KR970000176B1 - Pallet lift truck - Google Patents

Abstract

No content.

Description

Parit lift truck

1 is a side view of a jack device portion showing one embodiment of the present invention.

2 is a side view of the whole.

3 is the same top view.

4 is the same front view.

5 is a rear view of the jack device.

6 is an exploded perspective view of the same.

7 is a cut away perspective view of the same part.

8 is a perspective view of a pumping handle portion.

9 is a plan view of a hydraulic base.

FIG. 10 is an explanatory diagram of a lever that replaces a lift operation valve. FIG.

11 is a sectional view of a lift operation valve.

12 and 13 are explanatory views of the attachment of the pumping handle.

The present invention includes, for example, a fork-shaped carrier having a front wheel at the tip and a jack device supporting the rear wheel at the bottom and lifting the rear end of the loaded carrier by lifting the cylinder. It includes a plunger pump and operates the flanger pump, which swings the pumping handle forward and backward, drives the lift cylinder to raise the loaded carrier, lifts the load on the parit on the upper side of the carrier, and pumps. It relates to a lift truck for moving by pushing and pulling the handle.

Conventionally, there has been a technique of supporting a carrier by a hydraulic cylinder having a ram-shaped piston, but only when the carrier is lowered by contacting the piston at the bottom, the carrier is a projection of the ground. Since it was supported, there was a safety problem such as only moving down the psoton and leaving the carrier.

In addition, there has been a technique of changing the elevating angle control valve by installing a push rod protruding from the hydraulic base for disposing the electric cylinder and the flanger pump, connecting the electric rod to a change lever installed on the pumping handle.

By the way, since the hydraulic operation arm which abuts against the push rod and the chain connecting to the lever to be changed are completely fixed by bolts, adjustment of machining errors such as the protrusion amount of the push rod described above is easily performed. There was problem in function such as impossible.

In addition, although the lever was attached to the cap installed at the upper end of the handle, the cap was not easily attached or detached, and there were problems in handling such as attachment of the lever.

As a ferry lift truck which loads a parit loaded with loads and is moved by a worker by pushing and pulling, the structure based on the simplification of the jack device structure which raises and lowers the load and the reduction of manufacturing cost, and the improvement of the safety and function of the conveying work. Improvements are preferred.

Therefore, in the parit lift truck, a flow path for shorting the inside of the inflow cylinder to the oil tank forms an opening between the lower end and the side of the piston, and a spherical body is inserted into the notch of the upper end of the piston, so It is not necessary to install the packing at the lower end of the piston to be inserted into the hydraulic cylinder, and it is not necessary to form the upper end of the piston to be brought into contact with the carrier, and the piston shape can be simplified to reduce the manufacturing cost easily. Can be.

Moreover, since the bolt which engages this piston is attached to the carrier so that a piston may be prevented from being pulled out, when a carrier is lowered, only a piston can be prevented from falling and disengaging, and it can handle safely. In addition, the hydraulic operation arm for changing the elevating operation valve and the chain connecting to the lever for changing the pumping handle are connected as bolts, and the nut for screwing onto the electric bolts is brought into contact with the lower arm only. Therefore, it is possible to easily perform fine positioning of the operating arm so that the changing lever is placed in the neutral position, and the hydraulic operating arm can be adjusted by simply tightening the electric nut while teasing the pumping handle.

In addition, since the supporting point of the lever to be changed and the notch for engaging the lever are installed in the cap, the cap is fixed to the upper side of the pumping handle so that it can be detachably detached as a bolt. In addition, the attachment and disassembly of the above-mentioned changing lever can be easily handled.

In addition, a flange supporting the hydraulic operation arm is installed on the hydraulic base, and the outer side of the contact portion between the push rod disposed on the hydraulic base and the operated operation arm is surrounded by an electric flange. The operation arm can prevent obstacles from being pushed by the push rod by hitting the obstacle, and can prevent the mud from sticking to the connection part of the push rod and the operation arm. . In addition, the guide pin for connecting the hydraulic operation arm and the lever for switching by a chain and for guiding the chain by guiding the chain which is operated at the time of pumping handle operation is provided. The point shafts and the guide pins are arranged in a straight line facing each other. Therefore, the point shafts can be installed at both ends to insert the guide pins so that the pumping handle can be stably supported. The handle is operated in a state in which the chain is bent and the operating arm is fixed, and the attachment structure of the pin and the point shaft is simply configured by bringing the point shafts into contact with both ends of the guide pin.

