KR0122877B1 - Fork lift truck of cylinder type mast - Google Patents

Abstract

Disclosed is a fork lift truck having a cylinder type mast. The fork lift truck comprises a cylinder type mast 60, a lower frame 61, a tilt cylinder 18, a carriage assembly 15 and a head cover 69, 70. The cylinder type mast 60 includes plural cylinders which co-operates by oil pressure. The lower frame 61 which is rotatively coupled with a car body supports the lowest cylinder of the mast 60. The tilt cylinder 18 is installed between the car body and the lower frame 61 as a state of expanding/contracting to tilt the master 60. The carriage assembly 15 is assembled at outer side of the upper cylinder of the mast 60 to carry, to rise and to fall. Thereby, the mast 60 has even weight regardless its location, so that safe and efficient carrying is performed.

Description

Forklift with multi-stage cylindrical mast

1 is a side view of a conventional forklift.

2 is an exploded perspective view of a conventional mast component.

3 is a side view of the forklift of the present invention.

Figure 4a is an assembled front view of the multi-stage cylindrical mast of the present invention, the fork lowered.

Figure 4b is an assembly side view of Figure 4a.

Figure 5a is a front view of the assembly of the multi-stage cylindrical mast of the present invention, the fork is raised.

FIG. 5B is a side view of FIG. 5A.

FIG. 5C is an assembly plan view of FIG. 5A. FIG.

Figure 6 is an exploded perspective view illustrating the assembly of the carriage assembly installed in the multistage cylinder of the present invention.

Figure 7 is an exploded perspective view illustrating the assembly of a multi-stage cylinder installed in the lower frame of the present invention.

8 is a detailed view of the lower frame of the present invention.

9 is a detailed view of the multistage cylinder of the present invention.

10 is a hydraulic line circuit configuration of the present invention.

Figure 11 is a circuit diagram installed on the head cover of the right multistage cylinder of the present invention.

12 is a circuit diagram installed in the head cover of the left multi-stage cylinder of the present invention.

13 is an assembled state of the corrugated tube of the present invention.

14 is an assembly state of the multi-stage cylindrical mast and the tilt cylinder of the present invention.

15 is a detailed view of the tube assembly of the present invention.

16 is a detailed cross-sectional view of FIG.

17 is a cross-sectional view of FIG.

The present invention relates to a forklift truck having a multistage cylindrical mast.

The mast of a forklift truck is to perform a kind of position shifting work such as lifting a load on the ground, that is, lifting the article to a certain height, or lowering a load at a certain height to the ground.

In the conventional forklift mast that performs the above operation, as shown in FIG. 1, the mast 10 is installed at the front of the forklift F so that the mast 10 is operated by the driver's operation.

2 is an exploded perspective view of a conventional mast component, the mast 10 is largely connected to the vehicle body to form a skeleton of the mast 10 and the stencil by the lift cylinder 12 An inner beam 13 which is lifted and operated in the nary beam 11, a carriage assembly 15 which is installed inside the inner beam 13 and lifted and operated by the chain 14, and connected to the carriage assembly 15. And a backrest 16 and a fork 17 for supporting and loading the load, and a tilt cylinder 18 connected to both sides of the standard beam 11 and the vehicle body to tilt the mast 10 back and forth.

The above-described configuration will be described in detail with reference to the drawings. The lift cylinder 12 has a stroke for determining the height of the mast 10 (the height of the forks 17 can rise to a certain height from the ground). It has a function of raising and lowering the beam 13. In such a case, two lift cylinders 12 are usually provided, one for each side.

Reference numerals 19, 20 and 21 are reinforcing bar assemblies. The reinforcing bar assemblies 19, 20 and 21 are members for supporting and fixing the beams on both sides of the standard beam 11, and the connecting member 22 formed on one side of the upper reinforcing bar assembly 19 will be described later. The chain bolt 23 is supported. And both sides of the lower reinforcing bar assembly 21 is formed with a white paper hole 24 to assemble the entire mast 10 to the vehicle body of the forklift (F).

Upper and lower reinforcement bar assemblies 25 and 26 are formed at upper and lower sides of the inner beam 13 to support and fix both sides of the inner beam 13, and a chain sheave 27 is disposed at one lower side of the upper reinforcement bar assembly 25. ) Installation connecting member 28 is installed.

