CN219259920U - Furnace cover grabbing structure - Google Patents

Abstract

The utility model discloses a furnace grabbing cover structure, relates to the technical field of coke oven machinery in the coking industry, and particularly relates to a furnace grabbing cover mechanism of a smoke guide vehicle. The utility model comprises the following steps: the clamping jaw lifting cylinder, the fixing frame, the upper connecting nut, the clamping jaw opening and closing device and the clamping jaw; the fixing frame is fixedly arranged on a vehicle body platform of the smoke guide vehicle, and a through hole for a claw lifting oil cylinder piston rod to pass through is arranged in the middle of the fixing frame; the cylinder barrel of the claw lifting cylinder is fixed on the top end surface of the fixed frame, a piston rod of the claw lifting cylinder passes through a through hole on the fixed frame and then is connected with the top of the claw opening and closing device through an upper connecting nut, and the claw lifting cylinder piston rod stretches to drive the claw opening and closing device, the claw and the like to vertically move in a series to be lifted integrally; the claw is arranged at the bottom of the claw opening and closing device, and the claw is used for grabbing/putting down the furnace cover under the action of the claw opening and closing device. According to the technical scheme, the problems that a limit switch cannot be installed on a claw opening and closing cylinder or the driving of a plurality of claw opening and closing cylinders is asynchronous in the prior art are solved.

Description

Furnace cover grabbing structure

Technical Field

The utility model discloses a furnace grabbing cover structure, relates to the technical field of coke oven machinery in the coking industry, and particularly relates to a furnace grabbing cover mechanism of a smoke guide vehicle.

Background

As one of the important coke oven machines, a smoke guide car runs on a roof rail for guiding smoke dust in a coking chamber being pushed to an adjacent coking chamber at the end of coking. In the smoke guiding operation flow of the smoke guiding vehicle, the furnace cover is required to be opened and closed by a furnace cover grabbing mechanism. The existing furnace grabbing cover mechanism mainly comprises: the single claw opening and closing oil cylinder is coaxially arranged relative to the claw lifting oil cylinder and drives the claw to open and close, a cylinder barrel of the single claw opening and closing oil cylinder is fixed, and a piston rod of the single claw opening and closing oil cylinder moves. The existing form has the following main disadvantages:

1. the limit switch is unconditionally installed because the moving part is closed. The electric control system cannot accurately judge the opening/closing state of the clamping jaw, so that operators easily produce artificial misjudgment to cause operation safety accidents;

2. in the opening process of the clamping jaw, the clamping jaw rotates around the hinge point, and the hinge point of the clamping jaw is gradually close to the furnace cover, so that the clamping jaw is easy to interfere with the furnace cover;

3. the jack catch opening and closing cylinder, in the course of reciprocating motion, the piston area of action is unequal, make jack catch open and close the force difference great, the cylinder has no rod cavity piston area of action great, the mechanical impact is great;

the other mode of the existing furnace grabbing cover mechanism is as follows: the two claw opening and closing cylinders are symmetrically arranged relative to the claw lifting cylinder and drive the claws to open and close, the piston rods of the two claw opening and closing cylinders are fixed, and the cylinder barrel moves. In this form, the following main drawbacks remain:

4. the jaw opening and closing actions are driven by double cylinders in a non-coaxial way, and the phenomena of unbalanced load holding force, jaw tail end shaking and the like are possibly caused by the fact that two oil cylinders are not synchronous;

aiming at the problems in the prior art, a novel furnace grabbing cover structure is researched and designed, so that the problems in the prior art are overcome.

Disclosure of Invention

The claw-opening and closing oil cylinder provided according to the prior art can not be provided with a limit switch or is driven by a plurality of oil cylinders to be asynchronous, so that the furnace-cover grabbing mechanism is provided. The utility model mainly utilizes the double-piston rod type claw opening and closing oil cylinder, is coaxially arranged with the claw lifting oil cylinder, and realizes the opening and closing actions of the claw through the movement of the cylinder barrel of the claw opening and closing oil cylinder. And a limit switch is arranged to control the opening and closing travel of the claw, and the opening and closing state of the claw is sensed, so that the claw is accurately controlled to be opened and closed, and the furnace cover is reliably grabbed.