In this way, a lift cylinder having a hydraulic cylinder structure for supporting the bearing, a hydraulic base structure for attaching the hydraulic cylinder and the flanger pump and an oil tank, and a pumping handle attachment structure, and a suction port, a pressure port, and a squeeze port The structure and the lever on the upper side of the pumping handle and the chain supporting structure connected to the lever make it possible to easily simplify each structure, reduce manufacturing costs, and improve the safety of the transportation work and the lift function. .

EMBODIMENT OF THE INVENTION Below, the Example of this invention is described based on drawing.

1 is a side explanatory view of the main part, 2 is a side view of the whole, 3 is a coplanar view, 4 is a sympathetic view, 5 is a back explanatory view, (1) is a front wheel for driving at the tip (2) (2) Fork racks in the form of forks of two crotch, which are attached to protrude downward, (2) bear the driving rear wheels (4) and (4) at the lower part, and the rack (1) Jack device for supporting the rear end of the vehicle and lifting it, (5) is a hydraulic cylinder for attaching the rear wheels (4), (4) via the axle (6) to the lower cylinder head (5b), (7) Piston ram form to contact the bearing portion 8 of the bearing 1 via the spherical body 9, the hydraulic cylinder 10 is fixed approximately horizontally in the middle of the cylinder (5), (11 ) Is installed so as to rotate freely in the periphery of the cylinder (5) below the hydraulic cylinder (10), and the homology of the piston (7) A bearing plate connecting the arm 12 and the rod 13 protruding the front wheel 2 in proportion to the oil plate 14 is an oil tank built around the cylinder 5 on the upper surface of the hydraulic cylinder 10. 15 is a flanger pump for conveying pressure oil to the cylinder 5, 16 is a handle bracket which is built in the upper part of the rear of the tank 14, and 17 is a bracket 16. The handle base (21), which is supported by the rotation design pin (18) and is supported by the pressure roll (20) which is brought into contact with the flanger piston (19) of the pump (15), The pumping handle for lifting and pushing and pulling operation, which is connected to the handle base 17, which has a loop-shaped ratchet part 21a and is connected to the handle base 17, which is installed at the upper end, is a flanger piston (19). ) Is a returning spring that protrudes and supports the handle 21 upright.

The pumping handle 21 is installed in the tank 14 to which the electric pumping handle 21 is electrically mounted so as to be freed via the handle bracket 16. Moreover, the L-shaped flow path which short-circuits the hydraulic cylinder 5 inside the oil tank 14 via the drain port 5a as a raise limit position of the ram-shaped piston 7 mentioned above. The opening portion 7a is formed between the lower end surface and the side surface of the piston 7, and the spherical body 9 is inserted into the notch 7b of the upper end surface of the piston 7, and the supporting portion of the carrier 1 is supported. (8) is in contact with the bottom.

Moreover, in order to prevent the ejection of the above-mentioned piston 7, the bolt 8a which engages with the wheel groove 7c of the upper end of this piston 7 is installed in the support part 8 of the carrier 1. Doing.

Moreover, as the lower surface of the hydraulic cylinder 10 mentioned above, the stopper 10a is formed in the center substantially in the front-back direction, and the projection body 11a, 11a is erected on the left and right upper surfaces of the bearing plate 11 which were mentioned above. When turning the rear wheels 4 and 4 by operating the handle 21 provided above, the protrusions 11a and 11a are brought into contact with the stopper 10a as the left and right turning limits. The rear wheel 4 is configured to restrict the turning operation.

As shown in FIG. 9 and FIG. 11, the elevating operation valve 23 and the excessive amount of work prevention valve 24 are provided in the hydraulic base 10 mentioned above.

The tank port 26 is connected to the pump port 27 via the suction port 25 which is the electric operation valve 23, and the pressure port 28 which is the electric operation valve 23 is interposed. The pump pots 27 communicated with the cylinder pots 29, respectively.