Reference numerals 29 and 30 show bearings and a number of shims, which bearings 29 and 30 are inner beams 13 and lift cylinders with respect to the standard beam 11. 12) has a function to become a rolling friction during the ascending and descending operation, to match the assembly tolerance by increasing or decreasing the shim (30). Reference numerals 31 and 32 are pins for fixing the bearing 29 by welding to the standard beam 11 and the inner beam 13, respectively.

Reference numeral 33 is a connector, a port for inputting a flow rate from the vehicle to the mast 10, the regulator 34 through the flow rate control when the mast 10 is lowered (ie, after the fork 17 is raised). A device for maintaining a constant lowering speed of the fork 17, the regulator 34 is fixed to the middle steel reinforcement bar assembly 20 of the standard beam 11 with a bolt 35, washer 36.

The tube assemblies 37 and 38 serve to guide the flow rate to the left and right of the lift cylinder 12, and the elbows 39 and 40 are connected to the tube assemblies 37 and 38, and the elbows 41 and 42 are connected to the tube assemblies 37 and 38, respectively, and are connected to the lower portions of the left and right lift cylinders 12, and a protector 43 between the tube assembly 37 and the elbow 41 on one side. The lower speed of the fork 17 when the protector 43 breaks the hydraulic line of the mast 10 due to a sudden accident during operation of the forklift F and when the fork 17 is generated in an up state. It functions to prevent safety accidents by dropping.

Reference numeral 44 in the figure shows a seal O-ring, and serves to prevent leakage at the connection portion of each hydraulic line. Reference numeral 45 denotes an assembly assembly for fixing the lift cylinder 12 to the standard beam 11, and the assembly assembly 45 protects the lift cylinder 12 from a buckling load.

The pad 46 and the shim 47 have a spacer function as a pad 46 as a gap generated after assembling the standard beam 11 and the inner beam 13, and thus the inner beam from the standard beam 11. (13) This lift has the function of eliminating the instability of moving.

The bolt 48 and the washer 49 fix the end of the rod 12a of the lift cylinder 12 to the upper reinforcing bar assembly 25 of the inner beam 13.

Meanwhile, the carriage assembly 15 assembles the bearing 29 and the shims 30 to the left and right three pins 32, respectively, and then the inner assembly of the inner beam 13 and the connection fixed to the carriage assembly 15. The pin 50 and the spring pin 52 are connected to the member 50 so that the lift cylinder 12 can be lifted according to the operation of the lift cylinder 12. The back rest 16 is attached to the carriage assembly 15 with the bolt 53 and the washer. Fix it with (54), and install it with the fork 17 on the backrest 16.

The chain sheave 17 for guiding the chain 14 serves to increase the speed of the lift cylinder 12 twice when supporting the load on the chain 14 and to double the speed of the chain 14. One end of the chain bolt 23 is connected to the pin 51 and the spring pin 52, the chain bolt 23 is inserted into the connecting member 22 of the standard beam 11 to the nut 55 When the inner beam 13 is raised (or lowered) by the lift cylinder 12, the other side is fixed and connected to the carriage assembly 15 by pins and spring pins. Or descent).

The pin assembly 56 supports the chain sheave 27 and induces smooth rotation of the chain 14, and the bolts 57 and washers 58 prevent the pin assembly 56 from falling out in the axial direction during operation. Function

The conventional mast 10 constructed and operated as described above has the following problems.

First, as the various components constituting the mast 10 are listed as described above, the number of parts and the number of parts are too much to assemble, and, as a result, the parts cost and production cost are high. There is this.

Second, a gap necessary for operation is necessary between the standard beam 11 and the inner beam 13, which is not only difficult to manage and maintain the gap, but also requires a maintenance cost, and a large gap is generated. If it loses, the life of parts by each element is shortened due to the occurrence of noise and unbalanced load.

Third, in the flow path configuration of the mast 10, the respective connecting parts connecting the regulator 34 and the protector 43 are installed outside the lift cylinder 12 to have a complex structure of the overall appearance of the mast 10. In addition, the front of the forklift F by the standard beam 11 and the inner beam 13 and various components and connecting members (for example, the chain 14, the sine sheave 27, etc.) connecting them. There is a problem that makes the visibility very bad.

