped hook pin shaft 16 to enable the C-shaped hook 15 to rotate 90 degrees, and the hook head is screwed into the hook hanging hole 14a of the spring buckle 14.

The elastic coefficients of the respective balance springs 13 are the same or different. When the elastic coefficients of the counter weight springs 13 are the same and the extension lengths are the same, if the weight that can be borne by one counter weight spring is 1f, the weight that can be borne by two counter weight springs is 2f, and the weight that can be borne by three counter weight springs is 3f, and so on.

When the elastic coefficients of the counterweight springs 13 are partially the same or different, the weight born by the counterweight springs can be 0.1-10 f or even more under the condition of the same extension length, so that the adjustment precision is improved; the weight of the material box can be accurately matched according to the design of the customer requirement.

The required elastic coefficient can be calculated in advance according to the weight and the height of the material box, spring application reference tables corresponding to different weights are manufactured, when the spring application reference tables are used, only the reference tables need to be checked, a screwdriver or a tool-free tool is used for rotating the corresponding connecting hooks, and seven springs are taken as an example, and the table is shown in the following table.

If the required elastic coefficient is 0-3N/100 mm, the 4 th spring is used. If the required elastic coefficient is 18-21N/100 mm, the 3 rd, 4 th and 5 th springs are used simultaneously. If the required elastic coefficient is 116-119N/100 mm, 1 st, 2 nd, 3 th, 4 th, 6 th and 7 th springs are simultaneously used. If the required elastic coefficient is 122-125N/100 mm, all seven springs are used simultaneously.

The rear end faces of the two upright posts 2 are covered with rear seal plates 20, the front end faces of the two upright posts 2 are covered with front seal plates 19, and the front seal plates 19 and the rear seal plates 20 can cover the floating frame 6, the balance weight springs 13, the spring buckles 14, the sliding blocks 5, the guide rails, the balance weight rods 10, the balance weight blocks 10b, the steel wire ropes 11, the fixed pulleys 12 and the like, so that the appearance is neat and attractive, and the labor protection and the cleaning of lubricating oil of the sliding blocks 5 are facilitated.

As shown in fig. 4, front closing plate 19 is symmetrically provided with front closing plate long grooves 19a extending vertically, two vertical short plates 7 respectively penetrate through the corresponding front closing plate long grooves 19a, and the front closing plate long grooves 19a can allow the vertical short plates 7 to slide up and down to cooperate with the lifting of the horizontal tray 9.

The upper part of the front closing plate 19 is provided with avoidance holes 19b corresponding to the ends of the C-shaped hook pin shafts 16. An escape hole 19b in the upper portion of front closure plate 19 allows a screwdriver to be inserted into a slotted slot 16a in C-hook pin 16 to rotate C-hook 15.

The top and the bottom of the two floating vertical plates 6a are respectively provided with a damping block 6d so as to avoid large impact on the top plate 3 when the floating frame 6 rises to the highest position; or cause a large impact on the base when dropped.

The front part of the base 1 is provided with a front handle 21 standing upwards, and the upper part of the rear side of the upright post 2 is provided with a rear handle 22, so that an operator can hold and push the material vehicle to advance to a target station conveniently.

A male buckle 23 extending forwards is arranged in the middle of the front end of the base 1, and an elastic female buckle 24 into which the male buckle 23 can be inserted is arranged in the middle of the rear end of the base 1. The male buckle 23 of the next material vehicle is inserted into the elastic female buckle 24 of the previous material vehicle, so that the plurality of material vehicles are connected end to end, and the plurality of material vehicles can be pushed at one time. The male buckle 23 is a bolt with a downward end, the elastic female buckle 24 comprises a straight plate hinged to the middle of the rear end of the base 1, a bolt hole is formed in the rear end of the straight plate, and a support spring is arranged below the front part of the straight plate; when the two vehicles are connected, the rear end head of the straight plate is pressed downwards, the pin of the male buckle 23 of the rear vehicle is inserted into the pin hole of the straight plate, the straight plate is loosened, the support spring bounces the straight plate upwards, and the pin hole of the straight plate is sleeved to the root of the pin of the male buckle 23.

Two ends of the cross rod 8 are respectively screwed with knob screws 8a, and the ends of the knob screws 8a extend backwards and are provided with rubber heads. After the material box is mounted at the loading station of the material vehicle, the knob screw 8a is rotated, so that the rubber head at the rear end of the knob screw 8a is tightly propped against the upright post 2, the positions of the floating frame 6 and the horizontal tray 9 are locked, and the phenomenon that the material box above the material vehicle jumps up and down due to bumping of the horizontal tray 9 in the advancing process of the material vehicle is avoided, so that the material box falls.

