A limiting device

Abstract

The application discloses a limiting device, which comprises a base, a support, a guide rod, a limiting device, a first elastic member and a weight unit. The base is connected to an external trolley frame for limiting measurement in use. The support is fixedly arranged at the bottom of the base. The top of the guide rod is arranged in the interior of the support, and the bottom of the guide rod is exposed to the support. The limiting device is fixedly arranged in the interior of the support and is screw-connected with the base through a fixed plate. The first elastic member is arranged between the top of the guide rod and the bottom of the support. The weight unit is fixedly arranged at the bottom of the support. The limiting device has a double protection function, can avoid false touch of the limiting device, has a long service life, a simple structure and a wide application range. Specifically, the limiting device is arranged in the interior of the support, can be shielded by the support, has dustproof and anti-radiation functions, avoids false touch of the limiting device due to environmental factors, and avoids the problem that the lifting mechanism is parked to affect efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoisting machinery, in particular to a limiting device. BACKGROUND

[0002] The height limiter of the crane is an essential safety device of the crane, and the setting purpose of the height limiter is to prevent the lifting hook from rising to the frame and hitting the top, and through the sensing detection of the height limiter, the control node of the related actions of the lifting hook can be cut off in advance.

[0003] The prior art is a heavy hammer limiting device for electrical products, such as sensors and other elements, which are directly bare-mounted on the frame and are sensitive to the external environment, and are not suitable for metallurgical cranes and other products, and have a small application range; and the heavy hammer limiting device of the prior art is mounted on the trolley, is affected by high temperature and dust in the external environment, and has a short service life; secondly, the existing heavy hammer limiting device only has a single on-off function and does not have a redundant protection function, and is prone to failure. SUMMARY

[0004] To solve the above-mentioned technical problems in the prior art, the present application provides a limiting device; has a double protection function, can avoid false touch of the limiting device, has a long service life, a simple structure and a wide application range.

[0005] The technical scheme of the present application is as follows:

[0006] A limiting device comprises a base, a support, a guide rod, a limiting device, a first elastic member and a heavy hammer unit.

[0007] Further, the support comprises a support body and a guide column; the support body is a column structure with an open end at one end and a closed end at the other end, a connecting table is fixedly arranged at the top of the open end, and a through hole is arranged at the bottom center of the closed end; the inner cavity of the guide column is a hollow cylindrical structure, the guide column is fixedly arranged at the bottom center of the support body, and the inner circular surface of the hollow guide column is flush with the inner wall of the through hole.

[0008] Further, the limiting device is a limit switch, and the number of the limit switch is two, two limit switches are symmetrically inverted and arranged in the bracket, the heights of the two limit switches in the bracket are consistent, and a preset distance is arranged between the two limit switches.

[0009] Further, a stop lever is arranged in the preset distance between the two limit switches, a second elastic member is fixedly arranged at the bottom of the stop lever, and the total length of the stop lever and the second elastic member in a natural state is greater than the total length of the limiting device and the fixed plate, and the total length of the stop lever and the second elastic member in a compressed state is less than the total length of the limiting device and the fixed plate.

[0010] Further, the second elastic member and the first elastic member are springs.

[0011] Further, a notch is arranged on one side of the upper part of the bracket body, and a gland for fixing the lead wire of the limiting device is detachably connected to the notch.

[0012] Further, the guide rod comprises an upper platform, a lower platform and a connecting rod.

[0013] The upper platform and the lower platform are respectively arranged in parallel on the top and the bottom of the connecting rod, a I-shaped structure is formed between the upper platform, the lower platform and the connecting rod, and the length of the upper platform is greater than the distance between the two limit switches on the bracket; and the connecting rod passes through the through hole in the center of the bottom of the closed end and moves up and down along the through hole and the guide column.

[0014] Further, a rubber pad is detachably connected to the bottom of the lower platform.

[0015] Further, the weight unit comprises a connecting rope, a weight and a magnetic supporting plate; one end of the connecting rope is fixedly connected to the center of the bottom of the lower platform through a lifting ring; the weight is detachably connected to the other end of the connecting rope; the magnetic supporting plate is arranged directly below the weight and is arranged at a preset distance from the weight, and the magnetic supporting plate is fixedly connected to an external crane or an external lifting tool.