Fourth, since the mast 10 has a weight by the standard beam 11 and the inner beam 13 constituting the skeleton of the mast 10 and various components connected thereto, the forklift F Counterweights installed at the rear to maintain the balance also have a large weight together, which causes a problem that the weight of the forklift F as a whole becomes large.

The present invention has been made to solve the problems of the prior art as described above, the object of which is to greatly simplify the various parts used in the mast to significantly reduce the parts cost and assembly cost and thus the production cost, rolling noise and operation of the bearing It completely eliminates the noise caused by the gaps needed to extend the life of each element, prevents the unloading load, and integrates parts of the hydraulic circuit into the lift cylinder to make the hydraulic components compact, and according to the simplification of the entire mast structure The present invention provides a forklift with a multi-stage cylindrical mast that can greatly improve the front viewability of the forklift.

The present invention for realizing the above object can be solved by completely eliminating the skeleton of the mast in the form of a beam as in the prior art, and configuring a multi-stage cylindrical mast instead. That is, by connecting a pair of multi-stage cylindrical masts composed of several stages with reinforcement bars, the height of the cylinder is determined by the stroke of the cylinder, and the carriage assembly is mounted through the carriage fixing holder formed on the upper single-stage cylinder. According to the carriage and the carriage assembly is installed with the backrest, the lower three-stage cylinder is fixed to the lower frame by a fixing member to support the entire multistage cylindrical mast, and through the connecting member formed on the lower frame A hydraulic oil supplied from the vehicle by connecting the tilt cylinder through a tilt cylinder connecting member formed on the lower frame and connecting the tilt cylinder to tilt the multi-stage cylindrical mast, and embedding a regulator and a protector in the head cover of the three-stage cylinder. Is supplied through three-stage cylinder Will.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, the same or equivalent parts as in the prior art will be described with the same reference numerals.

3 shows a side view of the forklift of the present invention. As shown, the multi-stage cylindrical mast 60 installed at the front of the forklift F is connected to a lower frame 61, the lower portion of which is described below, and hinge hinges 62 fixed to both sides of the lower frame 61. Hinged through the body frame and the hinge, through the tilt cylinder connecting member 63 formed in the center of the lower frame 61 is connected to the tilt cylinder (18) connected to the body frame, the multi-stage cylindrical mast (60) tilted in the front and rear direction It is configured to be.

9 shows a multi-stage cylindrical mast 60 of the present invention, which is composed of a single stage cylinder 60a, a two stage cylinder 60b, and a three stage cylinder 60c from the top, as shown. Lifting operation is performed in the order of the first stage cylinder 60a, the second stage cylinder 60b, and the three stage cylinder 60c by the hydraulic oil flowing into the multi-stage cylindrical mast 60, and by the stroke according to the elevating operation The height of the multi-stage cylindrical mast 60 is determined.

And a pair of single-stage cylinder (60a) is connected to the upper reinforcement bar assembly 64, the two-stage cylinder (60b) and the three-stage cylinder (60c) is a reinforcing bar assembly (65, 66) at the rod end, respectively. It is configured to prevent the support and deformation of the multi-stage cylindrical mast (60), and the second stage cylinder (60b) and the three stage cylinder (60c) are foldable folds to prevent the chromium plating of the rod portion and foreign matter penetration When the tube 67 is installed (FIG. 5A), each end of the corrugated tube 67 is fixed with the clamp 68 as shown in FIG. 13 so that the second stage cylinder 60b and the third stage cylinder 60c are lifted in order. The folded corrugated tube 67 is unfolded in turn, and on the contrary, the unfolded corrugated tube 67 is folded in the order of the three-stage cylinder 60c and the two-stage cylinder 60b.

