CN115744734A - Operation panel of fork truck - Google Patents

Abstract

The invention discloses an operating platform for a forklift, which is characterized in that it comprises: a seat, an adjusting device and two operating handles respectively arranged on both sides of the seat, and the operating handle comprises: a rotating arm having a first hinged part and the second hinge part; the control seat, which has a third hinge part and a fourth hinge part; the first connecting rod, whose one end is hinged with the first hinge part, and the other end is hinged with the third hinge part; the second connecting rod, which One end is hinged to the second hinge, the other end is hinged to the fourth hinge, and the distance from the first hinge to the second hinge is equal to the distance from the third hinge to the fourth hinge. The angle of the control seat of the present invention does not change during the height adjustment process, so that the buttons and knobs on the control seat are always oriented in a direction that is convenient for the operator to control.

Description

A forklift operating platform

technical field

The invention relates to the technical field of forklifts, in particular to an operating platform of a forklift.

Background technique

The operating console of a forklift is generally composed of operating handles, seats and other components, which are used to enable the operator to control the operating handle while sitting on the seat or standing, so as to control various actions of the forklift.

However, there are the following defects in the operating platform of the existing forklift: first, the seat takes up space and causes the operator's legs to be disturbed when standing; Maintain a relatively definite position, but the height adjustment is generally achieved by turning the operating handle, which will cause the direction of the operating handle to change during height adjustment, and cannot be kept at the most suitable angle for the operator to control; third, the two operating handles are respectively in the On both sides of the seat, the distance between the two operating handles cannot be adjusted, making it impossible for some operators to operate the two handles at the same time in a more comfortable posture, which also affects safety.

Contents of the invention

In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a forklift operating platform to solve the problems of inconvenient adjustment of the forklift operating platform in the prior art.

The technical scheme that the present invention adopts to solve its technical problem is a kind of operating platform of forklift, comprising:

Seats, including rotatably attached seats and backs;

Two operating handles are respectively arranged on both sides of the seat, and each operating handle includes: a rotating arm with a first hinged part and a second hinged part; an operating seat with a third hinged part and a fourth hinged part; part; a first connecting rod, one end of which is hinged to the first hinged part, and the other end is hinged to the third hinged part; a second connecting rod, one end of which is hinged to the second hinged part, and the other end is hinged to the said second hinged part The fourth hinge part is hinged, and the distance from the first hinge part to the second hinge part is equal to the distance from the third hinge part to the fourth hinge part;

The adjustment device includes an adjustment rod and two adjustment tubes slidably connected with the adjustment rod, the adjustment rod is arranged under the seat and is rotatably connected with the seat, and each adjustment tube is connected with the One end of the rotating arm away from the control seat is fixedly connected.

Further, the first hinged part, the second hinged part, the third hinged part and the fourth hinged part are respectively at vertices of a parallelogram.

Further, the operating handle has a first state and a second state;

In the first state, the line connecting the first hinge part and the third hinge part is parallel to the horizontal direction, and the line connecting the second hinge part and the fourth hinge part is parallel to the horizontal direction;

In the second state, the line connecting the first hinge part and the third hinge part is parallel to the vertical direction, and the line connecting the second hinge part and the fourth hinge part is parallel to the vertical direction.

Further, it also includes:

A fixed frame, the fixed frame is provided with a first connecting portion and a second connecting portion;

An adjustment frame, the adjustment frame is provided with a third connection part and a fourth connection part, and the adjustment rod is rotatably connected to the adjustment frame;

a third connecting rod, one end of the third connecting rod is hinged to the first connecting part, and the other end is hinged to the third connecting part;

A fourth connecting rod, one end of the fourth connecting rod is hinged to the second connecting part, and the other end is hinged to the fourth connecting part.

