JP3166710U - Tractor forklift - Google Patents

Abstract

An object of the present invention is to provide a tractor forklift that can be used regardless of whether or not there is an external hydraulic output of the tractor. A tractor forklift (1) that can be connected to a three-point link (91) for connecting working equipment and an auto-hitch (92) provided at the rear of a tractor (90), such as a mounting portion (14) that can be connected to the auto-hitch (92). A lift frame 2 attached thereto, a fork portion 3 having a fork 4 that can move up and down along the lift frame 2, an electric drive portion 5 provided on the lift frame 2 and driving the fork portion 3 to move up and down. An operation unit 30 for operating the operation of the drive unit 5 connected to the drive unit 5 by an electric cable 41 so as to be disposed on the tractor 90, and an operation unit 30 connected to the tractor 90 from the operation unit 30 and a drive unit 5 and a power cable 45 for obtaining the power for operation. [Selection diagram] Fig. 1

Description

  The present invention relates to a tractor forklift that is connected to a link mechanism for connecting work equipment provided at the rear of the tractor.

  At the rear of the tractor, a link mechanism capable of connecting work equipment such as a rotary or ski is provided. The link mechanism moves up and down the connected work equipment. Such a link mechanism is generally a three-point link that supports work equipment at three points, or an auto hitch (coupler) added to the three-point link.

  A forklift that can be connected to such a link mechanism is described in Patent Document 1. In the forklift of Patent Document 1, the forklift itself moves up and down by the operation of the link mechanism of the tractor, and the fork can be moved up and down by the operation of a hydraulic actuator provided in the forklift.

  Although there is no description about the drive circuit of a hydraulic actuator in patent document 1, it is thought that it is connected to the external hydraulic output circuit of a tractor. However, many large tractors can output external hydraulic pressure, but few small tractors can output external hydraulic pressure.

Utility Model Registration No. 2557539

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a tractor forklift that can be used regardless of the presence or absence of an external hydraulic pressure output of the tractor.

  The tractor forklift according to claim 1, which is made to achieve the above object, is a tractor forklift that can be connected to a link mechanism for connecting work equipment provided at a rear portion of the tractor, and the link mechanism. A lift frame with a mounting portion connectable to the lift frame, a fork portion having a fork that can be moved up and down along the lift frame, and an electric motor that is provided on the lift frame and drives the fork portion to move up and down. A drive unit, an operation unit connected to the drive unit with an electric cable so as to be disposed on the tractor, an operation unit for operating the operation of the drive unit, and an operation unit connected to the tractor from the tractor. And a power supply cable for obtaining power for operating the driving unit.

  The forklift for a tractor described in claim 2 is the tractor forklift described in claim 1, wherein the lift frame detects the fork when the fork is raised to a predetermined maximum position, and An upper limit switch for stopping the drive unit, and a lower limit switch for detecting the fork unit and stopping the drive unit when the fork unit is lowered to a predetermined minimum position. Features.

  The forklift for a tractor described in claim 3 is the one described in claim 1 or 2, wherein the electric cable is connectable to the operation unit and / or the drive unit. .

  The forklift for a tractor described in claim 4 is the one described in any one of claims 1 to 3, wherein the power cable is connectable to the operation unit and / or the tractor. And

  The forklift for a tractor described in claim 5 is the one described in any one of claims 1 to 4, so that the fork part rotates the fork upward from the base and follows the lift frame. A foldable folding mechanism is provided.

  The forklift for a tractor described in claim 6 is the forklift according to any one of claims 1 to 5, wherein the drive unit is vertically expanded and the lower part is fixed to the lift frame. Actuator, and a sprocket rotatably attached to the top of the actuator, one end of which is fixed to the lift frame and the other end is fixed to the fork portion. It is characterized in that a chain is suspended.