Fig. 9 and 10 show a second embodiment of the invention, wherein guide rollers 6e and centering rollers 6f are respectively fixed on the outer sides of two floating vertical plates 6a, the axis of the guide roller 6e extends in the front-rear direction, the axis of the centering roller 6f extends in the left-right direction, the upper and lower guide rollers 6e on the same side are supported on the bottom wall of the U-shaped groove 2b, each side is respectively provided with an upper and lower pair of centering rollers 6f, each pair of centering rollers 6f is respectively supported on the front and rear side walls of the U-shaped groove 2b, and the U-shaped groove 2b is fixed on the corresponding upright post 2. Because the horizontal tray 9 is in a cantilever structure, a larger unbalance loading moment can be formed after the material box is placed on the horizontal tray 9; when the horizontal tray 9 carries the material box to go up and down, the two sides of the floating frame 6 go up and down along the U-shaped groove 2b through the guide rollers 6e and the righting rollers 6f, so that on one hand, the lifting is guaranteed to be very stable, on the other hand, the righting rollers 6f are supported on the front side and the rear side of the U-shaped groove 2b, and can bear larger unbalance loading moment, and the material box is guaranteed to be in a horizontal state.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.

Claims

1. The utility model provides a self-balancing material car, includes the base, the base below is equipped with the wheel, the rear end both sides of base are connected with the stand that upwards stands respectively, and roof interconnect, its characterized in that are passed through at the top of two stands: a lifting floating frame is arranged between the two upright posts and comprises floating vertical plates positioned on the inner sides of the upright posts and floating bottom plates connected to the lower ends of the two floating vertical plates, and the front side and the rear side of the tops of the two floating vertical plates are respectively connected with each other through floating top frame plates; the lower part of the floating frame is symmetrically connected with vertical short plates extending forwards, the front ends of the vertical short plates at two sides are connected with each other through a cross rod, and a horizontal tray extending forwards is mounted on the cross rod; the floating frame is provided with a counterweight device; the counterweight device comprises a counterweight rod, a steel wire rope and a fixed pulley, the fixed pulley is fixed below the top plate, the middle section of the steel wire rope is wrapped on the fixed pulley, one end of the steel wire rope is connected with the floating frame, the other end of the steel wire rope is connected with the counterweight rod, and a plurality of counterweight blocks are fixed on the counterweight rod; the total weight of the counterweight rod and each counterweight block is equal to the no-load weight of the floating piece.

2. The self-balancing material cart of claim 1, wherein: the outer sides of the two floating vertical plates are respectively fixed on the sliding blocks, the two sliding blocks are respectively supported on the vertical guide rails, and the two vertical guide rails are respectively fixed on the corresponding stand columns.

3. The self-balancing material cart of claim 1, wherein: the outer sides of the two floating vertical plates are respectively fixed with a guide roller and a centering roller, the axis of the guide roller extends along the front-back direction, the axis of the centering roller extends along the left-right direction, the guide roller and the centering roller are respectively supported in corresponding U-shaped grooves, and the U-shaped grooves are fixed on corresponding stand columns.

4. The self-balancing material cart of claim 1, wherein: the stand is wire rod, panel or section bar, the surface of stand is equipped with the vertical type groove that extends of multichannel edge, the left and right sides both ends symmetry of counterweight rod has connect soon the direction head, the outer end symmetry of both sides direction head inlay in the type groove of stand.

5. The self-balancing material cart of claim 1, wherein: the upper edges of the two floating top frame plates are correspondingly provided with a plurality of V-shaped caulking grooves; the floating bottom plate is connected with a plurality of balance weight springs, the upper ends of the balance weight springs are respectively fixed with a spring fastener, the lower part of each spring fastener is positioned between the two floating top frame plates, the upper part of each spring fastener is respectively placed in the V-shaped caulking groove of the floating top frame plate, and the middle part of the upper end of each spring fastener is respectively provided with a hook hole; each spring buckle is respectively matched with a C-shaped hook which can be screwed into the hook hanging hole, the upper end of each C-shaped hook is fixed on a C-shaped hook pin shaft, each C-shaped hook pin shaft is respectively fixed on a C-shaped hook fixing frame, and the C-shaped hook fixing frame is fixed below the top plate; the driving end of each C-shaped hook pin shaft is provided with a straight groove, a cross groove, a hexagonal head, a square tenon or a tool-free quick-rotation device.

6. The self-balancing material cart of claim 5, wherein: the upper end of each C-shaped hook is respectively provided with a semi-circular arc head coaxial with the C-shaped hook pin shaft, each semi-circular arc head is pressed with a rotation stopping reed, and the root of each rotation stopping reed is fixedly connected below the top plate.

7. The self-balancing material cart of claim 5, wherein: the elastic coefficients of the counterweight springs are the same or different.

8. The self-balancing material cart of claim 5, wherein: the rear end faces of the two stand columns are covered with rear sealing plates, the front end faces of the two stand columns are covered with front sealing plates, front sealing plate long grooves extending vertically are symmetrically formed in the front sealing plates, the two vertical short plates penetrate out of the corresponding front sealing plate long grooves respectively, and avoidance holes corresponding to the ends of the C-shaped hook pin shafts are formed in the upper portions of the front sealing plates.

9. The self-balancing material cart of any one of claims 1-8, wherein: the top and the bottom of the two floating vertical plates are respectively provided with a damping block, the front part of the base is provided with a front handle which is erected upwards, and the upper part of the rear side of the upright post is provided with a rear handle; a male buckle extending forwards is arranged in the middle of the front end of the base, and an elastic female buckle into which the male buckle can be inserted is arranged in the middle of the rear end of the base; knob screws are respectively screwed at two ends of the cross rod, and rubber heads are arranged at the rear ends of the knob screws.