Further, the seat has a first surface and a second surface opposite to each other, and the second surface is equipped with an auxiliary backrest; the seat has a third state and a fourth state, and the seat is rotated to freely switch between the third state and the fourth state; wherein, in the third state, the first face of the seat faces up and the second face faces down; in the fourth state, the first face abut against the chair back, and the auxiliary backrest is on the side of the seat away from the chair back;

It also includes a lifting assembly, including a lifting oil cylinder, and the lifting oil cylinder is telescopic to adjust the height of the seat.

Further, it also includes a lifting frame, the lifting frame is detachably connected with the chair back, and the lifting cylinder is connected with the lifting frame;

A connecting plate, the connecting plate has a first fixing part, a rotating part and a second fixing part, the first fixing part is fixed to the seat, and the rotating part is hinged to the seat back;

an extension rod, which is detachably connected to the second fixing part;

A telescopic cylinder, one end of the telescopic cylinder is hinged to the lifting frame, and the other end is hinged to the extension rod.

Furthermore, there is a fifth state between the third state and the fourth state. In the fifth state, the second fixing part is on the same line as the telescopic cylinder, and the third state or the fourth state When switching to the fifth state, the telescopic cylinders are all compressed.

Further, the two ends of the adjustment rod are respectively provided with a connection section, and the connection section is provided with a plurality of adjustment holes along its length direction; each of the adjustment tubes is slidably connected to one of the connection sections, and At least one through hole is opened on the side wall of the regulating tube;

It also includes at least two adjustment screws, each of which is respectively arranged on an adjustment tube, and the adjustment screws pass through the through hole and the adjustment hole at the same time, so as to limit the adjustment of the adjustment tube relative to the adjustment tube. sliding of the rod.

Further, a sleeve is fixedly connected to the outer wall of the regulating pipe, and the sleeve communicates with the through hole;

The adjustment screw is passed through the sleeve, and the adjustment screw slides relative to the sleeve to enter or exit the through hole and the adjustment hole.

Further, the inner wall of the sleeve protrudes inwardly with a first limiting ring and a second limiting ring;

An abutment ring protrudes outward from the outer wall of the adjusting screw, and a spring is sheathed on the adjusting screw, and one end of the spring is in contact with the abutment ring, and the other end is in contact with the first limiting ring. offset;

The adjusting screw has a first position and a second position. In the first position, the abutment ring abuts against the second limiting ring, and the adjusting screw is simultaneously passed through the sleeve, the the through hole and the adjustment hole; in the second position, the abutment ring is separated from the second limiting ring, and the adjustment screw exits the adjustment hole or simultaneously exits the adjustment hole and the through hole hole.

Compared with the prior art, the present invention has at least the following beneficial effects:

(1) A first connecting rod and a second connecting rod are provided, and the two connecting rods are simultaneously hinged to the two ends of the rotating arm and the control seat. When it is necessary to adjust the height of the control seat, the first connecting rod rotates around the first hinge to lift the third hinge; while the first connecting rod rotates, it drives the second connecting rod to rotate around the second hinge. The shaft rotates, so that when the height of the third hinge part changes, the height of the fourth hinge part also changes accordingly, and the relative positions of the third hinge part and the fourth hinge part remain fixed, thus ensuring the correct position of the control seat in the process of being lifted. The angle does not change all the time, so that the buttons and knobs on the control seat are always facing the direction (roughly upward) that is convenient for the operator to manipulate.

(2) An adjustment rod is provided, and an adjustment tube is slidably connected to the connecting section at both ends of the adjustment rod, so that the two handles are respectively connected to the two adjustment tubes, and the adjustment tube can be slid relative to the adjustment rod to adjust the distance between the two handles. The distance between them, so that the two handles are at the appropriate position of the operator's arm at the same time, so that the operator can operate the two handles with both hands at the same time.

(3) In the present application, an auxiliary backrest is added under the seat seat. In the third state, the auxiliary backrest is hidden under the seat seat and does not occupy the leg space; the height of the seat can be adjusted through the expansion and contraction of the lifting oil cylinder, which is easy to operate The personnel observes the goods at a suitable position; in the fourth state, the first surface of the seat is in contact with the back of the seat, the seat is retracted, and the auxiliary backrest faces the operator to prevent it from intruding the standing space of the operator; at the same time, the auxiliary backrest also It can support the operator's back, so that the operator can stand more stably, improve the observation height of the operator, and enhance safety.

