A positioning device for a counterweight of a crane

Abstract

This invention relates to the field of cranes, specifically a positioning device for a crane counterweight, comprising a body, with the counterweight mounted on a turntable of the body; a limiting block extending into a rectangular opening, with a pad on the lower surface of the limiting block pressing against the bottom surface of a through hole, and an inclined surface on the upper edge of the inner end of the through hole; fixing grooves are provided on both sides of the counterweight, and the counterweight is slidably connected within the rectangular opening, with the end of the limiting block embedded in the fixing groove; the rectangular opening can constrain the swing of the counterweight, reducing its swing and facilitating operation; when removing the counterweight, lifting the counterweight causes the fixing groove to push the limiting block upwards, and then the protrusion presses against the limiting block, causing it to rotate into the through hole. At this point, the counterweight moves up and down within the rectangular opening without the constraint of the limiting block, allowing the counterweight to be lifted and removed; installation is convenient, and removal is also relatively easy, making it more convenient than fixing with bolts.

Description

Technical Field

[0001] This invention relates to the field of cranes, specifically a positioning device for a crane counterweight. Background Technology

[0002] The installation of counterweights is a crucial part of the lifting system for large cranes, serving to maintain the crane's balance during the lifting process.

[0003] When installing counterweights on existing cranes, the counterweights are lifted to the crane's installation location and secured with bolts. Due to their weight, the counterweights are difficult to control during lifting, making it difficult to align the fixing holes on the counterweights with the threaded holes on the crane. This causes problems for the operators. Furthermore, during the process of inserting the bolts through the fixing holes and threaded holes, the counterweights' swinging causes the bolts to be subjected to radial shear forces, which can damage the threads on the bolts. Alternatively, if the end of the bolt just extends into the threaded hole, it can also compress the threads inside the threaded hole, causing damage to the threads and making them prone to loosening and slippage.

[0004] Furthermore, existing cranes require another crane to lift the counterweight to the installation position on the existing crane when installing the counterweight, which limits the installation conditions.

[0005] Therefore, a positioning device for crane counterweights is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A positioning device for a crane counterweight according to the present invention includes a machine body, a counterweight is provided behind the operator's cab of the machine body, and the counterweight is installed on the turntable of the machine body; the turntable is provided with a positioning mechanism for installing the counterweight; the positioning mechanism includes a support frame; the support frame is fixedly connected to the turntable, a rectangular opening is opened on the upper surface of the support frame, a plurality of through holes are symmetrically opened on the inner sidewall of the rectangular opening, a limiting block is rotatably connected in the through hole, the end face of the limiting block extends into the rectangular opening, a pad is provided on the lower surface of the limiting block, the pad is pressed against the bottom surface of the through hole, and the upper edge of the inner end of the through hole is provided with a bevel; fixing grooves are opened on both sides of the counterweight, the counterweight is slidably connected in the rectangular opening, the end of the limiting block is embedded in the fixing groove, and protrusions are provided on both sides of the counterweight, the upper edge of the protrusions being located below the fixing groove; the present invention provides a positioning device for a crane counterweight, which facilitates the installation work of the operator; firstly, rotate the turntable of the machine body, place the support frame on one side of the machine body, and make room for the installation. After creating an operating space, lift the counterweight from below the rectangular opening. Once the counterweight is positioned within the rectangular hole, the rectangular opening will constrain its sway, reducing it and facilitating operation. Next, align the two sides of the counterweight with the two corresponding through holes. Once the fixing groove on the counterweight is in position within the through hole, raise the counterweight further, causing its upper end to push against the limiting block. Simultaneously, the limiting block slides along the side wall of the counterweight. When the limiting block reaches the fixing groove, lower it back down. The counterweight is installed by pressing down the limiting block in the fixing groove. The limiting block then supports the counterweight within the rectangular opening, positioning it within the opening. To remove the counterweight, lift it up, and the fixing groove pushes the limiting block upwards. The protrusion then presses against the limiting block, causing it to rotate into the through hole. At this point, the counterweight can move up and down within the rectangular opening without the constraint of the limiting block, allowing it to be lifted and removed. Installation and removal are both convenient, making it more efficient than bolt fixing.

[0008] Preferably, the support frame has symmetrically opened insertion holes at its ends, which extend through to the inner sidewall of the rectangular opening. A U-shaped insertion rod is inserted into the insertion hole. A sliding hole is opened on the sidewall of the counterweight, and the end of the insertion rod extends through the sliding hole. The limiting block supports the counterweight on the support frame. The weight of the counterweight is concentrated on the limiting block, which puts a lot of pressure on it. When the machine moves, the resulting bumps will further increase the possibility of the limiting block breaking. Therefore, the insertion rod is provided. The insertion rod is first inserted into the insertion hole at the end of the support frame, then through the sliding hole on the counterweight, and finally through the insertion hole on the rectangular opening. This enhances the stability of the counterweight. However, the insertion rod needs to pass through multiple holes. If the holes are not aligned or the counterweight swings, it will hinder the installation of the insertion rod. However, the limiting block supports the counterweight in the rectangular opening in advance, which can ensure that the counterweight is positioned in the rectangular opening and ensure the coaxiality of the insertion hole and the sliding hole, thereby facilitating the insertion of the insertion rod.