As shown in FIGS. 7 and 10 to 12, the head cover 69 ((70) formed with guide rods 69a and 70a at both ends of the rod of the three-stage cylinder 60c is assembled and welded. (Or assembling bolts), the fixing members 71 are welded and fixed to the head covers 69 and 70, respectively, and two bolt holes 71a are arranged in this fixing member 71 in a diagonal direction (X-direction). And tapered holes 71b, respectively, as shown in FIGS. 7 and 8, two bolt holes 71a formed at two sides of the fixing member 71 in diagonal directions on both sides of the lower frame 61; A bolt hole 61a and a tapered bean 61b corresponding to the data hole 71b are formed, and an insertion hole 61c corresponding to the guide rods 69a and 70a is formed at the center thereof, thereby forming the guide rod 69a. After inserting the 70a into the insertion hole 61c, the fixing member 71 is fixed to the lower frame 61 through the plurality of bolts 72 and the data pins 73 so that the multi-stage cylindrical mast 60 is the lower frame. Fixed to 61 The brackets 74 are welded and fixed to both sides of the lower frame 61, and the hinge pins 62 are welded and fixed to the brackets 74 so that the lower frame 61 is connected to the body frame through the hinge plate 62. The multi-stage cylindrical mast 60 as shown in FIG. 14 by hinged connection and connecting the tint cylinder 18 connected to the vehicle body frame through the tilt tilting cylinder connecting member 63 formed at the center of the lower frame 61. It is configured to tilt in the front-rear direction of the forklift F about the pin 62.

When the multi-stage cylindrical mast 60 is fixed to the lower frame 61 through the fixing member 71, the reason for fixing the taper pin 73 in the X-direction with the bolt 72 is the multi-stage cylindrical mast 60 ) Is weak as the bearing force of the bolt 72 (especially the bolt is weak for the force acting in the direction perpendicular to the axis) when the force to fall down, the tapered pin 73 prevents it, the bolt 72 is multistage The cylindrical mast 60 is to have a fixing function for the force in the axial direction.

The backrest 16 is fixed to both sides of the carriage assembly 15 with bolts 53 and washers 54 as in the prior art, and the carriage assembly 15 is installed in a multistage cylinder of FIGS. 5b and 6. As shown in the separation perspective illustrating the assembly of the single stage cylinder (60a) tube to secure the carriage fixing holder (75) of the upper, lower, left and right two, both four and the carriage assembly hole hole 75 (75) Welding and fixing the L-shaped connecting blocks 76 formed with corresponding locking portions 76a so as to be hooked onto the locking jaws 75a of the upper and lower portions thereof, and placing these connecting blocks 76 on the carriage fixing holder 75. The cover 77, the plurality of washers 78 and the bolts 79 are assembled and fixed, and the forks 17 are fitted to the carriage assembly 15 to be assembled. Accordingly, the carriage assembly 15 provided with the fork 17 and the back rest 16 is lifted together in accordance with the lifting operation of the multi-stage cylindrical mast 60.

As shown in FIG. 12, a cartridge-type protector 80 is built in the head cover 70 fixed to the lower part of the rod of the three-stage cylinder 60c to form a flow path, and a seal O-ring in the connector 81. Assembled after inserting (82), the cartridge type regulator 83 is built in the head cover 69 shown in FIG. 11, and then assembled after inserting the seal O-ring 82 into the connector 81 As shown in FIG. 10, the seal O-rings are inserted into the tube assembly 84 to the left and right, and then assembled to the connector 81 to form flow paths in the head covers 70 and 69.

The tube assembly 84 is composed of a rubber hose 84a and couplings 84b on both sides thereof, as shown in FIG. 15, so that the connector 81 is assembled to the coupling 84b.

Meanwhile, as shown in FIGS. 17 and 16, the elbow 85 receiving hydraulic oil supplied from the vehicle is inserted into the seal cover 69 by inserting the seal O-ring 82. Reference numeral 86 in the figure shows a plug assembled to the head cover 69.

In the present invention assembled and operated as described above, when the hydraulic oil discharged from the hydraulic pump of the vehicle is supplied through the elbow 85, the hydraulic oil is supplied to the multi-stage cylindrical mast 60 (right) of the one side head cover 69. At the same time, the hydraulic oil is supplied through the connector 81 of the head cover 69 to the connector 81 of the opposite head cover 70 via the tube assembly 84 and connected to the head cover 70. (Left), the multi-stage cylindrical mast 60 is lifted up in the order of the first stage cylinder 60a, the second stage cylinder 60b, the third stage cylinder 60c, and the third stage cylinder 60c in the reverse order when descending. , The second stage cylinder 60b and the first stage cylinder 60a are descended in this order (FIGS. 5 and 4).