In addition, the squeezing hole 32 is provided in the back pressure chamber between the pressure port 28 described above and the plug 30 for sealing it, and the squeezing hole 32 is interposed with the plug 30. The spring 33 which returns between the knitting spheres 32 is provided in tension, and the squeezing sphere 32 is brought into contact with the pressure sphere 28 by this spring 33 force.

In addition, the elevating operation valve 23 is disposed in the base 10 between the electric pump 15 and the tank 14, and the suction port 25 and the pressure port (constituting the valve 23) ( 28) and the pinch are arranged in a direction substantially parallel to the axle 6 in which the sphere 32 is placed.

When the electric flanger pump 15 is operated, the hydraulic oil of the tank 14 is sucked into the pump 15 through the suction port 25 and resisted against the spring 33 to return. 28 is operated to convey the hydraulic pressure from the pump 15 to the cylinder 5.

In addition, a squeezing passage 31a and a tapered passage 31b are formed in the inner hole side of the valve seat 31 formed in a cylindrical shape, and the squeezing sphere 32 is placed in the squeezing passage 31a to be extremely positioned. The oil pressure in the cylinder 5 is gradually returned to the tank 14 by a small gap and the oil is slowly returned to the tank 14. The ladle 1 is lowered, and the taper passage 31b is opposed to the spring 33. By moving the squeezing sphere 32), the cylinder 5 and the oil are greatly decompressed to return to the tank 14 rapidly, and the carrier 1 is lowered at a high speed.

In addition, the valve seat 31 mentioned above is plated and fixed by the spring 31c.

In addition, a push rod 34 for pushing and pulling out the operation valve 23 is pressed, and the suction rod 25 is pushed in against the return spring 35, so that only the suction port 25 is sucked. First, it is kept open, and the operating valve 23 is put into a neutral operation state so as to drive the flanger pump 15, while the push rod 34 is further pushed in and sucked in the suction hole 25. In response to the hydraulic pressure brought into contact with the pressure port 28 and returned from the cylinder 5, the pressure port 28 is opened, and the cylinder port 29 is conducted to the tank port 26, The cylinder 28 and the squeeze are configured to cause the cylinder 5 to return the pressure oil to the tank 14 as the desired hydraulic pressure by the hydraulic squeeze action by the scoop 32.

In addition, as shown in FIGS. 8, 10, 12, and 13, one end of the push rod 34 is provided so as to protrude out of one side of the hydraulic base 10, and the handle 21 is provided. The chain lever 43 is connected to the changing lever 37 installed at the upper end of the chain by the chain 43, and the chain is intersected with the axis line of the point pin 18, which is the point axis of the handle 21. The guide pin 44 which supports and supports the 43 is provided.

In addition, the cap 36 is fixed to the upper end of the pumping handle 21 via a bolt 36a so as to be freely attached and detached, and the proximal end of the lever 37 for changing the hydraulic control valve 23 in the inner space of the cap 36 is fixed. Inserts and slides the proximal end of the lever 37 delivered with the pin 38 secured to the cap 36, which is fixed to the cap 36, and hangs in the inner space of the handle 21. ) Is inserted so as to be able to flow, and the hook portion 39a at the upper end of the rod 39 is hooked to the recessed portion 37a at the upper recess of the lever 37.

Then, the hydraulic base arm having an intermediate end of the arm 40 is brought into contact with one end of the L-shaped hydraulic operation arm 40 at the outer end of the push rod 34 protruding from the side of the hydraulic base 10. The bearing 10b is supported by the flange 10b via the pin 41, and the outer side of the place where the arm 40 and the push rod 34 come into contact with each other is surrounded by the flange 10b. In addition, the other end of the arm 40 described above is installed on the upper surface of the hydraulic base 10 between the oil tank 14 and the flanger pump 15, and is intended to be suspended from the other end of the arm 14. Fix the bolt 42 to the length operation.

In addition, the nut 42a, which is screwed to the lower end of the bolt 42, is brought into contact with the arm that is provided only at the bottom, and between the rod 39, the lower end, and the upper end of the bolt 42. Is connected by the chain 43, so that the chain 43 is bent in the swinging direction of the handle 21 and hanged freely.