[0009] Preferably, base plates are symmetrically fixed to both sides of the upper surface of the support frame. A sliding groove is formed on the base plate, and a lead screw is installed within the groove. The lead screw is driven by a support block, which is slidably connected within the groove. A crossbar is fixed to the upper end of the support block, and a main wheel is fixed to the middle of the crossbar. A main rope is wound around the main wheel, with one end extending towards the cab and wound around a winding reel located below the cab. The other end of the main rope is tied to a hook, which hooks onto a crossbeam located above the counterweight. Existing cranes require another crane to assist in installing the counterweight, limiting installation conditions. In this embodiment, the output of the gearbox is fixed to both ends of the winding reel. At the end, the winding wheel rotates, winding the main rope. The main rope lifts the counterweight into the rectangular opening, and then it is fixed to the support frame by the limit block and the insertion rod, no longer requiring the cooperation of another crane. The end of the lead screw is fixed to the motor. The rotation of the lead screw drags the support block to move in the slide groove, and at the same time drives the crossbar to move above the rectangular opening. The position of the support block is adjusted according to the position of the counterweight in the rectangular opening. Furthermore, the main rope can be used to vertically pull the counterweight, which is convenient for the installation of the counterweight. When removing the counterweight later, the main rope pulls the counterweight towards the rope. The protrusion on the counterweight presses against the limit block, causing the limit block to rotate and be placed in the through hole. Then the counterweight is lowered.

[0010] Preferably, auxiliary wheels are symmetrically arranged on both sides of the main wheel. The auxiliary wheels are fixed to the crossbeam, and auxiliary ropes are fixed to the auxiliary wheels. The ends of the auxiliary ropes are fixed to hooks, which are hooked onto the crossbeam at the upper end of the counterweight. Since the counterweight is pulled by a single main rope, the swing of the counterweight is difficult to control. Therefore, an auxiliary rope is provided, and the main rope is directly wound around the main wheel. The auxiliary rope is hooked onto the crossbar on the counterweight through the hook. The main rope pulls the main wheel to rotate, the main wheel drives the crossbeam to rotate, the crossbeam drives the auxiliary wheel to rotate, and the auxiliary rope pulls the counterweight, thereby improving the stability of the counterweight when it rises.

[0011] Preferably, the upper ends of the counterweights are fixed to both ends of the crossbeam, and the middle position of the crossbeam is disconnected. The two ends of the crossbeam extend inclinedly towards the upper surface of the counterweights. The middle position of the crossbeam is disconnected so that after the counterweights are fixed on the support frame, the hooks can be pushed to the middle position of the crossbeam to facilitate the removal of the hooks. The inclined shape of the two ends of the crossbeam allows the hooks to be stably hung on both ends of the crossbeam, so that the center of gravity of the counterweights is concentrated in the middle position of the two auxiliary ropes, and the counterweights are kept horizontal when entering the rectangular opening.

[0012] Preferably, the crossbeam has a telescopic hole on its end face, and a spring-connected slide rod is provided in the telescopic hole. The lower surface of the slide rod has multiple wedge-shaped notches, and the bottom surface of the telescopic hole has multiple through holes, with a spring-connected limiting pin in each through hole. By setting the slide rod and the limiting pin in cooperation, the hook is further constrained at both ends of the crossbeam, ensuring that the counterweight enters the rectangular opening horizontally. When the hook is removed from the crossbeam, the slide rod is pressed, and the slide rod moves into the telescopic hole. At the same time, the inclined surface of the notch gradually moves away from the inner end of the limiting pin, and the limiting pin moves into the telescopic hole. At this time, the outer end of the limiting pin no longer blocks the hook, and the hook can be removed from the crossbeam.

[0013] Preferably, a spring groove is formed between the fixing groove and the sliding hole, and a fixing pin is provided in the spring groove. One end of the fixing pin has an inclined surface and is placed in the sliding hole. The middle position of the fixing pin is connected to the spring groove by a spring. The other end of the fixing pin extends to the inner bottom surface of the fixing groove and is pointed. During the insertion of the rod into the sliding hole, the end of the rod is pressed against the inclined surface of the fixing pin, causing the fixing pin to move towards the fixing groove. At the same time, the pointed end of the fixing pin is embedded in the gap between the limiting block and the fixing groove, which constrains the rotation of the limiting block and improves the stability of the counterweight. Furthermore, the surface of the rod presses against the fixing pin, and the fixing pin, through the spring pressing the rod, further stabilizes the rod in the sliding hole. This improves the stability between the rod and the counterweight, reduces the possibility of the rod end leaving the insertion hole in the rectangular opening, and improves the stability of the counterweight in the rectangular opening.