[0016] Further, the stroke range of the weight unit compressing the first elastic member is greater than the distance from the top of the guide rod to the contact of the limit switch.

[0017] The main advantages of the technical scheme of the present application are as follows:

[0018] The application has double protection function, can avoid the limit device to be touched by mistake, has long service life, simple structure and wide application range; specifically, the limit device is arranged in the inner part of the support, the limit device has dustproof and radiation protection function through the shielding of the support, the limit device is prevented from being touched by mistake due to environmental factors, the lifting mechanism is prevented from stopping to affect the efficiency; meanwhile, the heavy hammer unit, the first elastic member and the limit device are matched with each other, so that the first elastic member can be compressed and away from the limit device when the heavy hammer is in a natural state, the lifting mechanism is lifted, the first elastic member is stretched, the limit device is triggered, the lifting mechanism is stopped, and the safety of the lifting mechanism is ensured;

[0019] Further, the support is arranged as a column structure, and the guide column is arranged at the bottom of the support body, so that the guide rod arranged in the guide column can move up and down along the guide column, and the guide rod can play a good guiding role, so that the heavy hammer is more accurately limited;

[0020] Further, the number of limit switches is two, and the heights of the two limit switches are consistent, so that the accuracy of the heavy hammer limiting is further ensured, any limit device can trigger the stopping of the lifting mechanism, and the failure of the entire device due to the failure or damage of a limit switch is avoided;

[0021] Further, the structure of the stop rod and the second elastic member makes the limit device have double limiting and protection functions, on the one hand, when the lifting mechanism is lifted and the heavy hammer unit is moved upward, the limit unit can be triggered to stop, and on the other hand, when the lifting speed of the heavy hammer unit is too fast and the limit device is impacted, the upward impact force can be buffered by the stop rod and the second elastic member to protect the limit device and play a limiting role; meanwhile, the total length of the stop rod and the second elastic member in a natural state is greater than the total length of the limit device and the fixed plate, and the total length of the stop rod and the second elastic member in a compressed state is less than the total length of the limit device and the fixed plate, so that the guide rod and the limit device are separated in a natural state, and when the stop rod is subjected to an upward force, the top of the guide rod and the limit device can be ensured to be in contact with each other, and the effectiveness of the heavy hammer limiting is ensured;

[0022] Further, the first elastic member and the second elastic member are arranged as spring structures, so that the first elastic member and the second elastic member have a certain strength and good buffering effect, and the safety and effectiveness of the limit device are further ensured;

[0023] Further, by setting a notch on one side of the bracket body and a grid for fixing the lead wire of the on-off limiting device on the notch, the lead wire for electrically connecting the external control unit and the limiting device can pass through the notch and be fixed by the grid, so that the structure of the present application is more compact.

[0024] Further, by setting the guide rod in an I-shaped structure, on one hand, the first elastic member can be stably fixed to the upper surface of the I-shaped structure and the bottom of the bracket body; on the other hand, the length of the upper surface is set to be greater than the distance between the two limiting switches on the bracket, so that the upper surface can fully contact the contacts of the two limiting devices, thereby ensuring the accuracy of the weight hammer limiting.

[0025] Further, by setting a rubber pad structure at the bottom of the lower surface, when the upward impact force on the weight hammer unit is large and the lower surface is hit, the rubber pad can play a buffering role, and also protect the lower surface and the entire device.

[0026] Further, by setting the magnetic supporting plate directly below the weight hammer, when the hoisting structure is hoisting, the weight hammer can be directly hit, so that the upward force is more sufficient, thereby improving the accuracy and effectiveness of the limiting.

