Electronic limit structure for electrically powered jibs
By installing limit switches and adjustable stop structures on the electric cantilever crane, the problem that mechanical limit switches cannot effectively prevent rotation from exceeding the range is solved, achieving dual protection of safety and flexible adaptability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- UPMAX CRANES (SUZHOU) CO LTD
- Filing Date
- 2024-12-25
- Publication Date
- 2026-06-26
AI Technical Summary
The existing mechanical limit structure of electric cantilever cranes cannot effectively prevent them from exceeding the working range during rotation, which may lead to equipment damage or safety accidents, resulting in insufficient safety.
It adopts an electronic limit structure, including a limit switch and an adjustable stop bar structure. The limit switch detects the rotation range of the cantilever and disconnects the motor power when the range is exceeded. Combined with the adjustable stop bar structure, it can adapt to different column sizes and achieve dual protection.
The safety of the electric cantilever crane is improved by effectively preventing rotation from exceeding the working range through the electronic limit structure, thus achieving flexible adaptive adjustment and safety protection.
Smart Images
Figure CN224411260U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric cantilever crane technology, and in particular to the electronic limit structure of an electric cantilever crane. Background Technology
[0002] An electric jib crane is a common industrial piece of equipment, primarily used for lifting and moving heavy objects. It features a long boom (cantilever) that can rotate and extend, providing flexible operational capabilities.
[0003] Electric jib cranes typically have a set of rotation stops for mechanical limiting to prevent the crane from exceeding its preset working range during rotation, which could lead to equipment damage or safety accidents. However, limiting the rotation range of an electric jib crane solely through mechanical stops is not sufficiently safe. Therefore, how to better improve the safety of electric jib cranes is an important issue that needs to be addressed in the design of electronic limit structures for electric jib cranes. Utility Model Content
[0004] This invention provides an electronic limit structure for electric cantilever cranes to address the issue of insufficient safety in electric cantilever cranes.
[0005] This utility model solves the above-mentioned technical problems through the following technical solutions:
[0006] This utility model provides an electronic limit structure for an electric cantilever crane, including a column and a cantilever, and further including:
[0007] A limit switch structure is mounted on a cantilever.
[0008] A stop bar structure is provided, which is mounted on a column and can be adjusted according to the thickness of the column.
[0009] Preferably, the stop bar structure includes a fixed ring, a stop bar, nuts, and circular through slots. Circular through slots are evenly spaced on the side wall of the fixed ring. The stop bar is slidably connected in the circular through slots. External threads are provided on the side wall of the stop bar. Two nuts are threadedly connected to the stop bar, and the two nuts are located on the downward sides of the fixed ring.
[0010] In this technical solution, according to the working range of the cantilever, the stop bar is placed in a suitable circular through groove, and then the nut is threaded onto the stop bar and tightened to fix the stop bar.
[0011] Preferably, the thickness of the fixing ring is 10 mm.
[0012] Preferably, the stop bar structure includes a fixed housing, a snap-fit groove, and a sliding groove. The fixed housing is fixedly connected to the inner side wall of the fixed ring. Two sliding grooves and several snap-fit grooves are formed on the bottom side wall of the fixed housing. The snap-fit grooves are evenly distributed on the bottom side wall of the fixed housing, and the two sliding grooves are located on both sides of the snap-fit grooves.
[0013] Preferably, the stop bar structure includes a fixed arc plate, a movable frame, a sliding frame, a snap-fit limiting rod, a sliding plate, a threaded rod, a rotating block, and a sliding connecting block. The movable frame is slidably connected to the fixed housing. The fixed arc plate is fixedly connected to the bottom of the movable frame. A snap-fit limiting rod is slidably connected to the side wall of the movable frame. The sliding frame is slidably connected to the top of the snap-fit limiting rod. The sliding frame is slidably connected to the sliding groove. A sliding plate is slidably connected to the side wall of the sliding frame. Two sliding connecting blocks are fixedly connected to the top side wall of the sliding plate. The two sliding connecting blocks are slidably connected to the bottom side wall of the fixed housing. A threaded rod is rotatably connected to the bottom of the sliding plate. The threaded rod is threadedly connected to the sliding frame. A rotating block is fixedly connected to the bottom of the threaded rod.
[0014] In this technical solution, rotating the rotating block causes the threaded rod to rotate, which in turn causes the sliding frame to move upward. The sliding frame then causes the locking limit rod to move upward, disengaging it from the locking groove and no longer restricting the movement of the movable frame. Pulling the fixed arc plate allows the movable frame to slide within the fixed housing, adjusting the position of the fixed arc plate. This allows for better adjustment of the fixed arc plate's position based on the thickness of the column.