Therefore, the fork 17 installed in the first stage cylinder 60a is to be made while the position is converted.

Meanwhile, the multi-stage cylindrical mast 60 has been described by combining 1,2,3 stage cylinders, but the present invention is not limited thereto, and the 1,2 stage cylinder or more cylinders may be combined according to the specifications of the forklift truck. The amount of mast can be determined.

The present invention as described above has the following effects compared to intramuscular masts.

First, since the multi-stage cylinder itself functions as a mast, the overall structure of the mast and its components can be simplified, which greatly simplifies the assembly process and greatly reduces the cost of parts and production costs.

Secondly, the operation of the mast is made by the cylinder hardly generates the operation noise according to the operation, and can extend the life of the component according to the operation, and can also prevent the unloading load.

Third, the regulator and protector are integrated in the head cover in the mast flow path configuration, and the components of the hydraulic circuit are simplified and the appearance is improved.

Fourth, the overall structure of the mast is simple, the appearance and the front field of view is largely secured to satisfy the workability and safety at the same time.

Fifth, counterweights that are installed at the rear of the forklift to maintain the balance can be reduced together with less weight than the conventional mast, and as a result, a compact forklift model can be developed.

As described above, the forklift having the multi-stage cylindrical mast of the present invention can greatly reduce cost, workability, and safety by preventing the unloading of the mast and reducing the number of parts.

Claims (7)

A pair of multi-stage cylindrical masts 60 assembled in parallel with a plurality of reinforcing bars 64, 65 and 66 while the plurality of cylinders are elastically coupled to each other by hydraulic pressure; A lower frame 61 rotatably coupled to the vehicle body while being fixed to the lowermost cylinder of the mast 60 to be detachably inserted therein; A tilt cylinder 18 installed on the lower frame 61 and the vehicle body so as to be stretchable and supported by the lower frame 61 while being operated by hydraulic pressure to tilt the mast 60; A carriage assembly (15) for loading and lifting cargo while being detachably assembled to the outer circumferential surface of the uppermost cylinder of the mast (60); Multistage type comprising a head cover (69) 70 and a tube assembly (84) for connecting the pipe line to supply the pressure oil discharged from the hydraulic pump of the vehicle to the cylinders to operate them Forklift with cylindrical mast. 2. The multistage cylindrical type according to claim 1, wherein a regulator 83 and a protector 80 for controlling the flow of the hydraulic oil are built in the head covers 69 and 70 provided at the lower portion of the lowermost cylinder 60c. Forklift with mast. The forklift having a multistage cylindrical mast according to claim 1, wherein the tilt cylinder (18) is connected to the vehicle body frame through a tilt cylinder connecting member (62) fixed to the center of the side of the lower frame (61). The forklift having a multistage cylindrical mast according to claim 1, wherein the multistage cylindrical mast (60) is connected to the vehicle body frame through hinge pins (62) fixed to both sides of the lower frame (61). According to claim 2, The head cover (69), 70 guide rods (69a, 70a) protruding to the lower frame 61 is fitted through the fixing member 71, the fixing member 71 ) A plurality of bolt holes 61a and taper holes 71b in a diagonal direction, respectively, and a plurality of bolt holes 61a and taper corresponding to the fixing member 71 on both sides of the lower frame 61. A hole 61b is formed, and an insertion hole 61c corresponding to the guide rods 69a and 70a is formed at the center thereof to fix the fixing member 71 fixed to the head covers 69 and 70 to the lower frame. A forklift having a multistage cylindrical mast, characterized in that it is fixed to (61). The fastening part 76a of claim 1, wherein the carriage fixing holder 75 is fixed to the uppermost cylinder 60a tube up and down, left and right, and the carriage assembly 15 is hooked to the carriage fixing holder 75. Forklift truck having a multi-stage cylindrical mast, characterized in that the carriage blocks (15) are fixed to each other so that the carriage assembly (15) can be assembled through these connection blocks (76) and the carriage fixing holder (75). . The multistage cylinder according to any one of claims 1 to 6, wherein a foldable corrugated tube (67) is installed on the outside of the cylinder except the uppermost cylinder in the multistage cylindrical mast to prevent foreign material from penetrating the rod portion. Forklift with type mast.