[0027] Further, by setting the stroke range of the weight hammer unit compressing the first elastic member to be greater than the distance from the top of the guide rod to the contact of the limiting switch, when the weight hammer unit is subjected to an upward force, the first elastic member can ensure contact with the limiting switch when it returns to the initial state, thereby further ensuring the effectiveness of the weight hammer limiting. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. In the drawings:

[0029] Figure 1 FIG. 1 is a schematic view of the overall structure of a limiting device according to an embodiment of the present application;

[0030] Figure 2 FIG. 2 is a schematic view of the overall structure of a bracket of the limiting device according to an embodiment of the present application; Figure 1 FIG. 3 is a schematic view of the cross-sectional structure in the A-A direction of the limiting device according to an embodiment of the present application;

[0031] Figure 3 FIG. 4 is a schematic view of the overall structure of a bracket of the limiting device according to an embodiment of the present application.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1-base, 2-bracket, 3-guide rod, 4-limiting device, 5-first elastic member, 6-weight unit, 7-stop lever, 8-first elastic member, 9-second elastic member, 10-Gran, 11-rubber pad, 12-sling, 13-fixing plate;

[0034] 21-bracket body, 22-guide column, 210-connection table, 220-through hole, 23-notch;

[0035] 31-upper table, 32-lower table, 33-connecting rod;

[0036] 61-connection rope, 62-weight, 63-magnetic tray. DETAILED DESCRIPTION

[0037] To make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] The technical solutions provided by the embodiments of the present application will be described in detail below in connection with the drawings.

[0039] The present application takes a crane as an example to illustrate the structure and principle of the present application, including but not limited to cranes, all designed lifting mechanisms can adopt the structure of the present application for weight protection, such as scissor mechanisms, winches, lifting platforms, etc.

[0040] Specifically, as shown in Figures 1 to 3 , a limiting device of the present application comprises:

[0041] The base 1 is connected to an external trolley frame for limiting measurement when in use; the base 1 is a plate structure, which can be circular or rectangular, and can be selected as a polygonal structure or a frame structure of a circle, a rectangle and a polygon;

[0042] The bracket 2 is fixedly arranged at the bottom of the base 1; specifically, as shown in Figure 3 , the bracket 2 comprises a bracket body 21 and a guide column 22; the bracket body 21 is a column structure with one end being an open end and the other end being a closed end, and a connection table 210 is fixedly arranged at the top of the open end, and a through hole 220 is arranged at the bottom center of the closed end; the inner cavity of the guide column 22 is a hollow cylindrical structure, the guide column 22 is fixedly arranged at the bottom center of the bracket body 21, and the inner circular surface of the hollow guide column 22 is flush with the inner wall of the through hole 220.

[0043] Specifically, the length of the guide column 22 is less than the length of the connecting rod 33.

[0044] Preferably, the outer periphery or side of the column structure is a cylindrical or prismatic structure, and the inside is a hollow cylindrical structure, that is, a circular hole is arranged at the center of the cylindrical or prismatic column, forming a cylindrical structure, and a through hole is arranged at the bottom of the cylindrical structure, that is, the through hole 220 of the closed end bottom; specifically, the diameter of the circular hole opened at the open end of the above-mentioned one end is greater than the diameter of the through hole 220.

[0045] Preferably, the connecting table 210 is a circular ring structure, and the connecting table 210 of the circular ring structure is preferably integrally formed with the support body 21. The inner ring diameter of the circular ring structure is the same as the diameter of the circular hole of the column structure. When the connecting table 210 is arranged above the support body 21, the inner hole surface of the support body 21 is flush with the inner ring surface of the connecting table 210; alternatively, the connecting table 210 is a plurality of ear seat structures, which are uniformly distributed on the top of the outer side of the support body 21 and on the support body 21. The top of each ear seat is flush with the top surface of the support body 21.

[0046] The guide rod 3 is arranged inside the support 2 at the top and exposed outside the support 2 at the bottom; specifically, the guide rod 3 includes an upper table 31, a lower table 32 and a connecting rod 33; the upper table 31 and the lower table 32 are respectively arranged parallel to the top and bottom of the connecting rod 33, and the upper table 31, the lower table 32 and the connecting rod 33 form an I-shaped structure, and the length of the upper table 31 is greater than the distance between the two limit switches on the support 2; and the connecting rod 33 passes through the through hole 220 at the center of the closed end bottom and moves up and down along the through hole 220.

[0047] Therefore, the upper table 31 can be in sufficient contact with the contacts of the two limit devices 4, thereby ensuring the accuracy of the limit of the weight 62.