Description of drawings

Fig. 1 is the structural representation of console in the embodiment;

Fig. 2 is the structural representation of operating handle in the embodiment;

Fig. 3 is the structural schematic diagram of fixing frame, adjusting frame and operating handle in the embodiment;

Fig. 4 is the structural representation of seat in the embodiment;

Fig. 5 is a schematic structural view of the operating handle and the adjusting device in the embodiment;

Figure 6 is an exploded view of the regulating device in the embodiment;

Fig. 7 is the structural representation of adjusting pipe in the embodiment;

Fig. 8 is a sectional view of the adjusting device in the embodiment;

In the picture:

100. Operating handle; 110. Control seat; 111. Third hinged part; 112. Fourth hinged part; 120. Rotating arm; 121. First hinged part; 122. Second hinged part; 130. First connecting rod; 140, the second connecting rod; 150, the adjustment frame; 160, the fixed frame; 170, the third connecting rod; 180, the fourth connecting rod;

200, seat; 210, chair back; 220, chair seat; 230, auxiliary backrest; 240, connecting plate; 241, extension rod; 250, telescopic cylinder; 260, lifting frame; 270, lifting cylinder;

300, adjusting device; 310, adjusting rod; 311, connecting section; 312, adjusting hole; 320, adjusting tube; 321, sleeve; 321a, first limit ring; 321b, second limit ring;

322, a through hole; 330, an adjusting screw; 331, an abutment ring; 340, a spring.

Detailed ways

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

Please refer to Fig. 1-Fig. 8, the present invention discloses a kind of operating table of forklift, comprising:

The seat 200 includes a rotatably connected seat 220 and a seat back 210;

Two operating handles 100 are respectively arranged on both sides of the seat 200, and each operating handle 100 includes: a rotating arm 120 having a first hinge portion 121 and a second hinge portion 122; an operating seat 110 having a second hinge portion 120; Three hinged parts 111 and the fourth hinged part 112; the first connecting rod 130, one end is hinged with the first hinged part 121, and the other end is hinged with the third hinged part 111; the second connecting rod 140, one end is hinged with the third hinged part 111; The second hinged part 122 is hinged, and the other end is hinged with the fourth hinged part 112, and the distance from the first hinged part 121 to the second hinged part 122 is equal to the distance between the third hinged part 111 and the fourth hinged part 111. The distance of the four hinges 112;

The adjustment device 300 includes an adjustment rod 310 and two adjustment tubes 320 slidably connected with the adjustment rod 310 , the adjustment rod 310 is arranged under the seat 220 and is rotatable with the seat 200 Each adjustment tube 320 is fixedly connected to one end of the rotating arm 120 away from the control seat 110 .

Specifically, referring to FIG. 2 , the present application provides a first connecting rod 130 and a second connecting rod 140 , and the two connecting rods are hinged to both ends of the rotating arm 120 and the control seat 110 at the same time. When the height of the control seat 110 needs to be adjusted, the first connecting rod 130 rotates around the first hinge part 121 to lift the third hinge part 111; while the first connecting rod 130 rotates, it drives the second connecting rod 140 Rotate with the second hinged part 122 as the axis, so that when the height of the third hinged part 111 changes, the height of the fourth hinged part 112 also changes thereupon, because the distance from the first hinged part 121 to the second hinged part 122 is equal to the third The distance from the hinge portion 111 to the fourth hinge portion 112 is such that the angle at which the first link 130/second link 140 rotates relative to the rotating arm 120 is equal to the rotation of the control seat 110 relative to the first link 130/second link 140 , and the direction in which the first link 130/second link 140 rotates relative to the rotating arm 120 is opposite to the direction in which the control seat 110 rotates relative to the first link 130/second link 140, so that the control seat 110 is relatively The angle to the rotating arm 120 remains constant.