  The tractor forklift described in claim 7 is the tractor forklift described in any one of claims 1 to 5, and the lift frame can be extended and contracted by sliding the inner column fitted to the outer column. A pair of left and right struts, and a top plate that connects the upper portions of the inner pillars and has a sprocket rotatably attached thereto. One end of the sprocket is fixed to the outer pillar, and the other end A driving chain fixed to the fork part is hung, and the driving part includes an electric actuator having a vertical extension and a lower part fixed to the outer pillar, The upper part of the actuator is fixed to the top plate.

  A tractor forklift according to claim 8 is the tractor forklift according to claim 6 or 7, wherein the actuator is operated by the voltage of the battery of the tractor and the operation of the electric hydraulic pump. It is an electrohydraulic actuator in which a telescopic hydraulic cylinder is integrally formed.

  According to the forklift for a tractor of the present invention, power is supplied from the tractor via a power cable and an electric cable connected to the operation unit, and the electric drive unit operates by this power to raise and lower the forklift. Forklifts can be used with any tractor, with or without external hydraulic output. Furthermore, since the operation part can be arranged on the tractor, the operator can operate the operation of the forklift from above the tractor, which is excellent in operability.

  If the tractor forklift is equipped with an upper limit switch and a lower limit switch, the fork can be reliably stopped at the maximum and minimum positions specified in advance, so that the equipment is not overloaded and the equipment is not overloaded. Can be prevented from being damaged.

  When an electrical cable connecting the operation unit and the drive unit can be connected to the connector, the operation unit and the forklift can be connected and disconnected quickly and easily. Therefore, the operation unit does not get in the way when the tractor and forklift are connected or disconnected. In addition, the forklift can be separated from the tractor while the operation unit is disposed on the tractor.

  Further, when the connector of the power cable connecting the operation unit and the tractor can be connected, the connection and disconnection with the power source of the tractor can be performed quickly and easily.

  Since the fork part has a fork folding mechanism, the area occupied by the forklift is reduced, which is convenient for storing and transporting the forklift.

  Further, by using an electric actuator that expands and contracts in the vertical direction, the fork portion can be raised and lowered electrically. In addition, the top plate that connects the upper and lower parts of the pair of left and right struts is moved up and down with this actuator, and the fork unit is suspended from the sprocket attached to the top plate with the drive chain so that the top plate of the lift frame Move up and down as you go up and down. Therefore, when the forklift is not used, the height of the lift frame can be reduced, which is convenient for storing and transporting the forklift.

  In addition, when the actuator is an electrohydraulic actuator in which an electric hydraulic pump that is operated by the battery voltage of the tractor and a hydraulic cylinder that is expanded and contracted by the operation of the electric hydraulic pump are integrated, the actuator is small, so It can be downsized. In addition, the electrohydraulic actuator has a larger driving force than the actuator that mechanically moves the telescopic rod of the cylinder by rotating the gear, screw shaft, etc. with an electric motor. At the same time, since the driving pressure is large, the adjustment range of the lifting speed can be set large.

It is a perspective view which shows the use condition of the forklift for tractors to which this invention is applied. It is a front view which shows the forklift main body of the forklift for tractors to which this invention is applied. It is AA sectional drawing of FIG. It is an electric block diagram of the forklift for tractors to which the present invention is applied. It is an electric block diagram of the other forklift truck for tractors to which this invention is applied. It is a front view which shows the forklift main body of the other tractor forklift to which this invention is applied. It is BB sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described in detail, but the scope of the present invention is not limited to these embodiments.

  FIG. 1 illustrates a state in which a tractor forklift 1 according to the present invention is connected to a rear portion of a tractor 90.

  The rear part of the tractor 90 is provided with a three-point link 91 including a pair of lower links 91a on the left and right and a top link 91b located at the middle upper part. An auto hitch 92 is connected to the three-point link 91 so that work equipment can be easily connected as necessary. Various types of the three-point link 91 and the auto hitch 92 are defined by the JIS standard and the Japan Agricultural Machinery Manufacturers Association standard (Nichinoko standard). The tractor forklift 1 of the present invention is used by being connected to such a link mechanism for connecting work equipment such as the three-point link 91 and the auto hitch 92. Hereinafter, the tractor forklift 1 connected to the auto hitch 92 will be described as an example.