[0014] Preferably, multiple lamp bodies are fixedly connected to both sides of the support frame, each lamp body corresponding to a through hole. A wire hole and a recess are provided on the solid portion of the base plate between the lamp body and the slide groove. The recess communicates with the slide groove, and a T-shaped rod is provided within the recess. The outer end of the T-shaped rod is slidably connected to the side wall of the support block, and a wire is fixedly connected to the inner end of the T-shaped rod. The wire passes through the wire hole and is fixedly connected to one of the lamp body's terminals. The other terminal of the lamp body is electrically connected to the positive terminal of the power supply. The negative terminal of the power supply on the machine body is electrically connected to the side wall of the support block, and the positive terminal of the power supply is electrically connected to the other terminal of the lamp body. When the support block moves to the through hole position and the support block is aligned with the through hole position, the side wall of the support block presses against the T-shaped rod. The T-shaped rod is electrically connected to the negative terminal on the side wall of the support block, and the lamp body is lit. This indicates the current position of the support block, allowing the fixing groove on the counterweight to align with the through hole when the counterweight rises, enabling the counterweight to be smoothly supported by the limiting block and achieving rapid installation of the counterweight.

[0015] Preferably, a partition bar is vertically provided on the inner sidewall of the rectangular opening. The partition bar is located between two adjacent through holes, and the lower end of the partition bar is chamfered. The partition bar separates adjacent counterweights to prevent collisions between adjacent counterweights and damage to the limiting block. At the same time, the chamfer at the bottom of the partition bar facilitates the movement of the counterweights between adjacent partition bars and reduces the possibility of the upper end of the counterweight hitting the partition bar.

[0016] Preferably, the two side walls of the spacer are evenly provided with rotating grooves, and ball bearings are rotatably connected in the rotating grooves; by setting the ball bearings, the surface of the counterweight is rubbed and the ball bearings roll upward, avoiding the upper edge of the counterweight directly hitting the spacer and causing wear to the spacer, and increasing the gap between the counterweight and the spacer.

[0017] The advantages of this invention are:

[0018] 1. The present invention, through the structural design of the positioning mechanism, can constrain the swing of the counterweight by the rectangular opening, reduce the swing of the counterweight, facilitate the operation of the counterweight by personnel, and when removing the counterweight, lift the counterweight, push the limiting block upward in the fixing groove, and then the protrusion squeezes the limiting block. At this time, the limiting block is squeezed and rotated into the through hole. That is, at this time, the counterweight moves up and down in the rectangular opening without the constraint of the limiting block, and the counterweight can be lifted and removed. It is easy to install and remove, and is more convenient than fixing with bolts.

[0019] 2. The end of the lead screw of the present invention is fixed to a motor. The rotation of the lead screw drives the support block to move in the slide groove, and at the same time drives the crossbar to move above the rectangular opening. The position of the support block can be adjusted according to the position of the counterweight block to be installed in the rectangular opening. Furthermore, the main rope can be vertically pulled to hold the counterweight block, which facilitates the installation of the counterweight block. Attached Figure Description

[0020] Figure 1 This is a perspective view of the crane and counterweight in Embodiment 1.

[0021] Figure 2 This is a first-view perspective perspective view of the support frame in Embodiment 1;

[0022] Figure 3 This is a second-view perspective perspective view of the support frame in Embodiment 1;

[0023] Figure 4 This is a cross-sectional view of the support frame in Embodiment 1;

[0024] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0025] Figure 6 This is a cross-sectional view of the beam in Example 1;

[0026] Figure 7 This is a perspective view of the counterweight block in Example 1;

[0027] Figure 8 This is a three-dimensional view of the rectangular opening and the spacer strip in Example 2.

[0028] In the diagram: 1. Body; 2. Counterweight; 3. Turntable; 4. Support frame; 5. Rectangular opening; 6. Through hole; 7. Limiting block; 8. Fixing groove; 9. Protrusion; 10. Insertion hole; 11. Insertion rod; 12. Sliding hole; 14. Base plate; 15. Support block; 16. Crossbar; 17. Main wheel; 18. Main rope; 19. Winding wheel; 20. Hook; 21. Crossbeam; 22. Auxiliary wheel; 23. Auxiliary rope; 24. Sliding rod; 25. Notch; 26. Limiting pin; 27. Fixing pin; 28. Lamp body; 29. ​​T-shaped rod; 30. Spacer bar; 31. Ball bearing. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] Example 1:

[0031] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4A positioning device for a crane counterweight includes a body 1, a counterweight 2, a turntable 3, and a support frame 4. The counterweight 2 is located behind the operator's cab of the body 1 and is mounted on the turntable 3. The turntable 3 is equipped with a positioning mechanism for mounting the counterweight 2. The positioning mechanism includes the support frame 4. The support frame 4 is fixedly connected to the turntable 3. A rectangular opening 5 is formed on the upper surface of the support frame 4. Multiple through holes 6 are symmetrically formed on the inner wall of the rectangular opening 5. Limiting blocks 7 are rotatably connected within the through holes 6. The end face of the limiting blocks 7 extends into the rectangular opening 5. The lower surface of the counterweight 2 is provided with a pad, which is pressed against the bottom surface of the through hole 6. The upper edge of the inner end of the through hole 6 is provided with a bevel. The counterweight 2 is provided with fixing grooves 8 on both sides. The counterweight 2 is slidably connected in the rectangular opening 5. The end of the limiting block 7 is embedded in the fixing groove 8. The counterweight 2 is provided with protrusions 9 on both sides, and the upper edge of the protrusions 9 is located below the fixing groove 8. This embodiment of the invention provides a positioning device for a crane counterweight, which facilitates the installation work of the operator. First, rotate the turntable 3 of the machine body 1 to place the support frame 4 on one side of the machine body 1 to free up the installation and operation space. Next, the counterweight 2 is lifted up from below the rectangular opening 5. Once the counterweight 2 is placed inside the rectangular opening 5, the rectangular opening 5 can restrain the swing of the counterweight 2, reducing its sway and facilitating operation. Then, the two sides of the counterweight 2 are aligned with the two corresponding through holes 6. After the fixing groove 8 on the counterweight is raised to the position of the through hole 6, the counterweight 2 is raised again, causing the upper end of the counterweight 2 to push the limiting block 7. At the same time, the limiting block 7 slides along the side wall of the counterweight 2. When the limiting block 7 slides to the position of the fixing groove 8, the counterweight 2 is lowered down. At this time, the fixing groove 8 presses down the limiting block 7, and then the limiting block 7 supports the counterweight 2 in the rectangular opening 5, so that the counterweight 2 is positioned in the rectangular opening 5, realizing the installation of the counterweight 2; when removing the counterweight 2, lift the counterweight 2, the fixing groove 8 pushes the limiting block 7 up, and then the protrusion 9 squeezes the limiting block 7. At this time, the limiting block 7 is squeezed and rotated into the through hole 6. That is, at this time, the counterweight 2 moves up and down in the rectangular opening 5 without the constraint of the limiting block 7, and the counterweight 2 is lifted and removed; installation is convenient, and removal is also relatively convenient, which is more convenient than fixing with bolts.

[0032] Reference Figure 2 , Figure 3 , Figure 4 and Figure 7The support frame 4 has symmetrically arranged insertion holes 10 at its ends, which extend through to the inner wall of the rectangular opening 5. A U-shaped insertion rod 11 is inserted into the insertion hole 10. A sliding hole 12 is arranged on the side wall of the counterweight 2, and the end of the insertion rod 11 extends through the sliding hole 12. The limiting block 7 supports the counterweight 2 on the support frame 4. The weight of the counterweight 2 is concentrated on the limiting block 7, which exerts a lot of pressure on the limiting block 7. When the machine body 1 moves, the resulting bumps will further increase the possibility of the limiting block 7 breaking. Therefore, the insertion rod 11 is provided. The insertion rod 11 is first inserted into the machine body 4. The rod 11 is inserted into the insertion hole 10 at the end of the support frame 4, then into the sliding hole 12 on the counterweight 2, and finally into the insertion hole 10 on the rectangular opening 5. This enhances the stability of the counterweight 2. When the rod 11 is inserted, it needs to pass through multiple holes. If the holes are not aligned or the counterweight 2 swings, it will hinder the installation of the rod 11. However, the limiting block 7 holds the counterweight 2 in the rectangular opening 5 in advance, which can ensure that the counterweight 2 is positioned in the rectangular opening 5 and ensure the coaxiality of the insertion hole 10 and the sliding hole 12, thereby facilitating the insertion of the rod 11.