Please refer to Fig. 5-Fig. 8, the application is also provided with an adjustment rod 310, and the connecting section 311 at both ends of the adjustment rod 310 is slidably connected with an adjustment tube 320, so that the two handles are respectively connected with the two adjustment tubes 320, and by adjusting The tube 320 slides relative to the adjusting rod 310 to adjust the distance between the two handles, so that the two handles are at the appropriate position on the operator's arm at the same time, so that the operator can operate the two handles with both hands simultaneously.

Further, the first hinged part 121 , the second hinged part 122 , the third hinged part 111 and the fourth hinged part 112 are respectively located at vertices of a parallelogram.

Specifically, the first hinged part 121 , the second hinged part 122 , the third hinged part 111 and the fourth hinged part 112 are located at vertices of a parallelogram, so that the connecting lines between the four hinged parts form a parallelogram. It can be seen that the rotating arm 120, the control seat 110, the first connecting rod 130 and the second connecting rod 140 can form a parallel four-bar linkage structure, and the first connecting rod 130 and the second connecting rod 140 always keep parallel when rotating, ensuring that the control seat The orientation (angle) of 110 does not change during height adjustment, so that the operator can control the buttons and knobs on the control seat 110 even when standing.

Further, please refer to FIGS. 2-3 , the operating handle 100 has a first state and a second state;

In the first state, the connection line between the first hinge part 121 and the third hinge part 111 is parallel to the horizontal direction, and the connection line between the second hinge part 122 and the fourth hinge part 112 is parallel to the horizontal direction;

In the second state, the connection line between the first hinge part 121 and the third hinge part 111 is parallel to the vertical direction, and the connection line between the second hinge part 122 and the fourth hinge part 112 is parallel to the vertical direction. parallel.

In the first state, the connecting line between the first hinged part 121 and the third hinged part 111 is horizontal, and the connecting line between the second hinged part 122 and the fourth hinged part 112 is horizontal. The connecting rod 130 and the second connecting rod 140 (may also include a shell covering the outside of the first connecting rod 130 and the second connecting rod 140) are used as armrests, and the operator's arm can lean on the armrest to control the control seat 110. control.

In the second state, the connecting line between the first hinged part 121 and the third hinged part 111 is vertical, and the connecting line between the second hinged part 122 and the fourth hinged part 112 is vertical. At this moment, the height of the control seat 110 is raised to The highest, it is convenient for the operator to stand and operate.

Further, please refer to Figure 3, which also includes:

A fixed frame 160, the fixed frame 160 is provided with a first connecting portion and a second connecting portion;

An adjustment frame 150, the adjustment frame 150 is provided with a third connection part and a fourth connection part, and the adjustment rod 310 is rotatably connected with the adjustment frame 150;

A third connecting rod 170, one end of the third connecting rod 170 is hinged to the first connecting part, and the other end is hinged to the third connecting part;

A fourth connecting rod 180 , one end of the fourth connecting rod 180 is hinged to the second connecting portion, and the other end is hinged to the fourth connecting portion.

Specifically, the height of the entire operating handle 100 can be adjusted by adjusting the height of the adjusting frame 150 relative to the fixing frame 160 . The two ends of the third connecting rod and the two ends of the fourth connecting rod 180 are respectively at the four end points of a parallelogram, and the third connecting rod 170 and the fourth connecting rod 180 rotate simultaneously to adjust the height of the adjusting frame 150 and make the The orientation of the control seat 110 on the adjustment frame 150 remains unchanged all the time.

Further, referring to FIG. 4 , the seat 220 has a first surface and a second surface opposite to each other, and the second surface is equipped with an auxiliary backrest 230 ; the seat 200 has a third state and a fourth state. state, and turn the seat 220 to switch freely between the third state and the fourth state; wherein, in the third state, the first face of the seat 220 faces upward and the second face faces downward; In the fourth state, the first surface is against the seat back 210 , and the auxiliary backrest 230 is on the side of the seat 220 away from the seat back 210 ;

It also includes a lift assembly, including a lift cylinder 270 , and the lift cylinder 270 is telescopic to adjust the height of the seat 200 .