  As shown in the figure, the tractor forklift 1 includes a lift frame 2, a fork unit 3, a drive unit 5, an operation unit 30, an electric cable 41, and a power cable 45.

  FIG. 2 is a partially cutaway front view of the forklift body of the tractor forklift 1, and FIG. As shown in FIGS. 2 and 3, the lift frame 2 is a square frame formed by standing a pair of left and right columns 12 from both ends of the bottom plate 11 and connecting the upper portions of the columns 12 with a top plate 13. The lift frame 2 is provided with attachment portions 14, 14, 15 on the back side thereof so as to be connectable to the auto hitch 92. The attachment portion 14 is attached to the lower portion of each of the both columns 12. The attachment portion 15 is attached to a plate extending between the columns 12 and 12 at a position higher than the attachment portion 14 and between the columns 12 and 12. As an example, the support column 12 is formed in a column shape by bending an iron plate into a substantially U shape, and is erected in a direction in which the U shape opens toward the inside of the lift frame 2.

  Along the lift frame 2, the fork portion 3 can be raised and lowered. The fork unit 3 includes a pair of forks 4 and a fork support frame 17. The fork support frame 17 is formed in a size that fits within the frame of the lift frame 2, and rollers 18, 18. The roller 18 is fitted in a U-shaped groove of the support column 12, and the fork support frame 17 smoothly moves up and down in the frame of the lift frame 2 as the roller 18 rotates and moves in the groove. On the front side of the fork support frame 17, the fork 4 is fixed in position by welding or bolts. The interval between the forks 4 and 4 may be variable. An electric drive unit 5 is connected to the fork unit 3.

  The drive unit 5 is provided on the lift frame 2 and includes an electrohydraulic actuator 6, a sprocket 8, and a drive chain 9. The electro-hydraulic actuator 6 is an example of an electric actuator according to the present invention. The electro-hydraulic actuator 7 is capable of generating high-pressure oil pressure with a tractor battery voltage (for example, DC 12V), and the electro-hydraulic pump 7a is operated to expand and contract. The double-acting hydraulic cylinder 7b is integrally configured and is also called a unit-integrated hydraulic cylinder. Specifically, in the hydraulic cylinder 7b, the telescopic rod 21 is fitted to the main body of the cylindrical hydraulic cylinder 7b. The electrohydraulic actuator 6 electrically controls the electric hydraulic pump 7a to extend or contract the telescopic rod 21 from the main body of the hydraulic cylinder 7b with the forward or reverse hydraulic pressure generated by the electric hydraulic pump 7a. Can be controlled. Various known electrohydraulic actuators 6 can be used. In the electrohydraulic actuator 6, the lower portion of the hydraulic cylinder 7 b main body is fixed to a substantially central portion of the bottom plate 11 so that the hydraulic cylinder 7 b stands upright with respect to the bottom plate 11. A pair of sprockets 8 is rotatably attached to the upper portion of the hydraulic cylinder 7b, that is, the upper portion of the telescopic rod 21 so as to sandwich the telescopic rod 21 therebetween.

  On each sprocket 8, a driving chain 9 having one end fixed to the lift frame 2 by a fixing member 23 and the other end fixed to the fork portion 3 by a fixing member 24 is suspended. When the electrohydraulic actuator 6 (hydraulic cylinder 7b) extends, the sprocket 8 moves upward, and the fork portion 3 suspended by the drive chain 9 moves upward. An upper limit switch 27 for detecting the fork unit 3 and stopping power supply to the drive unit 5 when the fork unit 3 is raised to the highest position defined in advance is arranged on the upper part of the support column 2. . In addition, a lower limit switch 28 for detecting the fork unit 3 and stopping the power supply to the drive unit 5 when the fork unit 3 is lowered to a predetermined minimum position is disposed at the lower part of the support column 2. ing.