[0033] Reference Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7 The support frame 4 has base plates 14 symmetrically fixed to both sides of its upper surface. A sliding groove is formed on the base plate 14, and a lead screw is installed within the groove. The lead screw is driven by a support block 15, which is slidably connected within the groove. A crossbar 16 is fixed to the upper end of the support block 15, and a main wheel 17 is fixed to the middle of the crossbar 16. A main rope 18 is wound around the main wheel 17. One end of the main rope 18 extends towards the cab and is wound around a winding reel 19 located below the cab. The other end of the main rope 18 is tied to a hook 20, which is hooked onto a crossbeam 21 located at the upper end of the counterweight 2. Existing cranes require another crane to assist in installing the counterweight 2, limiting installation conditions. In this embodiment, the output of the gearbox is fixed to both ends of the winding reel 19. At the end, the winding wheel 19 rotates, winding the main rope 18. The main rope 18 lifts the counterweight 2 into the rectangular opening 5, and then fixes it to the support frame 4 through the limiting block 7 and the insertion rod 11, no longer requiring the cooperation of another crane. The end of the lead screw is fixed to the motor. The rotation of the lead screw drags the support block 15 to move in the slide groove, and at the same time drives the crossbar 16 to move above the rectangular opening 5. The position of the support block 15 is adjusted according to the position where the counterweight 2 needs to be installed in the rectangular opening 5. Furthermore, the main rope 18 can vertically pull the counterweight 2, which is convenient for the installation of the counterweight 2. When removing the counterweight 2 later, the main rope 18 pulls the counterweight 2, and the protrusion 9 on the counterweight 2 squeezes the limiting block 7, so that the limiting block 7 rotates and is placed in the through hole 6, and then the counterweight 2 is lowered.

[0034] Reference Figure 2 , Figure 3 and Figure 4 The main wheel 17 is symmetrically provided with auxiliary wheels 22 on both sides. The auxiliary wheels 22 are fixed to the crossbeam 21. An auxiliary rope 23 is fixed to the auxiliary wheel 22. A hook 20 is fixed to the end of the auxiliary rope 23. The hook 20 is hooked to the crossbeam 21 provided at the upper end of the counterweight 2. The counterweight 2 is pulled by a single main rope 18. The swing of the counterweight 2 is difficult to control. Therefore, an auxiliary rope is provided. The main rope 18 is directly wound around the main wheel 17. The auxiliary rope 23 is hooked to the crossbar 16 on the counterweight 2 through the hook 20. The main rope 18 pulls the main wheel 17 to rotate. The main wheel 17 drives the crossbeam 21 to rotate. The crossbeam 21 drives the auxiliary wheel 22 to rotate. The auxiliary rope 23 pulls the counterweight 2, which improves the stability of the counterweight 2 when it rises.

[0035] Reference Figure 3 , Figure 4 , Figure 6 and Figure 7 The upper ends of the counterweight 2 are fixed to both ends of the crossbeam 21. The middle position of the crossbeam 21 is disconnected. The two ends of the crossbeam 21 extend inclinedly towards the upper end face of the counterweight 2. After the counterweight 2 is fixed on the support frame 4, the hook 20 is pushed to move towards the middle disconnected position of the crossbeam 21 to facilitate the removal of the hook 20. The inclined shape of the two ends of the crossbeam 21 allows the hook 20 to be stably hung on both ends of the crossbeam 21, so that the center of gravity of the counterweight 2 is concentrated in the middle position of the two auxiliary ropes 23, so that the counterweight 2 is kept horizontal and enters the rectangular opening 5.

[0036] Reference Figure 6 and Figure 7 The crossbeam 21 has a telescopic hole on its end face, and a spring-connected slide rod 24 is provided in the telescopic hole. The lower surface of the slide rod 24 has multiple wedge-shaped notches 25, and the bottom surface of the telescopic hole has multiple through holes. A limit pin 26 connected by a compression spring is provided in the through holes. By setting the slide rod 24 and the limit pin 26 to cooperate, the hook 20 is further constrained at both ends of the crossbeam 21, ensuring that the counterweight 2 enters the rectangular opening 5 horizontally. When the hook 20 is removed from the crossbeam 21, the slide rod 24 is pressed, and the slide rod 24 moves into the telescopic hole. At the same time, the inclined surface of the notch 25 gradually moves away from the inner end of the limit pin 26, and the limit pin 26 moves into the telescopic hole. At this time, the outer end of the limit pin 26 no longer blocks the hook 20, and the hook 20 can be removed from the crossbeam 21.

[0037] Reference Figure 4A spring groove is formed between the fixing groove 8 and the sliding hole 12. A fixing pin 27 is provided in the spring groove. One end of the fixing pin 27 has an inclined surface and is placed in the sliding hole 12. The middle position of the fixing pin 27 is connected to the spring groove by a spring. The other end of the fixing pin 27 extends to the inner bottom surface of the fixing groove 8 and is pointed. During the insertion of the insertion rod 11 into the sliding hole 12, the end of the insertion rod 11 presses against the inclined surface of the fixing pin 27, causing the fixing pin 27 to move towards the fixing groove 8. The other end of the fixing pin 27 is embedded in the gap between the limiting block 7 and the fixing groove 8, which constrains the rotation of the limiting block 7 and improves the stability of the counterweight 2. Furthermore, the surface of the insertion rod 11 presses against the fixing pin 27, and the fixing pin 27 further stabilizes the insertion rod 11 in the sliding hole 12 by pressing the insertion rod 11 with a spring. This improves the stability between the insertion rod 11 and the counterweight 2, reduces the possibility of the end of the insertion rod 11 dislodging from the insertion hole 10 in the rectangular opening 5, and improves the stability of the counterweight 2 in the rectangular opening 5.