In addition, the ends of the left and right rotation point pins 18 and 18 are inserted into the inner bearings 16a and 16a of the handle bracket 16, and the inner bearing 16a of the handle bracket 16 is inserted. Guide pins 44 for the chain 43 are hypothesized between the first and second end pins 18 and 18 of the handles 21 and 16a. To face the end surface of the point pins 18, 18, and guide pins 44, which have been disposed, are arranged in a substantially straight line. When the handle 21 is swung and rotated by using the pins 18 and 18 as the point, the chain 43 is abutted by bringing the middle of the chain 43 into contact with the pin 44. To prevent the chain 43 from contacting the flanger pump 15, and to match the shafts of the electric pins 18 and 18 with the portion of the chain 43, The chain 43 is squeezed in a state where the aforementioned valve 23 and the arm 40 are stopped at a predetermined position, and the handle 21 is swung to form an operation of the flanger pump 15.

In addition, the ascending operation notch 45 and the neutral operation notch 46 for engaging the lower middle edge of the lever 37 described above are formed by the open holes 47 of the cap 36, and the aforementioned ascending operation. On the upper side of the notch 45, the lower operation notch 48 is formed and the circular hole guide 49 which connects the upper side of the neutral operation notch 46 and the lower operation notch 47 is formed with the open hole 47, By engaging the above-mentioned lever 37 with the lift operation notch 45, the tank port 26 and the pump port 27 are closed by the suction port 25 of the switching valve 23, The push rod 34 is pushed in while the valve 23 is shifted to the lift operation to perform the pumping operation, while the lever 37 is engaged with the neutral operation notch 46 as shown in FIG. The suction port 25 is opened to conduct each of the pods 26 and 27 to switch the valve 23 to the neutral operation state. When the hydraulic pressure of the cylinder 5 is abnormally high by the air operation of the flanger pump 15, the relief valve is opposed to the spring 50 of the excessive amount prevention valve 24 of FIG. 51 is opened, and the cylinder 5 is comprised so that it may flow out to the oil tank 14 through the valve 24 by which the high pressure oil was transmitted.

Also, as shown in FIG. 7, the oil filter 52 is fixed to the opening of the oil tank 14, which is the tank port 26, and an oil cap 53 is provided on the oil tank 14 upper surface.

The present embodiment is constructed as described above, and when a load loaded on a parit (not shown) or the like is loaded on the carrier 1, the lever 37, which the hydraulic operation changes, is fitted to the lifting operation notch 45 to stand up and installed. When the pumping handle 21 is swung about the point pin 18 to perform the pumping operation, the hydraulic oil of the tank 14 is sucked into the flanger pump 15 via the suction port 25. The pressure oil of the flanger pump 15 is fed to the cylinder 5 via the pressure port 28, and the ram piston 7 protrudes to homolog the bearing 1.

Then, when the loaded carrier 1 rises to the rising limit position and the ram-shaped piston 7 is in the maximum protruding state, the drain pot 5a of the cylinder 5 and the flow path 7a of the piston 7 The oil in the flanger pump 15 conveyed to the cylinder 5 via the oil inflow into the tank 14 is interrupted, and even if the operation of the pump 15 is continued, the piston 7 stopped at the maximum rising position. Is supported.

In addition, when the carrier 1 is moved in a state of being raised to an appropriate height as in the case of electricity, the previously changed lever 37 is engaged with the neutral operation notch 46, and the push rod 34 is provided via the operation arm 40. ), The suction hole 25 is opened and supported, and the valve 23 is changed to a neutral operation state, so that the flanger pump 15 is operated by air even when the handle 21 is raced. , The ram piston 7 and the carrier 1 are fixedly supported, and in this state, the handle 21 is pushed and pulled to carry the load.

In the middle of the chain 43 connecting the suspended rod 39 and the bolt 42 when killing the handle 21 around the point pin 18 as described above, and performing lifting and pulling operations. A middle portion of the chain 43 positioned on the axial center of the point pin 18, which is in contact with the point 44, and thus, regardless of the displacement of the handle 21 about the point pin 18, The operation arm 40 and the push rod 34 are stopped and held at a fixed position.