  Referring back to FIG. 1, the operation unit 30 is connected to the drive unit 5 by an electric cable 41 having a length that reaches the tractor 90 sufficiently so as to be disposed on the tractor 90. The operation unit 30 is operated by an operator to operate the operation of the drive unit 5, that is, the raising and lowering of the fork unit 3 (fork 4). The operation unit 30 is connected to the tractor 90 by a power cable 45. The power cable 45 is for obtaining from the power tractor 90 for operation of the drive unit 5.

  FIG. 4 shows an example of an electric block diagram in a state where the tractor forklift 1 and the tractor 90 are connected.

  A connector 97 is electrically connected to the battery 96 of the tractor 90. This connector 97 may be an external power output connector that is an equipment of the tractor 90 or may be a connector newly provided in the tractor 90 in order to use the tractor forklift 1. The battery 96 and the connector 97 may be connected via a main switch (not shown) of the tractor 90.

  A connector 46 on one end side of the power cable 45 is detachably connected to the connector 97. The connector 47 on the other end side of the power cable 45 is detachably connected to the connector 31 of the operation unit 30.

  The operation unit 30 includes a connector 31, a drive control unit 32, an operation button 33, and a connector 34. A drive control unit 32 is connected to the connector 31. An operation button 33 and a connector 34 are connected to the drive control unit 32. The operation button 33 is for selecting and operating the fork 4 (see FIG. 1) to be raised or lowered. Moreover, you may enable it to select the raising / lowering speed as needed. The drive control unit 32 outputs an electrical signal to the connector 34 (electric hydraulic pump 7a) so that the telescopic rod 21 extends or contracts from the main body of the hydraulic cylinder 7b based on the raising or lowering operation of the operation button 33. Further, when the operation button 33 for speed selection is operated, the drive control unit 32 outputs an electrical signal subjected to, for example, pulse width modulation (PWM) control or voltage control so as to correspond to the selected speed. 34.

  Further, an upper limit switch 27 and a lower limit switch 28 provided in the drive unit 5 are connected to the drive control unit 32 via a connector 34. The limit switches 27 and 28 are always in an off state as an example, and are make contact type switches that are in an on state when the detection target fork unit 3 comes into contact with a detector such as a lever or a button. When the upper limit switch 27 or the lower limit switch 28 is turned on, the drive control unit 32 stops outputting the electric signal (electric power) to the connector 34 (electric hydraulic pump 7a).

  A connector 42 on one end side of the electric cable 41 is detachably connected to the connector 34. Further, the connector 48 of the drive unit 5 is detachably connected to the connector 43 on the other end side of the electric cable 41. In the drive unit 5, an upper limit switch 27, a lower limit switch 28, and an electric hydraulic pump 7 a are connected to a connector 48.

  The connectors 31, 34, 42, 43, 46, 47, 48 and 97 are all preferably waterproof connectors.

  The tractor forklift 1 is used as follows.

  First, the lift frame 2 of the tractor forklift 1 is connected to the tractor 90 as shown in FIG. At this time, since the attachment portion 14 and the attachment portion 15 (see FIGS. 2 and 3) are attached to the lift frame 2 so as to fit the auto hitch 92 of the tractor 90, they can be easily connected.

  Further, the operation unit 30 is arranged at an arbitrary position of the tractor 90. The operation unit 30 may be fixed to the tractor 90 with a fixing tool such as a bolt or a belt, or may be arranged to be held by the operator. The operation unit 30 and the drive unit 5 are connected by the electric cable 41, and the operation unit 30 and the battery 96 of the tractor 90 are connected by the power cable 45. Thus, since the electric cable 41 and the power cable 45 can be connected to the connector, it does not get in the way when the lift frame 2 is connected to the tractor 90, and the cable can be connected quickly and easily.