[0048] Specifically, the diameter of the guide column 22 is less than the diameter of the through hole 220, so that the guide column 22 can move up and down in the through hole 220, and the structure of the guide column 22 can play a good guiding role.

[0049] Specifically, the upper table 31 and the lower table 32 are disc-shaped structures, and the connecting rod 33 is a cylindrical structure, and the upper table 31 and the lower table 32 are arranged in parallel; alternatively, the upper table 31 and the lower table 32 are elliptical, rectangular or polygonal structures, and when they are the above-mentioned optional structures, the two structures of the upper table 31 and the lower table 32 are symmetrically distributed along the horizontal cross section of the connecting rod 33. Preferably, the upper table 31 and the connecting rod 33 are connected by threads, and the connecting rod 33 and the lower table 32 are integrally formed.

[0050] The limiting device 4 is fixedly arranged in the inner part of the support 2, is screwed to the support 2 through the fixing plate 13, and is electrically connected to the control end of the external control unit. Specifically, the limiting device 4 is a limit switch, and the number of the limit switches is two. The two limit switches are symmetrically arranged upside down in the inner part of the support 2, and the heights of the two limit switches in the inner part of the support 2 are consistent, that is, the contacts of the two limit switches are vertically arranged downward, and a preset distance is arranged between the two limit switches. The preset distance is used for arranging the stop rod 7, and the preset distance is determined according to the size range of the stop rod 7.

[0051] Therefore, the accuracy of the heavy hammer limiting is guaranteed, any triggering of the limiting device 4 can realize the parking of the lifting mechanism, and the failure of the entire device caused by the failure or damage of a limit switch is avoided.

[0052] Specifically, the stop rod 7 is arranged in the preset distance between the two limit switches, and the second elastic member 9 is fixedly arranged at the bottom of the stop rod 7. The total length of the stop rod 7 and the second elastic member 9 in the natural state is greater than the total length of the limiting device 4 and the fixing plate 13, and the total length of the stop rod 7 and the second elastic member 9 in the compressed state is less than the total length of the limiting device 4 and the fixing plate 13. Therefore, the guide rod 3 and the limiting device 4 can be in a separated state in the natural state, and when the stop rod 7 is subjected to an upward force, the top of the guide rod 3 and the limiting device 4 can be ensured to be in contact with each other, thereby guaranteeing the effectiveness of the heavy hammer 62 limiting.

[0053] Specifically, the stop rod 7 is a cylindrical or rectangular metal rod, which is preferably made of 45 steel. The second elastic member 9 and the top of the stop rod 7 are preferably connected in a sleeved manner.

[0054] The first elastic member 85 is arranged between the top of the guide rod 3 and the bottom of the support 2. Specifically, the first elastic member 85 is arranged between the upper table surface 31 of the guide rod 3 and the bottom of the support body 21 of the support 2. In this way, the two ends of the first elastic member 85 are limited and blocked by the table surface and the bottom surface, so that the first elastic member 85 can stably realize its effect.

[0055] The heavy hammer unit 6 is fixedly arranged at the bottom of the support 2. Specifically, the heavy hammer unit 6 includes a connecting rope 61, a heavy hammer 62, and a magnetic supporting plate. One end of the connecting rope 61 is fixedly connected to the center of the bottom of the lower table surface 32 through the lifting ring 12. The heavy hammer 62 is detachably connected to the other end of the connecting rope 61. The magnetic supporting plate is arranged directly below the heavy hammer 62 and has a preset distance from the heavy hammer 62. The magnetic supporting plate is fixedly connected to an external crane or an external lifting tool.

[0056] Specifically, the connecting rope 61 can be replaced by a rigid connecting member, such as a metal rod or a non-metal rod with certain strength and toughness.

[0057] Specifically, the magnetic supporting plate is a plate-shaped structure made of metal or plastic, and a strong magnet is fixedly arranged on the plate-shaped structure, or the plate-shaped structure is made of a strong magnetic material; and the weight 62 contains a magnetic pole opposite to the magnetic supporting plate or repels each other, so that when the magnetic supporting plate moves, the weight 62 can be prompted to move in the corresponding direction.