Furthermore, when lowering the load carrier 1 and pulling down the load loaded on the parit or the like, the upper edge of the lever 37 is brought into contact with the arc guide 49 by pulling up the lever 37 for changing. By the guidance of the lever 37 is moved to the lower operation notch 48.

Then, the push rod 34 is pushed by displacing the operation arm 40 through the suspended rod 39 or the like, and the suction port 25 is brought into contact with the pressure port 28 to press the pressure port 28. , The cylinder 5 returns the pressure oil to the tank 14 at a flow rate proportional to the operation of the lever 37, which is operated by the squeezing action by the pressure sphere 28 and the squeezing sphere 32. Lever, which was pushed into the lower operation notch 45 while removing the lever 37, which had been retracted from the piston 7 in the ram form at the desired speed and lowered the bearing 1. 37) is engaged and causes the valve 23 to be moved to the ascending operation state.

In addition, when the lifting cylinder 5 is lifted up by the pumping operation of the handle 21 described above, and the lifter 1 is lifted up, when the load of the carrier 1 is greater than the setting of the spring 50, When the excess amount of hydraulic fluid to be pumped from the pump 15 to the cylinder 5 is opened to the tank 14 by opening the relief valve 51, the carrier 1 is loaded when the load is heavier than specified. It is supported in the lowered position.

In addition, when the carrier 1 lowers when the pumping handle 21 is not operated, or when the carrier 1 does not rise even when the handle 21 is operated, dust is attached to the pressure port 28 or the like. Lever (37) is put into the lower operation notch (48), and the handle (21) is increased several times by quick operation, or the lever (1) is changed to the state of raising the uppermost position. 37) is put into the lowering operation notch 48 quickly, and the dust adhering to the suction hole 25 or the pressure hole 28 or the squeeze hole 32 is removed.

In addition, when disassembling and assembling the elevating operation valve 23 and the hydraulic operation arm 40, the operation is performed by putting the changing lever 37 into the neutral operation notch 46 and pumping the handle 21. While tightening the nut 42a for connecting the bolt 42 to the arm 40 and not lifting the carrier 1 by the handle 21 operation, the nut 42a that is to be tightened is only rotated one more time. The electric valve 23 adjustment at the time of assembly is performed.

As evident in the above embodiment, the present invention forms an opening between one end surface and the side surface of the piston 7 while opening an oil passage 7a for shorting the inside of the hydraulic cylinder 5 to the oil tank 14. Since the spherical body 9 is inserted into the notch 7b of the upper end of the piston 7, and the bearing 1 is brought into contact with the lower part, there is no need to install a packing on the lower end of the piston 7 to be inserted into the hydraulic cylinder 5. The manufacturing cost can be easily reduced by making the shape of the piston 7 simple, without having to form the upper surface of the piston 7 which abuts on the carrier 1 in spherical form.

Moreover, since the bolt 8a which engages with this piston 7 was installed in the carrier 1 so that the piston 7 may be prevented | released, only the piston 7 will descend | fall, and it will detach | deviate when the carrier 1 is lowered. Can be prevented and handled safely.

In addition, while connecting the hydraulic operation arm 40 for changing the elevating operation valve 23 and the switching lever 37 of the pumping handle 21 and the chain 43 and the bolt 42, Since the nut 42a for attaching the screw 42 to the bolt 42 is brought into contact with the arm 40 that has been screwed on only from the bottom, the changing lever 37 is placed in a neutral position, while the pumping handle 21 is extended. The hydraulic operation arm 40 can be adjusted in position only by removing the above-mentioned nut 42a, and fine positioning of this operation arm 40 can be performed easily.

Further, the point of the lever 37 to be changed and the notches 45, 46, and 48 for engaging the lever 37 are installed in the cap 36, and the cap 36 is pumped handle 21. Since it is fixed to detachably as a bolt 36a at the upper end, the cap 36 can be easily detached and attached to the upper end of the pumping handle 21, and can be easily handled such as attachment and disassembly of the changing lever 37. Can be.