  When the operator operates the operation button 33 of the operation unit 30, the drive control unit 32 operates the electric hydraulic pump 7a, the telescopic rod 21 of the hydraulic cylinder 7b expands and contracts, and the fork unit 3, that is, the fork 4 moves up and down. . A state in which the fork 4 is raised is indicated by a two-dot chain line in FIGS. This is convenient because the operator can operate the operation unit 30 while riding the tractor 90.

  By operating the operation button 32, the fork unit 3 is raised, and when the upper end of the fork unit 3 indicated by a two-dot chain line in FIG. 2 hits the upper limit switch 27, the upper limit switch 27 is turned on. Thereby, the drive control part 32 stops the electric hydraulic pump 7a immediately, and stops the movement of the expansion-contraction rod 21. FIG. As a result, the fork unit 3 stops at the highest value defined in advance. Further, when the fork unit 3 is lowered by the operation of the operation button 32 and the lower end of the fork unit 3 indicated by a solid line in FIG. 2 hits the lower limit switch 28, the lower limit switch 28 is turned on. Thereby, the drive control part 32 stops the electric hydraulic pump 7a immediately, and stops the movement of the expansion-contraction rod 21. FIG. Thereby, the fork part 3 stops in the lowest position prescribed | regulated previously. Thereby, since the fork part 3 does not hit the lift frame 2, an overload is not applied and damage to the tractor forklift 1 is prevented.

  The tractor forklift 1 can be moved up and down or inclined as a whole by moving the three-point link 91 of the tractor 90 up and down.

  When the forklift main body is separated from the tractor 90, the electric cable 41 is detached from the drive unit 5 and the operation unit 30, so that the forklift main body can be separated with the operation unit 30 being placed on the tractor 90. If the operation unit 30 is left on the tractor 90, the next time the tractor forklift 1 is used, the forklift main body is connected to the tractor 90, and the operation unit 30 is connected with the electric cable 41, The operation unit 30 can be used immediately without being fixed to the tractor 90 again.

Note that it is preferable to provide the connectors 42 and 43 at both ends of the electric cable 41 because connection and disconnection with the tractor 90 are simple, but only one of the connectors 42 and 43 is provided on the electric cable 41. The other end of 41 may be directly connected (drawn) to the operation unit 30 or the drive unit 5. Similarly, it is preferable to provide the connectors 46 and 47 at both ends of the power cable 45, but only one of the connectors 46 and 47 is provided on the power cable 45, and the other end side of the power cable 45 is connected to the operation unit 30 or the tractor 90. You may connect directly to.
Although connection and disconnection with the tractor 90 are somewhat inconvenient, the electric cable 41 may be directly connected without the connectors 42 and 43, or the power cable 45 may not be provided with the connectors 46 and 47. You may make it connect directly.

  In the above description, the example in which the drive control unit 32 is disposed on the operation unit 30 side as illustrated in FIG. 4 has been described. However, the drive control unit 32 may be disposed on the drive unit 5 side as illustrated in FIG. . In the following, the same components as those already described are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the tractor forklift 1a shown in FIG. 5, since the drive control unit 32 is disposed on the drive unit 5a side, the electrical cable 41a, the connector 42a of the electrical cable 41a, and the connector 42a of the electrical cable 41a are connected to connect the drive unit 5a and the operation unit 30a. 43a, the connector 48a of the drive unit 5a, and the connector 34a of the operation unit 30a are different from the tractor forklift 1. As an example, the drive control unit 32 is accommodated and disposed in a waterproof box near the electric hydraulic pump 7a, on the side surface of the support column 12, or the like. Even with such a configuration, the tractor forklift 1 a can be used in the same manner as the tractor forklift 1.

  Moreover, it is good also considering what the forklift main body shown in FIGS. 1-3 is shown to FIG. FIG. 6 is a partially cutaway front view of the forklift main body of the tractor forklift 1b, and FIG.