The utility model adopts the following technical means:

a grab furnace cover structure comprising: the clamping jaw lifting cylinder, the fixing frame, the upper connecting nut, the clamping jaw opening and closing device and the clamping jaw;

further, the fixing frame is fixedly arranged on a vehicle body platform of the smoke guide vehicle, and a through hole for a claw lifting oil cylinder piston rod to pass through is arranged in the middle of the fixing frame;

further, a cylinder barrel of the claw lifting cylinder is fixed on the top end face of the fixed frame, a piston rod of the claw lifting cylinder passes through a through hole in the fixed frame and then is connected with the top of the claw opening and closing device through an upper connecting nut, and the claw lifting cylinder piston rod stretches to drive the claw opening and closing device, the claw and the like to vertically move in a series to be lifted integrally;

further, the claw is arranged at the bottom of the claw opening and closing device, and the claw is used for grabbing/putting down the furnace cover under the action of the claw opening and closing device.

Further, the jaw opening/closing device includes: the clamping jaw opening and closing cylinder, a lower connecting nut, a guide sliding sleeve, a lifting cross beam, an extension tube, an extension rod, a clamp hinge lug, a pull rod and a rod head hinge lug;

further, the middle part of the lifting cross beam is provided with an upper through hole and a lower through hole, and a guide sliding sleeve is arranged in the holes;

further, the lower end of the cylinder barrel of the claw opening and closing cylinder is coaxially connected with the extension barrel;

further, the extension cylinder penetrates through an inner hole of the guide sliding sleeve, and two clamp hinge lugs are symmetrically assembled at the lower end of the extension cylinder;

further, a piston rod of the claw opening and closing cylinder is connected with the top end of the extension rod through a lower connecting nut;

further, the extension rod is inserted into the extension cylinder, the lower end of the extension rod penetrates out of the bottom end of the extension cylinder, and the claw is assembled through the rod head hinge lug;

further, the middle positions of the upper parts of the two ends of the clamping jaw are hinged with the bottom end of the pull rod, and the top end of the pull rod is hinged with the clamp hinge lug.

Further, the lower end face of the lifting cross beam is provided with a smoke guide tube and is coaxially assembled with the extension tube;

further, the bottom end of the extension cylinder is provided with a cylinder wall cleaner; the cylinder wall cleaner is formed by buckling two semicircular shapes together, coaxially arranged in a clamping groove on the outer wall of the extension shaft, uniformly distributed with a plurality of brushes formed by short steel wire ropes in staggered layers along the radial direction, and scraping the inner wall of the smoke guide cylinder up and down.

Further, the inner hole of the guide sliding sleeve is provided with a plurality of annular grooves, graphite packing is filled in the grooves, and the graphite packing is in dynamic seal with the outer cylinder of the extension cylinder to prevent smoke dust from overflowing.

Further, a guide through hole is arranged on the fixing frame, a guide sliding rod is arranged in the fixing frame, and the bottom end of the guide sliding rod is connected with the lifting cross beam; the guide slide bar is arranged in parallel with the piston rod of the claw lifting cylinder.

Further, the below of mount sets up jack catch lift and detects, includes: the device comprises two limit switches A, a suspender A and an induction iron block A;

further, two limit switches A are arranged at the lower part of the fixing frame through a hanger rod hanger A and are aligned with the upper limit position and the lower limit position of the claw lifting oil cylinder respectively;

further, the induction iron block A is arranged on the connecting nut, one end of the induction iron block A is close to the A with the limit switch, the other end of the induction iron block A is sleeved on the guide slide rod, and the induction iron block A is driven by the claw lifting oil cylinder to do lifting motion along the guide slide rod.

Further, the below of mount sets up the jack catch switching and detects, includes: the two limit switches B, the suspender B and the induction iron block B;

further, the two limit switches B are hoisted at the lower part of the fixing frame through the suspender B and are aligned with the upper limit position and the lower limit position of the claw switch oil cylinder respectively;

further, the induction iron block B is arranged at the lower part of the claw opening and closing cylinder, one end of the induction iron block B is close to the limit switch B, the other end of the induction iron block B is sleeved on the guide slide rod, and the induction iron block B is driven by the claw lifting cylinder to do lifting motion along the guide slide rod.