[0015] Preferably, the locking limit rod and the locking groove cooperate with each other.
[0016] In this technical solution, the locking limit rod descends and locks into the corresponding locking groove, which can restrict the moving frame.
[0017] Preferably, the limit switch structure includes a limit switch body, a limit switch bracket, hexagonal bolts, and a cable. The limit switch bracket is fixedly connected to the vertical pipe of the cantilever underbone, the limit switch body is fixedly connected to the limit switch bracket by four hexagonal bolts, and the cable is fixedly installed on the limit switch body.
[0018] In this technical solution, the rotating motor drives the cantilever to rotate, and the limit switch body rotates with the cantilever. When the rocker arm on the limit switch body on the cantilever touches the stop bar, the normally closed contact opens, the rotating motor is de-energized, and the cantilever stops rotating, thereby achieving protection.
[0019] Preferably, the limit switch bracket is made of angle iron.
[0020] Preferably, the hexagonal bolt is made of M5*25 hexagonal screw.
[0021] Preferably, the limit switch body is electrically connected to the rotating motor of the cantilever via a cable.
[0022] In this technical solution, the cable is a 2-core, 1-square-millimeter cable connected in series in the control circuit of the rotary motor, and it is connected in series with the normally closed contact of the limit switch body.
[0023] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.
[0024] The positive and progressive effects of this utility model are as follows:
[0025] 1. By rotating the rotating block, the rotating block drives the threaded rod to rotate, and the rotation of the threaded rod drives the sliding frame to move upward. The sliding frame drives the locking limit rod to move upward, so that the locking limit rod leaves the locking groove and no longer restricts the movement of the moving frame. Pulling the fixed arc plate, the moving frame can slide within the fixed housing, and the position of the fixed arc plate can be adjusted. This allows for better adjustment of the position of the fixed arc plate according to the size and thickness of the column, so that the stop bar structure can better cope with columns of different sizes and is more flexible in use.
[0026] 2. By fixing the stop bar in a suitable circular through slot according to the working range of the cantilever, the rotary motor rotates and drives the cantilever to rotate. The limit switch body rotates with the cantilever. When the rocker arm on the limit switch body on the cantilever touches the stop bar, the normally closed contact opens, the rotary motor is de-energized, and the cantilever stops rotating, thus achieving protection. This facilitates the installation of an electronic limit structure on the electric cantilever crane, thereby achieving double protection and improving its safety. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.
[0028] Figure 2 This is a three-dimensional structural diagram of the integral column upper stop bar structure of this utility model.
[0029] Figure 3 This is a top view of the internal structure of the stop bar structure of this utility model.
[0030] Figure 4 This is a side view of the internal structure of the stop bar structure of this utility model.
[0031] Figure 5 The whole of this utility model Figure 1 A magnified schematic diagram of the structure at point A.
[0032] Figure 6 The whole of this utility model Figure 4 A magnified schematic diagram of the structure at point B.
[0033] Figure 7 This is a schematic diagram of the internal structure of the overall sliding frame of this utility model.
[0034] Explanation of reference numerals in the attached figures
[0035] 1. Limit switch structure; 101. Limit switch body; 102. Limit switch bracket; 103. Hex bolt; 104. Cable; 2. Stop bar structure; 201. Fixed ring; 202. Stop bar; 203. Nut; 204. Circular through groove; 211. Fixed housing; 212. Snap-fit groove; 213. Sliding through groove; 221. Fixed arc plate; 222. Moving frame; 223. Sliding frame; 224. Snap-fit limit bar; 225. Sliding plate; 226. Threaded rod; 227. Rotating block; 228. Sliding connecting block; 3. Column; 4. Cantilever. Detailed Implementation
[0036] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.
[0037] like Figure 1-7 As shown, the electronic limit structure of the electric cantilever crane includes a column 3 and a cantilever 4, and also includes:
[0038] Limit switch structure 1, wherein the limit switch structure 1 is mounted on cantilever 4;
[0039] The stop bar structure 2 is mounted on the column 3 and can be adjusted according to the thickness of the column 3.
[0040] The stop bar structure 2 includes a fixed ring 201, a stop bar 202, a nut 203, and a circular through groove 204. The fixed ring 201 has circular through grooves 204 evenly spaced on its side wall. The stop bar 202 is slidably connected in the circular through groove 204. The side wall of the stop bar 202 is provided with external threads. Two nuts 203 are threadedly connected to the stop bar 202. The two nuts 203 are located on the downward sides of the fixed ring 201.