  The forklift body of the tractor forklift 1b shown in FIGS. 6 and 7 includes a lift frame 2b, two struts 12b whose inner pillars 52 fitted to the outer pillars 51 slide and extend in length, The upper part of the column 52 is connected, and the top plate 13b to which the sprocket 8b is rotatably attached is provided. The sprocket 8b is suspended with a driving chain 9 having one end fixed to the outer column 51 by a fixing member 23b and the other end fixed to the fork portion 3b by a fixing member 24b. In the drive unit 5b, the upper part of the electrohydraulic actuator 6 (upper part of the telescopic rod 21) that expands and contracts in the vertical direction by operation of the electric hydraulic pump 7a is fixed to the top plate 13b. The lower part of the electrohydraulic actuator 6 (hydraulic cylinder 7 b) is fixed to the outer column 51. In FIG. 6, the drive chain 9 is not shown.

  If it demonstrates concretely, as for the outer pillar 51 and the inner pillar 52 of the lift frame 2b, as for an example, each cross section is formed in the substantially H character type. Inside the outer pillar 51, the inner pillar 52 is arranged in a positional relationship in which the grooves of each cross-section H are staggered. A roller 59 is attached to the inner column 52, and this roller 59 is fitted in the H-shaped groove of the outer column 51. As the roller 59 rotates, the outer column 51 and the inner column 52 slide smoothly with each other. The lower sides of the outer columns 51 and 51 are connected by the bottom plate 11b, and the upper sides of the inner columns 52 and 52 are connected by the top plate 13b. The fork portion 3b is provided with rollers 18b that fit into the H-shaped groove of the inner column 52 on the upper and lower sides of both sides of the fork support frame 17b, and smoothly along the H-shaped groove of the inner column 52. Go up and down.

  The drive unit 5b includes an electrohydraulic actuator 6, a sprocket 8b, and a drive chain 9. The lower part of the electrohydraulic actuator 6 (hydraulic cylinder 7b) is fixed to the center of the bottom plate 11b. The sprocket 8b is sandwiched between a pair of plate-like support members 54 and is rotatably fixed to the lower surface side of the top plate 13b. The upper part of the telescopic rod 21 of the electrohydraulic actuator 6 is fixed to the lower side of the support member 54. The fork unit 3 is suspended by a drive chain 9 suspended from the sprocket 8b.

  In this tractor forklift 1b, when the electric hydraulic pump 7a is operated and the telescopic rod 21 extends upward, the top plate 13b is pushed upward by the telescopic rod 21. As a result, the sprocket 8b moves upward, and the fork portion 3b suspended by the drive chain 9 rises, that is, the fork 4b rises as shown by a two-dot chain line in FIG.

  In this way, the fork 4b rises as the top plate 13b rises. Moreover, the fork 4b descends as the top plate 13b descends. Therefore, the tractor forklift 1b can be reduced in size in the height direction as compared with the tractor forklift 1 described above with the fork 4b lowered, and the tractor forklift 1b becomes compact as a whole.

  Further, the tractor forklift 1b includes a folding mechanism 60 in which the fork portion 3b can be folded along the lift frame 2b by rotating the fork 4b upward from the base. The folding mechanism 60 may be realized by including a rotation shaft 61 that passes through the base of the fork 4 and is fixed to the fork portion 3, or may employ another known mechanism. By folding the fork 4b as shown by a two-dot chain line arrow in FIG. 7, the exclusive area of the tractor forklift 1b can be reduced when not in use. Such a fork portion 3b may be provided in the tractor forklift 1.

  Although the electrohydraulic actuator 6 has been described as an example in which the electrohydraulic pump 7a and the hydraulic cylinder 7b are integrally formed, the required space and shape are increased, but separate types are arranged. Also good. Further, the electrohydraulic actuator 6 may be replaced with an electric actuator that mechanically expands and contracts the telescopic rod by rotating the electric motor without using hydraulic pressure. In such an electric actuator, for example, a female screw is formed on the inner wall of a cylindrical cylinder body, a screw shaft formed with a male screw is screwed into the female screw, and the screw shaft is rotated by the rotation of an electric motor via a gear. By rotating / reversely rotating, the screw shaft is linearly reciprocated relative to the cylinder body, and the telescopic rod connected to the screw shaft is linearly reciprocated. As the electric actuator, not only those having such a configuration but also various known ones can be used.

