Chain elevator with adjustable balance weight

Abstract

The chain elevator with the adjustable balance weight comprises a driving unit, a load unit, a balance weight unit, a frame unit and a chain, the driving unit drives the load unit and the balance weight unit to move up and down in the frame unit through the chain, and the load unit and the balance weight unit are connected through the chain and have opposite movement trends. The elevator has the advantages that the weight of the load unit in the elevator is balanced by additionally arranging the counterweight unit, the output capacity needed by the driving unit is reduced, the cost of the driving unit is reduced, meanwhile, the counterweight unit with the adjustable weight is adopted, and the weight of the elevator is adjusted. The elevator is simple in structure and suitable for the working condition environment with large load weight change, the requirement for the output capacity of the driving unit is further lowered, meanwhile, the closed-loop chain connecting mode is adopted, and abnormal sound generated by equipment internal collision or chain non-tensioning in the working process of the elevator is effectively avoided.

Description

Technical Field

[0001] The present application is applied to the field of automated transportation, and specifically relates to a chain hoist with adjustable counterweight. Background Art

[0002] The elevator is a commonly used conveying device in the field of automated conveying, which is used to move the load from a conveyor line at one height to a conveyor line at another height. In the prior art, when the load is heavy, the torque requirement for the drive motor is high, which increases the cost. At the same time, during the process of the elevator lifting the load, vibration or impact may occur, affecting the device. Summary of the invention

[0003] In view of the above reasons, the present application discloses a chain hoist with adjustable counterweight, comprising a drive unit, a load unit, a counterweight unit, a frame unit and a chain, wherein the drive unit drives the load unit and the counterweight unit to move up and down in the frame unit through the chain, the load unit and the counterweight unit are connected through the chain and have opposite movement tendencies, and the weight of the counterweight unit can be adaptively adjusted according to the weight of the load unit.

[0004] Preferably, a first double-row sprocket is provided at the upper end of the first side of the frame unit, and a first single-row sprocket is provided at the upper end of the second side of the frame unit, the first side and the second side are opposite sides, the chain includes a first chain and a second chain, one end of the first chain is connected to the upper end of the counterweight unit, the other end of the first chain is connected to the load unit near the upper end of the second side after passing through the first double-row sprocket and the first single-row sprocket, one end of the second chain is connected to the upper end of the counterweight unit, the other end of the second chain is connected to the load unit near the upper end of the first side after passing through the first double-row sprocket, and the driving unit drives the first double-row sprocket to rotate.

[0005] Preferably, a second double-row sprocket is provided at the lower end of the first side of the frame unit, a second single-row sprocket is provided at the lower end of the second side of the frame unit, the chain also includes a third chain and a fourth chain, one end of the third chain is connected to the lower end of the counterweight unit, the other end of the third chain is connected to the load unit near the lower end of the second side after passing through the second double-row sprocket and the second single-row sprocket, one end of the fourth chain is connected to the lower end of the counterweight unit, the other end of the fourth chain is connected to the load unit near the lower end of the first side after passing through the second double-row sprocket.

[0006] Preferably, the counterweight unit includes a manual counterweight mechanism, which includes a counterweight frame and a counterweight plate, the counterweight frame has a horizontally open accommodating portion, a plurality of the counterweight plates can be stacked in the accommodating portion, and the number of the counterweight plates is positively correlated with the weight of the load unit.

[0007] Preferably, one side of the weight plate has a notch portion, and when a plurality of the weight plates are stacked on the accommodating portion, adjacent stacked notches are stacked in an offset manner in a vertical direction.

[0008] Preferably, the counterweight unit also includes an electrically controlled counterweight mechanism, which includes a first electromagnet, a second electromagnet and a supplementary counterweight block, wherein the first electromagnet is arranged at the lower end of the counterweight frame, and the second electromagnet is arranged at the lower end of the first side of the frame unit, and the supplementary counterweight block is adsorbed on the first electromagnet or the second electromagnet according to the power supply status of the first electromagnet and the second electromagnet.

[0009] Preferably, the driving unit comprises a motor and a driving shaft, the driving shaft is horizontally connected to the first double-row sprocket, and the motor is connected to the driving shaft.