[0041] According to the working range of the cantilever 4, place the stop bar 202 in the appropriate circular through groove 204, then thread the nut 203 onto the stop bar 202 and tighten it to fix the stop bar 202.
[0042] The thickness of the fixed ring 201 is 10mm.
[0043] The stop bar structure 2 includes a fixed housing 211, a snap-fit groove 212, and a sliding through groove 213. The fixed housing 211 is fixedly connected to the inner side wall of the fixed ring 201. Two sliding through grooves 213 and several snap-fit grooves 212 are provided on the bottom side wall of the fixed housing 211. The snap-fit grooves 212 are evenly distributed on the bottom side wall of the fixed housing 211, and the two sliding through grooves 213 are located on both sides of the snap-fit grooves 212.
[0044] The stop bar structure 2 includes a fixed arc plate 221, a movable frame 222, a sliding frame 223, a snap-fit limiting rod 224, a sliding plate 225, a threaded rod 226, a rotating block 227, and a sliding connecting block 228. The movable frame 222 is slidably connected to the fixed housing 211. The bottom of the movable frame 222 is fixedly connected to the fixed arc plate 221. The snap-fit limiting rod 224 is slidably connected to the side wall of the movable frame 222. The top of the snap-fit limiting rod 224 is fixedly connected to the sliding frame 223. The sliding frame 223 is slidably connected in the sliding groove. A sliding plate 225 is slidably connected to the side wall of the sliding frame 223. Two sliding connecting blocks 228 are fixedly connected to the top side wall of the sliding plate 225. The two sliding connecting blocks 228 are slidably connected to the bottom side wall of the fixed housing 211. A threaded rod 226 is rotatably connected to the bottom of the sliding plate 225. The threaded rod 226 is threadedly connected to the sliding frame 223. A rotating block 227 is fixedly connected to the bottom of the threaded rod 226.
[0045] Rotating the rotating block 227 causes the threaded rod 226 to rotate, which in turn causes the sliding frame 223 to move upward. The sliding frame 223 then causes the locking limit rod 224 to move upward, causing the locking limit rod 224 to leave the locking groove 212 and no longer restrict the movement of the moving frame 222. Pulling the fixed arc plate 221 allows the moving frame 222 to slide within the fixed housing 211, adjusting the position of the fixed arc plate 221. This allows for better adjustment of the position of the fixed arc plate 221 according to the size and thickness of the column 3.
[0046] The locking limit rod 224 and the locking groove 212 cooperate with each other.
[0047] The locking limit rod 224 descends and locks into the corresponding locking groove 212, which can restrict the moving frame 222.
[0048] The limit switch structure 1 includes a limit switch body 101, a limit switch bracket 102, hex bolts 103, and a cable 104. The limit switch bracket 102 is fixedly connected to the vertical pipe of the cantilever 4. The limit switch body 101 is fixedly connected to the limit switch bracket 102 by four hex bolts 103. The cable 104 is fixedly installed on the limit switch body 101.
[0049] The rotating motor drives the cantilever 4 to rotate, and the limit switch body 101 rotates with the cantilever 4. When the rocker arm on the limit switch body 101 on the cantilever 4 touches the stop lever 202, the normally closed contact opens, the rotating motor is de-energized, and the cantilever 4 stops rotating, thereby achieving protection.
[0050] The limit switch bracket 102 is made of angle iron.
[0051] The hex bolt 103 is made using an M5*25 hex screw.
[0052] The limit switch body 101 is electrically connected to the rotary motor of the cantilever 4 via cable 104.
[0053] Cable 104 is a 2-core, 1-square-millimeter cable connected in series in the control circuit of the rotary motor. It is connected in series with the normally closed contact of the limit switch body 101.
[0054] In use, the electrical components mentioned in this application are all connected to an external power supply and control switch. By rotating the rotating block 227, the rotating block 227 drives the threaded rod 226 to rotate. The rotation of the threaded rod 226 drives the sliding frame 223 to move upward. The sliding frame 223 drives the locking limit rod 224 to move upward, so that the locking limit rod 224 leaves the locking groove 212 and no longer restricts the movement of the moving frame 222. Pulling the fixed arc plate 221, the moving frame 222 can slide in the fixed housing 211, and the position of the fixed arc plate 221 can be adjusted. The position of the fixed arc plate 221 can be adjusted appropriately according to the size and thickness of the column 3.