[0058] Specifically, the second elastic member 9 and the first elastic member 85 are springs. The spring is a compression spring, and the hardness of the compression spring is adjusted according to the actual application, so that the first elastic member 85 and the second elastic member 9 have a certain strength while having a good buffering effect, further guaranteeing the safety and effectiveness of the limiting device 4.

[0059] Specifically, a notch 23 is arranged on one side of the upper part of the bracket body 21, and a gland 10 for fixing the lead wire of the limiting device 4 is detachably connected on the notch 23. Thus, the structure of the present application can be more compact.

[0060] Specifically, the function of the gland 10 is to fix the buckle, soft plug and card slot of the cable or power lead wire.

[0061] Specifically, the rubber pad 11 is detachably connected to the bottom of the lower surface 32. Thus, the impact and damage of the weight unit 6 on the bottom of the lower surface can be avoided, and further the damage to the device of the present application can be avoided.

[0062] Specifically, the stroke range of the weight unit 6 compressing the first elastic member 85 is greater than the distance from the top of the guide rod 3 to the contact of the limit switch, so that when the weight unit 6 is subjected to an upward force, the first elastic member 5 can guarantee contact with the limit switch when it returns to the initial state, further guaranteeing the effectiveness of the weight limiting.

[0063] Specifically, the limiting device of the present application, when installing, first passes the connecting rod 33 of the guide rod 3 through the through hole 220 of the guide column 22 below the bracket body 21, then sets the first elastic member 85 above the connecting rod 33, then fixes the upper table 31 and the connecting rod 33 by screwing, secondly fixes the threaded connection fixing plate 13 on the base 1 symmetrically, and fixes the limiting device 4 by screwing through the fixing plate 13, and vertically downwardly fixes the limiting contact of the limiting device 4, then screws the limiting device 4 between the two limiting devices 4, welds the second elastic member 9 on the limiting rod 7, and passes the wire of the limiting device 4 out of the gland 10, and then reversely fixes the base 1 on the bracket 2, so that the limiting device 4 and the guide rod 3 assembled on the base 1 are located above the upper table 31, and the second elastic member 9 connected with the limiting rod 7 is in contact with the top of the upper table 31, then fixes the base 1 and the bracket 2 by screwing and bolting, then screws the lifting ring 12 at the bottom of the lower table 32, and pastes the rubber pad 11 at the bottom of the lower table 32, then fixes the structure of the present application on the external bracket 2 where the weight 62 is limited, and finally suspends the connecting rope 61, the weight 62 and the magnetic tray 63 on the lifting ring 12 in sequence, and the assembly of the limiting device 4 of the present application is completed.

[0064] It should be noted that the above assembly method and assembly sequence are not fixed and unchangeable, and the assembly sequence can be adjusted according to actual conditions while ensuring the assembly effect and precision. The above assembly method is only an exemplary description and is one of the assembly methods.

[0065] Under normal working conditions, the lower spring is in a compressed state under the action of the gravity of the hammer body, and the guide rod 3 does not touch the limit; when the weight 62 is completely lifted, the guide rod 3 moves upward under the action of the spring, so that the upper table 31 at the top of the guide rod 3 touches the contact of the limit switch, and then the limit switch transmits the limit signal to the external control unit, controls the lifting mechanism to stop the lifting action, and the mechanism stops, thereby ensuring the lifting safety.

[0066] It should be noted that the limit switch and the limit are related to each other; the magnetic tray 63 is lifted under the driving action of the structure, causing the weight 62 to be lifted under the action of the magnetic force, and then the first elastic member 85 loses the gravity, causing the upper table 31 of the guide rod 3 to be in contact with the contact switch of the limiting device 4, and the limit switch receives the limit signal or instruction and transmits or issues the stop signal, and the lifting mechanism stops.

[0067] It should be further noted that the external control unit is a structure such as a controller, which is used to receive the limit signal of the limit switch, and transmit the limit signal to the controller of the mechanism, or convert the limit signal into a limit instruction and issue it to the lifting mechanism, and the lifting mechanism stops after receiving the instruction.