Compared with the prior art, the utility model has the following advantages:

1. according to the furnace grabbing cover structure, the claw opening and closing actions are realized by fixing the piston rod of the claw opening and closing oil cylinder and moving the cylinder barrel relative to the piston rod, and the limit switch is conditionally installed because the moving part is not closed; the limit switch not only can be used for adjusting the actual stroke of the oil cylinder, but also can feed back the real-time state information of the oil cylinder to the electric control system, so that the opening/closing state of the claw is judged, and the operation safety accident caused by human misjudgment of an operator is avoided;

2. according to the furnace cover grabbing structure, the claw rotates around the fixed hinge point in the opening process of the claw and gradually moves away from the furnace cover, so that the claw and the furnace cover are easy to debug in a state of no interference;

3. according to the furnace grabbing cover structure provided by the utility model, the piston action areas of the claw opening and closing oil cylinders are equal in the reciprocating action process, so that the claw opening and closing forces are almost constant, the action is stable, and the mechanical impact is small;

4. the claw opening and closing actions of the furnace grabbing cover mechanism provided by the utility model are driven coaxially by a single cylinder, so that the phenomena of unbalanced load holding, claw tail end shaking and the like caused by asynchronous multi-cylinder are avoided;

5. the furnace grabbing cover mechanism provided by the utility model has a simple structure, most of moving components are exposed, and the furnace grabbing cover mechanism is easy to overhaul.

In conclusion, by applying the technical scheme of the utility model, the problems that a limit switch cannot be installed on a claw opening and closing cylinder or the driving of a plurality of claw opening and closing cylinders is asynchronous in the prior art are solved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required for the description of the embodiments or the prior art will be briefly described below

The drawings in the following description are illustrative of certain embodiments of the utility model and other drawings may be made from these drawings by those of ordinary skill in the art without inventive faculty.

FIG. 1 is a schematic diagram of the open claw working condition of the present utility model;

FIG. 2 is a schematic diagram of the present utility model in the closed-claw condition;

FIG. 3 is a schematic diagram of the smoke guiding operation of the present utility model.

In the figure: 1. claw lifting cylinder 2, guide slide rod 3, fixing frame 4 and claw lifting detection

41. Limit switch A42, suspender A43, induction iron block A5, claw opening and closing detection 51, limit switch B52, suspender B53, induction iron block B6, upper connecting nut 7 and claw opening and closing oil cylinder

8. The lower connecting nut 9, the guiding sliding sleeve 10, the graphite packing 11, the lifting beam 12, the smoke guide tube 13, the extension tube 14, the extension rod 15, the tube wall sweeper 16, the clamp hinge 17, the pull rod 18, the rod head hinge 19, the clamping jaw 20 and the furnace cover.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

As shown in the figure, the utility model provides a furnace grabbing cover structure, which comprises: the claw lifting cylinder 1, the fixing frame 3, the upper connecting nut 6, the claw opening and closing device and the claw 19; the fixing frame 3 is fixedly arranged on a vehicle body platform of the smoke guide vehicle, and a through hole for a piston rod of the claw lifting cylinder 1 to pass through is arranged in the middle of the fixing frame; the cylinder barrel of the claw lifting cylinder 1 is fixed on the top end surface of the fixed frame 3, a piston rod of the claw lifting cylinder 1 passes through a through hole on the fixed frame 3 and then is connected with the top of the claw opening and closing device through an upper connecting nut 6, and the expansion and contraction of the piston rod of the claw lifting cylinder 1 drives the claw opening and closing device, the claw 19 and the like to vertically move in a series, so that the whole body moves in a lifting manner; the claw 19 is provided at the bottom of the claw opening/closing device, and grips/lowers the lid 20 by the claw opening/closing device.

The claw opening/closing device includes: the clamping jaw opening and closing cylinder 7, the lower connecting nut 8, the guide sliding sleeve 9, the lifting beam 11, the extension cylinder 13, the extension rod 14, the clamping hoop hinge lug 16, the pull rod 17 and the rod head hinge lug 18; the middle part of the lifting beam 11 is provided with an upper through hole and a lower through hole, and a guide sliding sleeve 9 is arranged in the holes; the lower end of the cylinder barrel of the claw opening and closing cylinder 7 is coaxially connected with the extension barrel 13; the extension cylinder 13 passes through the inner hole of the guide sliding sleeve 9, and two clamp hinge lugs 16 are symmetrically assembled at the lower end; the piston rod of the claw opening and closing cylinder 7 is connected with the top end of the extension rod 14 through the lower connecting nut 8; the extension rod 14 is inserted into the extension cylinder 13, the lower end of the extension rod penetrates out of the bottom end of the extension cylinder 13, and the clamping jaw 19 is assembled through the rod head hinge lug 18; the upper middle positions of the two ends of the clamping claw 19 are hinged with the bottom end of the pull rod 17, and the top end of the pull rod 17 is hinged with the clamp hinge lug 16.