  1 · 1a · 1b is a tractor forklift, 2 · 2b is a lift frame, 3 · 3b is a fork part, 4 · 4b is a fork, 5 · 5a · 5b is a drive part, 6 is an electrohydraulic actuator, 7a is an electric hydraulic pump , 7b are hydraulic cylinders, 8 and 8b are sprockets, 9 is a drive chain, 10 is 11 and 11b is a bottom plate, 12 and 12b are support columns, 13 and 13b are top plates, 14 and 15 are mounting parts, and 17 and 17b Is a fork support frame, 18 and 18b are rollers, 21 is a telescopic rod, 23, 23b, 24, and 24b are fixing members, 27 is an upper limit switch, 28 is a lower limit switch, 30 and 30a are operating units, and 31, 34, and 34a is a connector, 32 is a drive control unit, 33 is an operation button, 41 and 41a are electric cables, 42, 42a, 43 and 43a are connectors, and 45 is a power cable. , 46 and 47 are connectors, 48 and 48a are connectors, 51 is an outer column, 52 is an inner column, 54 is a support member, 59 is a roller, 60 is a folding mechanism, 61 is a rotating shaft, 90 is a tractor, 91 is Three-point link, 91a is a lower link, 91b is a top link, 92 is an auto hitch, 96 is a battery, 97 is a connector, and A and B are sectional lines.

Claims (8)

A forklift for a tractor that can be connected to a link mechanism for connecting work equipment provided at the rear of the tractor,
A lift frame with a mounting portion connectable to the link mechanism;
A fork portion having a fork that is movable up and down along the lift frame;
An electric drive unit provided on the lift frame for driving the fork unit up and down;
An operation unit connected to the drive unit by an electric cable so as to be disposed on the tractor, and for operating the operation of the drive unit;
A tractor forklift, comprising: a power cable connected to the tractor from the operation unit to obtain electric power for operation of the drive unit from the tractor.   An upper limit switch for detecting the fork portion and stopping the driving portion when the fork portion is raised to a predetermined maximum position, and the fork portion at a predetermined minimum position. The forklift for a tractor according to claim 1, further comprising a lower limit switch for detecting the fork portion and stopping the driving portion when the fork is lowered.   The forklift for a tractor according to claim 1 or 2, wherein the electric cable is connectable to the operation unit and / or the drive unit by a connector.   The tractor forklift according to any one of claims 1 to 3, wherein the power cable is connectable to the operation unit and / or the tractor.   The forklift for a tractor according to any one of claims 1 to 4, wherein the fork part includes a folding mechanism that rotates the fork upward from a base and can be folded along the lift frame.   The drive unit includes an electric actuator that expands and contracts in the vertical direction and a lower part is fixed to the lift frame, and a sprocket that is rotatably attached to the upper part of the actuator. A forklift for a tractor according to any one of claims 1 to 5, wherein a drive chain is fixed to the lift frame and the other end is fixed to the fork portion. . The lift frame connects a pair of left and right struts whose length can be expanded and contracted by sliding the inner pillar fitted to the outer pillar, and the top of each of the inner pillars. A drive chain having one end fixed to the outer column and the other end fixed to the fork portion is hung on the sprocket.
The drive unit includes an electric actuator that expands and contracts in the vertical direction and a lower part is fixed to the outer column, and an upper part of the actuator is fixed to the top plate. The tractor forklift according to any one of claims 1 to 5.   7. The electrohydraulic actuator, wherein the actuator is an electrohydraulic actuator integrally configured with an electric hydraulic pump operable by the voltage of the battery of the tractor and a hydraulic cylinder that expands and contracts by the operation of the electric hydraulic pump. Or the forklift for tractors as described in 7.

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