[0068] The weight limiting structure of the limiting device is a mechanical closed structure, has dustproof and anti-radiation functions, and can effectively prolong the service life of the limiting device; the limiting switch is inside the support 2, and has a good working environment, and thus is not sensitive to the harsh environment, expands the application range of the weight limiting device, and can be applied to a metallurgical crane in a harsh environment.

[0069] The limiting device has double protection functions, two limiting switches are arranged in the device, and the device can be parked when any one of the two limiting switches is triggered, so that the device is not disabled due to failure of a limiting switch; the structure is provided with a weight 62 and a guide rod 3 double-position trigger switch, the weight 62 is first lifted by a lifting appliance in the lifting process, the guide rod 3 is moved upward under the action of a spring, a limit is triggered, and the mechanism is parked; when the weight 62 fails to trigger, the lifting appliance continues to lift the guide rod 3 to move upward, a limit is triggered, and the mechanism is parked, and the design can effectively improve the safety performance of the weight 62 device and avoid causing serious accidents.

[0070] The limiting device 4 has simple structure, low cost, flexible and reliable action, convenient installation, long service life, wide application range, double protection functions, and can effectively improve the safety performance of the weight device, and provides a new structure form for the weight limiting device 4.

[0071] It should be noted that, in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In addition, "front", "back", "left", "right", "up", "down" in this text are with reference to the placement state shown in the drawings.

[0072] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A position limiting device, characterized by, The utility model relates to a kind of limit measuring device, including: Base, which is arranged on the trolley frame for limiting measurement outside in use; Support, which is fixedly arranged at the bottom of the base; Guide rod, the top of which is arranged inside the support, and the bottom is exposed to the support; Limiting device, which is fixedly arranged inside the support, is connected with the base through a fixed plate screw thread, and is connected to the control end of the external control unit through a cable; First elastic member, which is arranged between the top of the guide rod and the bottom of the support; Weight unit, which is fixedly arranged at the bottom of the support; The support includes a support body and a guide column; The support body is a column structure with one end being an open end and the other end being a closed end, a connecting table is fixedly arranged at the top of the open end, and a through hole is arranged at the center of the bottom of the closed end; The inner cavity of the guide column is a cylindrical structure, the guide column is fixedly arranged at the center of the bottom of the support body, and the inner circular surface of the hollow guide column is flush with the inner wall of the through hole; The limiting device is a limit switch, and the number of limit switches is two, two limit switches are arranged symmetrically and upside down inside the support, the heights of two limit switches inside the support are consistent, and a preset distance is arranged between two limit switches; A stop lever is arranged within the preset distance between two limit switches, a second elastic member is fixedly arranged at the bottom of the stop lever, and the total length of the stop lever and the second elastic member in natural state is greater than the total length of the limiting device and the fixed plate, and the total length of the stop lever and the second elastic member in compressed state is less than the total length of the limiting device and the fixed plate; A notch is arranged on one side of the upper part of the support body, and a gland for fixing the lead of the limiting device is detachably connected to the notch, so that the lead for electrically connecting the external control unit and the limiting device can pass through the notch and be fixed by the gland; The guide rod includes an upper table, a lower table and a connecting rod; The upper table and the lower table are respectively arranged in parallel at the top and the bottom of the connecting rod, a H-shaped structure is formed between the upper table, the lower table and the connecting rod, and the length of the upper table is greater than the distance between the two limit switches of the support; The connecting rod passes through the through hole at the center of the bottom of the closed end of the support body and moves up and down along the through hole; A rubber pad is detachably connected to the bottom of the lower table.

2. A stop device according to claim 1, wherein The second elastic member and the first elastic member are springs.

3. A stop device according to claim 1, wherein The weight unit includes a connecting rope, a weight and a magnetic supporting plate; One end of the connecting rope is fixedly connected to the center of the bottom of the lower table of the guide rod through a lifting ring; The weight is detachably connected to the other end of the connecting rope; The magnetic supporting plate is arranged directly below the weight, a preset distance is arranged between the weight and the magnetic supporting plate, and the magnetic supporting plate is fixedly connected to an external lifting mechanism or an external lifting device.

4. A stop device according to claim 1, wherein The stroke range of the weight unit compressing the first elastic member is greater than the distance from the top of the guide rod to the limit switch.

Images