In the present application, an auxiliary backrest 230 is added under the seat 220. In the third state, the auxiliary backrest 230 is hidden under the seat 220 and does not occupy the leg space; the height of the seat 200 can be adjusted through the expansion and contraction of the lifting cylinder 270 , which is convenient for the operator to observe the goods at a suitable position; in the fourth state, the first surface of the seat 220 is in contact with the seat back 210, the seat 220 is retracted, and the auxiliary backrest 230 faces the operator to prevent it from disturbing the operator's Standing space; at the same time, the auxiliary backrest 230 can also support the operator's back, so that the operator can stand more stably, improve the observation height of the operator, and enhance safety.

Further, please refer to FIG. 4 , it also includes a lifting frame 260 , the lifting frame 260 is detachably connected to the seat back 210 , and the lifting cylinder 270 is connected to the lifting frame 260 ;

A connecting plate 240, the connecting plate 240 has a first fixing part, a rotating part and a second fixing part, the first fixing part is fixed to the seat 220, and the rotating part is hinged to the seat back 210;

an extension rod 241, which is detachably connected to the second fixing part;

A telescopic cylinder 250 , one end of the telescopic cylinder 250 is hinged to the lifting frame 260 , and the other end is hinged to the extension rod 241 .

Furthermore, there is a fifth state between the third state and the fourth state. In the fifth state, the second fixing part is on the same line as the telescopic cylinder 250, and the third state or the fourth state When the state is switched to the fifth state, the telescopic cylinders 250 are all compressed.

Specifically, in the fifth state, the second fixed portion and the telescopic cylinder 250 are in the same straight line, so that the compression amount of the extension rod 241 on the telescopic cylinder 250 reaches the maximum at this time, and the length of the telescopic cylinder 250 is the shortest. maximum.

When switching from the fifth state to the third state or the fourth state, the telescopic cylinder 250 is gradually stretched, but has been in a compressed state. During this process, the telescopic cylinder 250 exerts force on the seat 220, pushing the seat 220 Rotate towards the position of the third state or the fourth state until it abuts against the seat back 210 or the second connecting section 311 . In this way, both the folding and opening of the seat 220 have a suction feeling, which reduces the difficulty of operation.

Simultaneously, because during the 3rd state, the 4th state and the 5th state, telescopic cylinder 250 is in the state of being compressed, makes seat 220 when opening or packing up, telescopic cylinder 250 has a thrust to seat 200, prevents The seat 220 is out of the current state under no external force, so that the seat 200 is more stable when it is stowed or unfolded.

Further, please refer to FIG. 5-FIG. 8, the two ends of the adjustment rod 310 are respectively provided with a connection section 311, and the connection section 311 is provided with a plurality of adjustment holes 312 along its length direction; each of the adjustment tubes 320 are respectively slidably connected to one of the connecting sections 311, and at least one through hole 322 is opened on the side wall of the regulating tube 320;

It also includes at least two adjustment screw rods 330, each of which is arranged on an adjustment tube 320, and the adjustment screw rods 330 pass through the through hole 322 and the adjustment hole 312 at the same time to limit the adjustment The sliding of the tube 320 relative to the rod 310 is adjusted.

Specifically, when it is not adjusted, the adjusting screw 330 is installed in the through hole 322 and the adjusting hole 312 at the same time, and the relative sliding of the adjusting tube 320 relative to the adjusting rod 310 is locked, thereby preventing the two sides from operating the handle 100. Relative displacement between two handles. When it is necessary to adjust the distance between the two handles, you only need to pull out the adjustment screw 330, so that the adjustment screw 330 exits the adjustment hole 312, and the sliding between the adjustment tube 320 and the adjustment rod 310 can be unlocked. Slide the adjustment tube 320 to a proper position, and then extend the adjustment screw 330 into the adjustment hole 312 at the corresponding position to lock.