[0038] Reference Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7 Multiple lamp bodies 28 are fixedly connected to both sides of the support frame 4. Each lamp body 28 corresponds to a through hole 6. A wire hole and a recess are provided in the solid part of the base plate 14 between the lamp body 28 and the slide groove. The recess communicates with the slide groove. A T-shaped rod 29 is provided in the recess. The outer end of the T-shaped rod 29 is slidably connected to the side wall of the support block 15. A wire is fixedly connected to the inner end of the T-shaped rod 29. The wire passes through the wire hole and is fixedly connected to one of the terminals of the lamp body 28. The other terminal of the lamp body 28 is electrically connected to the positive terminal of the power supply. The negative terminal of the power supply on the body 1 is electrically connected to the support block 1. On the side wall of 5, the positive terminal of the power supply is electrically connected to another terminal of the lamp body 28. When the support block 15 moves to the position of the through hole 6 and the support block 15 is opposite to the position of the through hole 6, the side wall of the support block 15 is pressed against the T-shaped rod 29. The T-shaped rod 29 is electrically connected to the negative terminal on the side wall of the support block 15, and the lamp body 28 is lit. This indicates that the position of the support block 15 at this time allows the fixing groove 8 on the counterweight 2 to align with the through hole 6 when the counterweight 2 rises, so that the counterweight 2 can be smoothly supported by the limiting block 7, realizing the quick installation of the counterweight 2.

[0039] Example 2:

[0040] Reference Figure 8Compared with Embodiment 1, as another embodiment of the present invention, the rectangular opening 5 is provided with a vertical partition 30 on its inner sidewall. The partition 30 is located between two adjacent through holes 6, and the lower end of the partition 30 is provided with a chamfer. The partition 30 separates the adjacent counterweights 2, preventing collisions between adjacent counterweights 2 and damage to the limiting block 7. At the same time, the chamfer on the lower end of the partition 30 facilitates the movement of the counterweights 2 between two adjacent partitions 30, reducing the possibility of the upper end of the counterweights 2 hitting the partition 30.

[0041] The two side walls of the spacer 30 are evenly provided with rotating grooves, and the rotating grooves are rotatably connected with ball bearings 31. By setting the ball bearings 31, the surface of the counterweight 2 is rubbed and the ball bearings 31 roll upward, avoiding the upper edge of the counterweight 2 from directly hitting the spacer 30, causing wear to the spacer 30, and increasing the gap between the counterweight 2 and the spacer 30.

[0042] Working principle: First, rotate the turntable 3 of the machine body 1 to place the support frame 4 on one side of the machine body 1, freeing up installation and operation space. Then, lift the counterweight 2 from below the rectangular opening 5. Once the counterweight 2 is placed in the rectangular opening 5, the rectangular opening 5 can restrain the swing of the counterweight 2, reducing its swing and facilitating operation. Next, align the two sides of the counterweight 2 with the two corresponding through holes 6. After the fixing groove 8 on the counterweight is raised to the position of the through hole 6, raise the counterweight 2 again, causing the upper end of the counterweight 2 to push the limiting block 7. At the same time, the limiting block 7 slides along the side wall of the counterweight 2. When the limiting block is reached... When block 7 slides to the position of fixed groove 8, counterweight block 2 is lowered. At this time, fixed groove 8 presses down on limiting block 7, and then limiting block 7 supports counterweight block 2 in rectangular opening 5, so that counterweight block 2 is positioned in rectangular opening 5, realizing the installation of counterweight block 2. When removing counterweight block 2, lift counterweight block 2, fixed groove 8 pushes up limiting block 7, and then protrusion 9 squeezes limiting block 7. At this time, limiting block 7 is squeezed and rotated into through hole 6. That is, at this time, counterweight block 2 can move up and down in rectangular opening 5 without the constraint of limiting block 7, and counterweight block 2 can be lifted and removed. Installation is convenient, and removal is also relatively convenient, which is more convenient than fixing with bolts.

[0043] The limiting block 7 supports the counterweight 2 on the support frame 4. The weight of the counterweight 2 is concentrated on the limiting block 7, which puts a lot of pressure on the limiting block 7. When the machine body 1 moves, the resulting bumps will further increase the possibility of the limiting block 7 breaking. To address this, an insertion rod 11 is provided. The insertion rod 11 is first inserted into the insertion hole 10 at the end of the support frame 4, then through the sliding hole 12 on the counterweight 2, and finally through the insertion hole 10 on the rectangular opening 5. This enhances the stability of the counterweight 2. However, the insertion rod 11 needs to pass through multiple holes. If the holes are not aligned or the counterweight 2 swings, it will hinder the installation of the insertion rod 11. However, the limiting block 7 supports the counterweight 2 in the rectangular opening 5 in advance, which can ensure that the counterweight 2 is positioned in the rectangular opening 5 and ensure the coaxiality of the insertion hole 10 and the sliding hole 12, thereby facilitating the insertion of the insertion rod 11.