[0055] After adjustment, rotate the rotating block 227 in the opposite direction. The rotating block 227 drives the threaded rod 226 to rotate in the opposite direction. The threaded rod 226 drives the sliding frame 223 to descend. The sliding frame 223 drives the locking limit rod 224 to descend and re-lock into the corresponding locking groove 212, thus restricting the moving frame 222 and fixing the fixing arc plate 221. Weld the fixing arc plate 221 to the side wall of the column 3, so that the fixing ring 201 is fixed on the column 3. According to the working range of the cantilever 4, place the stop rod 202 in the appropriate circular through groove 204, and then thread the nut 203 onto the stop rod 202 and tighten it to fix the stop rod 202. The rotating motor rotates to drive the cantilever 4 to rotate. The limit switch body 101 rotates with the cantilever 4. When the rocker arm on the limit switch body 101 on the cantilever 4 touches the stop rod 202, the normally closed contact opens, the rotating motor is de-energized, and the cantilever 4 stops rotating, thus achieving protection.
[0056] This utility model is not limited to the above-described embodiments. Any changes in its shape or structure fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.
Claims
1. An electronic limiting structure for an electric cantilever crane, comprising a column (3) and a cantilever (4), characterized in that, Also includes: Limit switch structure (1), the limit switch structure (1) is mounted on cantilever (4); A stop bar structure (2) is provided on a column (3) and the stop bar structure (2) can be adjusted according to the thickness of the column (3); The stop bar structure (2) includes a fixed ring (201), a stop bar (202), a nut (203), and a circular through groove (204). The fixed ring (201) has circular through grooves (204) evenly spaced on its side wall. The stop bar (202) is slidably connected in the circular through groove (204). The side wall of the stop bar (202) is provided with an external thread. Two nuts (203) are threadedly connected to the stop bar (202). The two nuts (203) are located on the downward sides of the fixed ring (201). The stop bar structure (2) includes a fixed housing (211), a snap-fit groove (212), and a sliding through groove (213). The fixed housing (211) is fixedly connected to the inner side wall of the fixed ring (201). Two sliding through grooves (213) and several snap-fit grooves (212) are opened on the bottom side wall of the fixed housing (211). The snap-fit grooves (212) are evenly distributed on the bottom side wall of the fixed housing (211), and the two sliding through grooves (213) are located on both sides of the snap-fit grooves (212).
2. The electronic limiting structure of the electric cantilever crane as described in claim 1, characterized in that: The thickness of the fixed ring (201) is 10 mm.
3. The electronic limiting structure of the electric cantilever crane as described in claim 1, characterized in that: The stop bar structure (2) includes a fixed arc plate (221), a movable frame (222), a sliding frame (223), a snap-fit limiting rod (224), a sliding plate (225), a threaded rod (226), a rotating block (227), and a sliding connecting block (228). The movable frame (222) is slidably connected to the fixed housing (211). The bottom of the movable frame (222) is fixedly connected to the fixed arc plate (221). A snap-fit limiting rod (224) is slidably connected to the side wall of the movable frame (222). The top of the snap-fit limiting rod (224) is fixedly connected to the sliding frame (228). 3) The sliding frame (223) is slidably connected in the sliding groove. A sliding plate (225) is slidably connected to the side wall of the sliding frame (223). Two sliding connecting blocks (228) are fixedly connected to the top side wall of the sliding plate (225). The two sliding connecting blocks (228) are slidably connected to the bottom side wall of the fixed housing (211). A threaded rod (226) is rotatably connected to the bottom of the sliding plate (225). The threaded rod (226) is threadedly connected to the sliding frame (223). A rotating block (227) is fixedly connected to the bottom of the threaded rod (226).
4. The electronic limiting structure of the electric cantilever crane as described in claim 3, characterized in that: The locking limit rod (224) and the locking groove (212) cooperate with each other.
5. The electronic limiting structure of the electric cantilever crane as described in claim 1, characterized in that: The limit switch structure (1) includes a limit switch body (101), a limit switch bracket (102), hex bolts (103), and a cable (104). The limit switch bracket (102) is fixedly connected to the vertical pipe of the cantilever (4) under the diagonal brace. The limit switch body (101) is fixedly connected to the limit switch bracket (102) by four hex bolts (103). The cable (104) is fixedly installed on the limit switch body (101).
6. The electronic limiting structure of the electric cantilever crane as described in claim 5, characterized in that: The limit switch bracket (102) is made of angle iron.
7. The electronic limiting structure of the electric cantilever crane as described in claim 5, characterized in that: The hexagonal bolt (103) is made of M5*25 hexagonal screw.
8. The electronic limiting structure of the electric cantilever crane as described in claim 5, characterized in that: The limit switch body (101) is electrically connected to the rotating motor of the cantilever (4) via a cable (104).