At the same time, the two handles are adjusted independently, and the adjustment of one handle will not affect the position of the other handle, so that the two handles can be adjusted to an asymmetrical position, thereby meeting more working conditions.

Wherein, the through hole 322 is a hole penetrating through the inner and outer walls of the adjusting pipe 320, and the adjusting hole 312 can be set as a through hole or a blind hole, as long as it can be inserted by the adjusting screw 330 to realize locking.

Further, a sleeve 321 is fixed on the outer wall of the regulating pipe 320, and the sleeve 321 communicates with the through hole 322;

The adjustment screw 330 passes through the sleeve 321 , and the adjustment screw 330 slides relative to the sleeve 321 to enter or exit the through hole 322 and the adjustment hole 312 .

The sleeve 321 is set to constrain and limit the adjusting screw 330 to prevent the adjusting tube 320 from sliding relative to the adjusting rod 310 due to the loosening of the adjusting screw 330 , thereby causing the handle to shake left and right.

Further, the inner wall of the sleeve 321 protrudes inwardly with a first limiting ring 321a and a second limiting ring 321b;

An abutment ring 331 protrudes outward from the outer wall of the adjusting screw 330, and a spring 340 is sheathed on the adjusting screw 330, and one end of the spring 340 is in contact with the abutment ring 331, and the other end is in contact with the abutment ring 331. The above-mentioned first limiting ring 321a offsets;

The adjustment screw 330 has a first position and a second position. In the first position, the abutment ring 331 abuts against the second limit ring 321b, and the adjustment screw 330 is passed through the sleeve at the same time. barrel 321, the through hole 322 and the adjustment hole 312; in the second position, the abutment ring 331 is separated from the second limit ring 321b, and the adjustment screw 330 exits the adjustment hole 312 Or exit the adjustment hole 312 and the through hole 322 at the same time.

Specifically, in the locked state, the spring 340 is in a compressed state, so that the abutment ring 331 is in contact with the second limit ring 321b, thereby preventing the adjustment screw 330 from withdrawing from the adjustment hole 312 under the condition of non-external force, thereby strengthening the lock. stop stability.

When adjustment is required, pull out the adjusting screw 330 outward, continue to compress the spring 340 so that the part of the adjusting screw 330 extending into the adjusting hole 312 exits the adjusting hole 312, and the adjusting tube 320 can slide relative to the adjusting rod 310, and then adjust the handle to In a suitable position, loosen the adjusting screw 330 so that it extends into other corresponding adjusting holes 312 under the elastic force of the spring 340 for locking, which simplifies the step of manually inserting the adjusting screw 330 during adjustment.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, in the present invention, descriptions such as "first", "second", "one" and so on are used for descriptive purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the indicated technical features quantity. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by the present invention.

Claims (10)