Moreover, the flange 10b which supports the hydraulic operation arm 40 is provided in the hydraulic base 10, and the outer side of the contact part of the push rod 34 which is arrange | positioned at this hydraulic base and the operation arm 40 mentioned above. Since it is surrounded by the flange (10b) of the electrical movement, the operation arm (40), which has been delivered during movement, can be prevented from being inconvenient to be pushed by the push rod (34) by hitting the obstacle, and the push rod (34) with the electric Mud etc. can be prevented from adhering to the connection part of the operation arm 40, and can be handled safely.

In addition, the guide pin 44 which connects the hydraulic operation arm 40 and the lever 37 to be changed by the chain 43, and also decorates and guides the chain 43 which has been operated at the time of the pumping handle 21 operation is provided. In the installation structure, the end surface of the pump shaft (21) and the end surface of the guide pin (44) and the end face of the guide shaft (44) face each other, the point shaft (18) and the guide pin (44) Since it is disposed in a substantially straight line, it is possible to stably support the pumping handle 21 by installing point shafts 18 at both ends so as to sandwich the guide pins 44 interposed therebetween, and to the guide pins 44. The handle 43 is operated by fixing the chain 43 to fix the operation arm 40. The pin 43 is brought into contact with the point shaft 18 at both ends of the guide pin 44. 44 and the attachment structure of the point shaft 18 can also be simply configured. In this way, the hydraulic cylinder (5) structure for holding the carrier 1, and the hydraulic base (10) structure for attaching the hydraulic cylinder (5) and the flanger pump (15) and the oil tank (14), and the pumping handle (21) ), And a lift valve (23) structure having a suction hole (25) and a pressure hole (28) and a squeezing hole (32), and a switching lever (37) on top of the pumping handle (21). In the supporting structure of the chain 4 connected to the lever 37, it is possible to simplify the structure and reduce the manufacturing cost, to improve the safety of the transportation work and the lift function.

Claims (7)

It has a ram-shaped piston that holds the fork-shaped back end of the fork, and the hydraulic cylinder with the piston is installed upright, and the hydraulic base to which the flanger pump and the oil tank are attached is approximately horizontal in the middle of the cylinder. Handle bracket to the tank to which the pumping handle which operates the pump is operated by fixing the oil tank around the cylinder of the upper width of the hydraulic base and the rear wheel through the axle at the lower end of the cylinder. The vehicle is installed so as to fall backwards freely through the air conditioner, and a lift operation valve is installed on the hydraulic base between the pump and the electric tank, and the suction port, the pressure port, and the squeezing port constituting the valve are posted. And a push rod which is arranged in a direction substantially parallel to and opens each of the spheres described above. To the outside of the hydraulic base by connecting the lever installed on the upper side of the handle and the rod to the side of the hydraulic base by the chain, and the guide to install and support the chain so as to intersect the point axis core of the handle. A lift truck equipped with pins. The oil passage according to claim 1, wherein a flow path for shorting the hydraulic cylinder inside the oil tank is opened between the lower end surface and the side surface of the piston as the upward limit position, and the spherical body is placed in the notch of the piston upper surface. A lift truck, characterized in that abutting on the lower side. The pallet lift truck according to claim 1, wherein a bolt for engaging the piston is provided on the carrier to prevent the piston from slipping out. The method according to claim 1, wherein one end of the hydraulic operation arm is brought into contact with the push rod protruding from one side of the hydraulic base to connect the other end of the arm and the chain with a bolt, and to be screwed with an electric bolt. A parit lift truck, wherein the nut is brought into contact with the arm from the bottom only. The ferry lift truck according to claim 1, wherein a point of the lever to be changed and a notch for engaging the lever are provided in the cap, and the cap is fixed to the pumping handle on the upper side so as to be freely attached or detached. The pallet lift truck according to claim 1, wherein a flange for supporting the hydraulic operation arm is provided on the hydraulic base, and the outer side of the contact portion between the arm and the push rod is surrounded by an electric flange. The guide pin of the chain is fixed to the handle bracket fixed to the oil tank so that the point shaft tip end face of the pumping handle and the end face of the guide pin side described above are roughly aligned. A parit lift truck, which is disposed in a straight line.

Images