The lower end surface of the lifting beam 11 is provided with a smoke guide tube 12 and is coaxially assembled with an extension tube 13; the bottom end of the extension cylinder 13 is provided with a cylinder wall cleaner 15; the cylinder wall cleaner 15 is formed by buckling two semicircular shapes together, is coaxially arranged in a clamping groove on the outer wall of the extension shaft 13, and is uniformly distributed with a plurality of brushes consisting of short steel wire ropes in staggered layers along the radial direction, and scrapes up and down on the inner wall of the smoke guide cylinder 12.

The inner hole of the guiding sliding sleeve 9 is provided with a plurality of annular grooves, graphite packing 10 is filled in the grooves, and the graphite packing 10 is in dynamic seal with the outer cylinder of the extension cylinder 13 to prevent smoke dust from overflowing.

The fixing frame 3 is provided with a guide through hole, a guide slide bar 2 is arranged in the guide through hole, and the bottom end of the guide slide bar 2 is connected with a lifting cross beam 11; the guide slide bar 2 is arranged in parallel with the piston rod of the claw lifting cylinder 1. The piston rod is prevented from rotating relative to the cylinder barrel.

The below of mount 3 sets up jack catch lift detects 4, includes: two limit switches A41, a suspender A42 and an induction iron block A43; the two limit switches A41 are arranged at the lower part of the fixed frame 3 through a suspender crane A42 and are respectively aligned with the upper limit position and the lower limit position of the claw lifting cylinder 1; the sensing iron block A43 is arranged on the connecting nut 6, one end of the sensing iron block A is close to the A41 with the limit switch, the other end of the sensing iron block A is sleeved on the guide slide rod 2, and the sensing iron block A is driven by the claw lifting cylinder 1 to do lifting motion along the guide slide rod 2.

The below of mount 3 sets up jack catch switching and detects 5, includes: two limit switches B51, a suspender B52 and an induction iron block B53; the two limit switches B51 are hoisted at the lower part of the fixed frame 3 through a suspender B52 and are respectively aligned with the upper limit position and the lower limit position of the claw switch oil cylinder 7; the induction iron block B53 is arranged at the lower part of the claw opening and closing cylinder 7, one end of the induction iron block B is close to the limit switch B51, the other end of the induction iron block B is sleeved on the guide slide rod 2, and the induction iron block B is driven by the claw lifting cylinder 1 to do lifting motion along the guide slide rod 2.

The working process of the scheme is as follows: the claw is in an open state and is aligned with the furnace cover (shown in the attached drawing 1), a piston rod of the claw opening and closing cylinder is fixed, the cylinder barrel of the claw opening and closing cylinder moves downwards until a lower limit switch is triggered to stop, in the process, the claw lifting cylinder is closed through the connecting action of a pull rod of the claw, so that the furnace cover is grabbed (shown in the attached drawing 2), the lower opening of the smoke guide cylinder is inserted into the water seal groove, the cylinder barrel of the claw lifting cylinder is fixed, the piston rod of the claw opening and closing cylinder moves upwards until the upper limit switch is triggered to stop, in the process, a series of rods (comprising the claw opening and closing cylinder, the extension rod and the like) below the claw opening and closing cylinder are pulled to integrally move upwards, so that the furnace cover is lifted, a T-shaped sealing flue (shown in the attached drawing 3) is formed by the furnace hole in the center of the water seal groove, after smoke guide is finished, the claw lifting cylinder rod extends, the furnace cover moves downwards until the lower limit switch is triggered to stop, the claw opening cylinder is exposed, in the attached drawing 2 is lifted, the closed claw opening cylinder barrel is lifted until the upper limit switch is triggered, in the process, the smoke guide cylinder is triggered to stop the lifting cylinder is triggered, and the upper limit switch is triggered, and the smoke guide cylinder is retracted, and the lifting cylinder is opened, and the claw is opened, and the closed, and the claw is moved until the upper limit switch is opened.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (7)

1. A grab bell structure, its characterized in that:

the furnace grabbing cover structure comprises: the clamping jaw lifting cylinder (1), a fixing frame (3), an upper connecting nut (6), a clamping jaw opening and closing device and a clamping jaw (19);

the fixing frame (3) is fixedly arranged on a vehicle body platform of the smoke guide vehicle, and a through hole for a piston rod of the claw lifting cylinder (1) to pass through is arranged in the middle of the fixing frame;

the cylinder barrel of the claw lifting cylinder (1) is fixed on the top end face of the fixed frame (3), a piston rod of the claw lifting cylinder passes through a through hole in the fixed frame (3) and then is connected with the top of the claw opening and closing device through an upper connecting nut (6), and the piston rod of the claw lifting cylinder (1) stretches to drive the claw opening and closing device, the claw (19) and the like to vertically move in a series in a lifting manner;

the clamping jaw (19) is arranged at the bottom of the clamping jaw opening and closing device and is used for grabbing/putting down the furnace cover (20) under the action of the clamping jaw opening and closing device.