1. A forklift operating platform, characterized in that, comprising: Seats, including rotatably attached seats and backs; Two operating handles are respectively arranged on both sides of the seat, and each operating handle includes: a rotating arm with a first hinged part and a second hinged part; an operating seat with a third hinged part and a fourth hinged part; part; a first connecting rod, one end of which is hinged to the first hinged part, and the other end is hinged to the third hinged part; a second connecting rod, one end of which is hinged to the second hinged part, and the other end is hinged to the said second hinged part The fourth hinge part is hinged, and the distance from the first hinge part to the second hinge part is equal to the distance from the third hinge part to the fourth hinge part; The adjustment device includes an adjustment rod and two adjustment tubes slidably connected with the adjustment rod, the adjustment rod is arranged under the seat and is rotatably connected with the seat, and each adjustment tube is connected with the One end of the rotating arm away from the control seat is fixedly connected. 2 . The operating platform of a forklift according to claim 1 , wherein the first hinged part, the second hinged part, the third hinged part and the fourth hinged part are respectively at vertices of a parallelogram. 3. The operating console of a forklift according to claim 1, wherein the operating handle has a first state and a second state; In the first state, the line connecting the first hinge part and the third hinge part is parallel to the horizontal direction, and the line connecting the second hinge part and the fourth hinge part is parallel to the horizontal direction; In the second state, the line connecting the first hinge part and the third hinge part is parallel to the vertical direction, and the line connecting the second hinge part and the fourth hinge part is parallel to the vertical direction. 4. The operating platform of a forklift according to claim 1, further comprising: A fixed frame, the fixed frame is provided with a first connecting portion and a second connecting portion; An adjustment frame, the adjustment frame is provided with a third connection part and a fourth connection part, and the adjustment rod is rotatably connected to the adjustment frame; a third connecting rod, one end of the third connecting rod is hinged to the first connecting part, and the other end is hinged to the third connecting part; A fourth connecting rod, one end of the fourth connecting rod is hinged to the second connecting part, and the other end is hinged to the fourth connecting part. 5. The operating platform of a forklift according to claim 1, wherein the seat has a first surface and a second surface opposite to each other, and the second surface is equipped with an auxiliary backrest; The seat has a third state and a fourth state, and the seat can be switched between the third state and the fourth state by turning the seat; wherein, in the third state, the first face of the seat faces upward and The second face is facing downward; in the fourth state, the first face is against the seat back, and the auxiliary backrest is on a side of the seat far away from the seat back; It also includes a lifting assembly, including a lifting oil cylinder, and the lifting oil cylinder is telescopic to adjust the height of the seat. 6. The operating platform of a forklift according to claim 5, further comprising a lifting frame, the lifting frame is detachably connected to the seat back, and the lifting cylinder is connected to the lifting frame; A connecting plate, the connecting plate has a first fixing part, a rotating part and a second fixing part, the first fixing part is fixed to the seat, and the rotating part is hinged to the seat back; an extension rod, which is detachably connected to the second fixing part; A telescopic cylinder, one end of the telescopic cylinder is hinged to the lifting frame, and the other end is hinged to the extension rod. 7. The operating platform of a forklift according to claim 6, characterized in that, there is a fifth state between the third state and the fourth state, and in the fifth state, the second fixing part and the When the telescopic cylinders are on the same straight line and are switched from the third state or the fourth state to the fifth state, the telescopic cylinders are all compressed. 8. The operating platform of a forklift according to claim 1, wherein the two ends of the adjusting rod are respectively provided with a connecting section, and the connecting section is provided with a plurality of adjusting holes along its length direction; each Each of the adjusting tubes is slidably connected to one of the connecting sections, and at least one through hole is opened on the side wall of the adjusting tube; It also includes at least two adjustment screws, each of which is respectively arranged on an adjustment tube, and the adjustment screws pass through the through hole and the adjustment hole at the same time, so as to limit the adjustment of the adjustment tube relative to the adjustment tube. sliding of the rod. 9. The operating platform of a forklift according to claim 8, wherein a sleeve is fixedly connected to the outer wall of the adjustment pipe, and the sleeve communicates with the through hole; The adjustment screw is passed through the sleeve, and the adjustment screw slides relative to the sleeve to enter or exit the through hole and the adjustment hole. 10. The operating platform of a forklift according to claim 9, characterized in that, the inner wall of the sleeve protrudes inwards with a first stop ring and a second stop ring; An abutment ring protrudes outward from the outer wall of the adjusting screw, and a spring is sheathed on the adjusting screw, and one end of the spring is in contact with the abutment ring, and the other end is in contact with the first limiting ring. offset; The adjusting screw has a first position and a second position. In the first position, the abutment ring abuts against the second limit ring, and the adjusting screw is simultaneously passed through the sleeve, the the through hole and the adjustment hole; in the second position, the abutment ring is separated from the second limit ring, and the adjustment screw exits the adjustment hole or simultaneously exits the adjustment hole and the through hole hole.

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