[0044] The existing cranes require the cooperation of another crane when installing the counterweight 2, which limits the installation conditions. In this embodiment of the invention, the two ends of the winding wheel 19 are fixed to the output end of the gearbox. The winding wheel 19 rotates and winds the main rope 18. The main rope 18 lifts the counterweight 2 into the rectangular opening 5, and then fixes it to the support frame 4 through the limiting block 7 and the insert rod 11, which is no longer limited to the cooperation of another crane. The end of the lead screw is fixed to the motor. The rotation of the lead screw drags the support block 15 to move in the slide groove, and at the same time drives the crossbar 16 to move above the rectangular opening 5. The position of the support block 15 is adjusted according to the position of the counterweight 2 to be installed in the rectangular opening 5. Furthermore, the main rope 18 can be vertically pulled to hold the counterweight 2, which is convenient for the installation of the counterweight 2. When the counterweight 2 is removed later, the main rope 18 pulls the counterweight 2 to the rope. The protrusion 9 on the counterweight 2 squeezes the limiting block 7, so that the limiting block 7 rotates and is placed in the through hole 6. Then the counterweight 2 is lowered.

[0045] The counterweight 2 is pulled by a single main rope 18. The swing of the counterweight 2 is difficult to control, so an auxiliary rope is set up. The main rope 18 is directly wound around the main wheel 17. The auxiliary rope 23 is hooked to the crossbar 16 on the counterweight 2 through the hook 20. The main rope 18 pulls the main wheel 17 to rotate. The main wheel 17 drives the crossbeam 21 to rotate. The crossbeam 21 drives the auxiliary wheel 22 to rotate. The auxiliary rope 23 pulls the counterweight 2, which improves the stability of the counterweight 2 when it rises.

[0046] The middle position of the crossbeam 21 is broken. After the counterweight 2 is fixed on the support frame 4, the hook 20 is pushed to move to the middle broken position of the crossbeam 21 to facilitate the removal of the hook 20. The inclined shape of the two ends of the crossbeam 21 allows the hook 20 to be stably hung on the two ends of the crossbeam 21, so that the center of gravity of the counterweight 2 is concentrated in the middle position of the two auxiliary ropes 23, so that the counterweight 2 is kept horizontal and enters the rectangular opening 5.

[0047] By setting the sliding rod 24 and the limiting pin 26 to cooperate, the hook 20 is further constrained to both ends of the crossbeam 21, ensuring that the counterweight 2 enters the rectangular opening 5 horizontally; when the hook 20 is removed from the crossbeam 21, the sliding rod 24 is pressed, and the sliding rod 24 moves into the telescopic hole. At the same time, the inclined surface of the notch 25 gradually moves away from the inner end of the limiting pin 26, and the limiting pin 26 moves into the telescopic hole. At this time, the outer end of the limiting pin 26 no longer blocks the hook 20, and the hook 20 can be removed from the crossbeam 21.

[0048] During the insertion of the insertion rod 11 into the sliding hole 12, the end of the insertion rod 11 is pressed against the inclined surface of the fixing pin 27, causing the fixing pin 27 to move towards the fixing groove 8. At the same time, the other end of the fixing pin 27 is embedded in the gap between the limiting block 7 and the fixing groove 8, which constrains the rotation of the limiting block 7 and improves the stability of the counterweight 2. Furthermore, the surface of the insertion rod 11 presses against the fixing pin 27, and the fixing pin 27 further stabilizes the insertion rod 11 in the sliding hole 12 by pressing the insertion rod 11 with a spring. This improves the stability between the insertion rod 11 and the counterweight 2, reduces the possibility of the end of the insertion rod 11 dislodging from the insertion hole 10 in the rectangular opening 5, and improves the stability of the counterweight 2 in the rectangular opening 5.