2. The grab furnace cover structure according to claim 1, wherein:

the jaw opening and closing device includes: the clamping jaw opening and closing cylinder (7), a lower connecting nut (8), a guide sliding sleeve (9), a lifting cross beam (11), an extension cylinder (13), an extension rod (14), a clamping hoop hinge lug (16), a pull rod (17) and a rod head hinge lug (18);

the middle part of the lifting cross beam (11) is provided with an upper through hole and a lower through hole, and a guide sliding sleeve (9) is arranged in the holes;

the lower end of the cylinder barrel of the claw opening and closing cylinder (7) is coaxially connected with the extension barrel (13);

the extension cylinder (13) penetrates through an inner hole of the guide sliding sleeve (9), and two clamp hinge lugs (16) are symmetrically arranged at the lower end of the extension cylinder;

the piston rod of the claw opening and closing cylinder (7) is connected with the top end of the extension rod (14) through a lower connecting nut (8);

the extension rod (14) is inserted into the extension cylinder (13), the lower end of the extension rod penetrates out of the bottom end of the extension cylinder (13), and the clamping jaw (19) is assembled through the rod head hinge lug (18);

the middle positions of the upper parts of the two ends of the clamping claw (19) are hinged with the bottom end of the pull rod (17), and the top end of the pull rod (17) is hinged with the clamp hinge lug (16).

3. The furnace-grasping lid structure according to claim 2, wherein:

the lower end face of the lifting cross beam (11) is provided with a smoke guide tube (12) and is coaxially assembled with the extension tube (13);

the bottom end of the extension cylinder (13) is provided with a cylinder wall cleaner (15); the cylinder wall cleaner (15) is formed by buckling two semicircular shapes together, is coaxially arranged in a clamping groove on the outer wall of the extension shaft (13), is uniformly distributed with a plurality of brushes consisting of short steel wire ropes in staggered layers along the radial direction, and scrapes up and down on the inner wall of the smoke guide cylinder (12).

4. The furnace-grasping lid structure according to claim 2, wherein:

the inner hole of the guide sliding sleeve (9) is provided with a plurality of annular grooves, graphite packing (10) is filled in the grooves, and the graphite packing (10) is dynamically sealed with the outer cylinder of the extension cylinder (13) to prevent smoke dust from overflowing.

5. The grab furnace cover structure according to claim 1, wherein:

the fixing frame (3) is provided with a guide through hole, a guide slide bar (2) is arranged in the fixing frame, and the bottom end of the guide slide bar (2) is connected with the lifting cross beam (11); the guide slide bar (2) is arranged in parallel with the piston rod of the claw lifting cylinder (1).

6. The furnace-grasping lid structure according to claim 5, wherein:

the below of mount (3) set up jack catch lift and detect (4), include: two limit switches A (41), a suspender A (42) and an induction iron block A (43);

the two limit switches A (41) are arranged at the lower part of the fixed frame (3) through a suspender crane A (42) and are respectively aligned with the upper limit position and the lower limit position of the claw lifting cylinder (1);

the induction iron block A (43) is arranged on the connecting nut (6), one end of the induction iron block A is close to the A (41) with the limit switch, the other end of the induction iron block A is sleeved on the guide slide rod (2), and the induction iron block A is driven by the claw lifting oil cylinder (1) to do lifting motion along the guide slide rod (2).

7. The grab furnace cover structure according to claim 6, wherein:

the below of mount (3) set up jack catch switching and detect (5), include: two limit switches B (51), a suspender B (52) and an induction iron block B (53);

the two limit switches B (51) are hoisted at the lower part of the fixing frame (3) through a suspender B (52) and are respectively aligned with the upper limit position and the lower limit position of the claw switch oil cylinder (7);

the induction iron block B (53) is arranged at the lower part of the claw opening and closing cylinder (7), one end of the induction iron block B is close to the limit switch B (51), the other end of the induction iron block B is sleeved on the guide slide rod (2), and the induction iron block B is driven by the claw lifting cylinder (1) to do lifting motion along the guide slide rod (2).

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