[0049] The negative terminal of the power supply on the body 1 is electrically connected to the side wall of the support block 15, and the positive terminal of the power supply is electrically connected to another terminal of the lamp body 28. When the support block 15 moves to the position of the through hole 6 and the support block 15 is opposite to the position of the through hole 6, the side wall of the support block 15 is pressed against the T-shaped rod 29. The T-shaped rod 29 is electrically connected to the negative terminal on the side wall of the support block 15, and the lamp body 28 is lit. This indicates that the position of the support block 15 at this time allows the fixing groove 8 on the counterweight 2 to align with the through hole 6 when the counterweight 2 rises, so that the counterweight 2 can be smoothly supported by the limiting block 7, realizing the quick installation of the counterweight 2.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning device for a counterweight of a crane, comprising a body (1), a counterweight (2) disposed behind the cab of the body (1), the counterweight (2) being mounted on a turntable (3) of the body (1); characterized in that: The turntable (3) is provided with a positioning mechanism for installing the counterweight (2); the positioning mechanism includes a support frame (4); the support frame (4) is fixedly connected to the turntable (3), a rectangular opening (5) is opened on the upper surface of the support frame (4), and multiple through holes (6) are symmetrically opened on the inner side wall of the rectangular opening (5). A limiting block (7) is rotatably connected in the through hole (6), the end face of the limiting block (7) extends into the rectangular opening (5), and a pad is provided on the lower surface of the limiting block (7). The pad is pressed against the bottom surface of the through hole (6), and the upper edge of the inner end of the through hole (6) is provided with a slope; the counterweight (2) is provided with a fixing groove (8) on both sides, the counterweight (2) is slidably connected in the rectangular opening (5), the end of the limiting block (7) is embedded in the fixing groove (8), and the counterweight (2) is provided with a protrusion (9) on both sides, the upper edge of the protrusion (9) is located below the fixing groove (8); The support frame (4) has symmetrically opened insertion holes (10) at its ends. The insertion holes (10) extend through to the inner side wall of the rectangular opening (5). A U-shaped insertion rod (11) is inserted into the insertion hole (10). A sliding hole (12) is opened on the side wall of the counterweight (2). The end of the insertion rod (11) extends through to the sliding hole (12). A spring groove is provided between the fixing groove (8) and the sliding hole (12). A fixing pin (27) is provided in the spring groove. One end of the fixing pin (27) is provided with an inclined surface and is placed in the sliding hole (12). The middle position of the fixing pin (27) is connected to the spring groove by a spring. The other end of the fixing pin (27) extends to the inner bottom surface of the fixing groove (8) and the other end of the fixing pin (27) is pointed.

2. The positioning device for a crane counterweight according to claim 1, characterized in that: The upper surface of the support frame (4) is symmetrically fixed with base plates (14). A sliding groove is opened on the base plate (14). A lead screw is provided in the sliding groove. The lead screw is connected to a support block (15). The support block (15) is slidably connected in the sliding groove. A crossbar (16) is fixed to the upper end face of the support block (15). A main wheel (17) is fixed to the middle position of the crossbar (16). A main rope (18) is wound on the main wheel (17). One end of the main rope (18) extends towards the cab and is wound on a winding wheel (19) provided below the cab. The other end of the main rope (18) is tied with a hook (20). The hook (20) is hooked on a crossbeam (21) provided at the upper end of the counterweight block (2).

3. The positioning device for a crane counterweight according to claim 2, characterized in that: The main wheel (17) is symmetrically provided with auxiliary wheels (22) on both sides. The auxiliary wheels (22) are fixed to the crossbeam (21). An auxiliary rope (23) is fixed to the auxiliary wheel (22). A hook (20) is fixed to the end of the auxiliary rope (23). The hook (20) is hooked to the crossbeam (21) provided at the upper end of the counterweight (2).

4. The positioning device for a crane counterweight according to claim 3, characterized in that: The upper ends of the counterweight (2) are fixed at both ends of the crossbeam (21), the middle position of the crossbeam (21) is disconnected, and the two ends of the crossbeam (21) extend inclined towards the upper end surface of the counterweight (2).

5. A positioning device for a crane counterweight according to claim 4, characterized in that: The crossbeam (21) has a telescopic hole on its end face, and a spring-connected slide rod (24) is provided in the telescopic hole. The lower surface of the slide rod (24) has multiple wedge-shaped notches (25). Multiple through holes are provided on the bottom surface of the telescopic hole, and a limit pin (26) connected by a compression spring is provided in the through hole.

6. A positioning device for a crane counterweight according to claim 2, characterized in that: Multiple lamp bodies (28) are fixedly connected to both sides of the support frame (4). Each lamp body (28) corresponds to a through hole (6). A wire hole and a recess are provided on the solid part of the base plate (14) between the lamp body (28) and the slide groove. The recess is connected to the slide groove. A T-shaped rod (29) is provided in the recess. The outer end of the T-shaped rod (29) is slidably connected to the side wall of the support block (15). A wire is fixedly connected to the inner end of the T-shaped rod (29). The wire passes through the wire hole and is fixedly connected to one of the terminals of the lamp body (28). The other terminal of the lamp body (28) is electrically connected to the positive terminal of the power supply.

7. A positioning device for a crane counterweight according to claim 1, characterized in that: A partition strip (30) is vertically provided on the inner wall of the rectangular opening (5). The partition strip (30) is located between two adjacent through holes (6), and the lower end of the partition strip (30) is chamfered.

8. A positioning device for a crane counterweight according to claim 7, characterized in that: The two side walls of the spacer (30) are evenly provided with rotating grooves, and ball bearings (31) are rotatably connected in the rotating grooves.

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