[0010] Preferably, a maintenance limit mechanism is also included, which includes a limit plate, a positioning pin and a pin seat. The limit plate is arranged at one end of the drive shaft and rotates coaxially with the drive shaft. A limit hole is provided at an eccentric position of the limit plate. The pin seat is arranged on the frame unit. The positioning pin can be inserted into the pin seat and pass through the limit hole, thereby limiting the rotation of the drive shaft.

[0011] Preferably, a first slide rail in a vertical direction is provided on the first side of the frame unit, and the counterweight unit is connected to the first slide rail and is arranged on the first side of the frame unit.

[0012] Preferably, the frame unit is provided with a second slide rail in a vertical direction, and the load unit is arranged in the frame unit in cooperation with the second slide rail.

[0013] The advantage of the present application is that by adding a counterweight unit to balance the weight of the load unit in the elevator, the output capacity required by the drive unit is reduced, and the cost of the drive unit is reduced. At the same time, a counterweight unit with adjustable weight is adopted, which is suitable for working conditions with large changes in load weight, further reducing the output capacity requirements of the drive unit. At the same time, a closed-loop chain connection method is adopted, which effectively avoids abnormal noise caused by internal collision of the equipment or loose chain during the operation of the elevator.

[0014] Other specific features and specific advantages of the present application will be described in the subsequent description, or some features and advantages can be inferred or unambiguously determined from the description, or can be learned by implementing the above-mentioned technology of the present disclosure.

[0015] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the structure of this application.

[0018] Figure 2 This is a top view of the structure of this application.

[0019] Figure 3 This is a schematic diagram of the rear structure of the hidden frame unit of the present application.

[0020] Figure 4 This is a simplified schematic diagram of the partial structure of the chain, counterweight unit and load unit of the present application.

[0021] Figure 5 This is a partial structural diagram of the counterweight unit of this application.

[0022] Figure 6 This is a schematic diagram of the partial structure of the drive unit of this application.

[0023] In the figure: 1, profile frame; 2, load frame; 3, roller conveyor; 4, load; 5, first double-row sprocket; 6, first single-row sprocket; 7, first chain; 8, second chain; 9, second double-row sprocket; 10, second single-row sprocket; 11, third chain; 12, fourth chain; 13, counterweight frame; 1301, accommodating portion; 14, counterweight plate; 1401, notch portion; 15, counterweight cover plate; 16, adjustable nut; 17, first electromagnet; 18, second electromagnet; 19, additional counterweight block; 20, motor; 21, drive shaft; 22, limit plate; 23, positioning pin; 24, pin seat; 25, safety clamp assembly; 26, first slide rail; 27, slider; 28, second slide rail; 29, guide shoe. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figures 1 to 4As shown, the frame unit is a rectangular profile frame 1 surrounded by a plurality of frame profiles, which plays a supporting and protective role. The load unit is placed in the rectangular profile frame 1. The load unit can be a load frame 2 surrounded by a plurality of profiles. A horizontal conveying device is arranged in the load frame 2, which can be a conventional conveying device such as a roller conveyor 3 and a belt conveyor. The present application takes the roller conveyor 3 as an implementation method, and the load 4 is placed on the conveying surface of the roller conveyor 3. The roller conveyor 3 provides the horizontal conveying capacity for the load 4. The counterweight unit is placed on the first side of the profile frame 1, and a first double-sided conveyor is arranged at the upper end of the first side of the profile frame 1. A row of sprocket wheels 5, the first double-row sprocket wheel 5 is a sprocket wheel with a double-row toothed disc, which can drive two chains to run synchronously at the same time, and a first single-row sprocket wheel 6 is provided at the upper end of the second side of the profile frame 1, wherein the first side and the second side are opposite sides, that is, the left side and the right side of the profile frame 1, or the front side and the rear side of the profile frame 1, one end of the first chain 7 is fixedly connected to the upper end of the counterweight unit, and the other end is wound around one row of toothed discs of the first double-row sprocket wheel 5, and after being wound around the first single-row sprocket wheel 6, it is fixedly connected to the upper end of the load frame 2 near the second side, one end of the second chain 8 is fixedly connected to the upper end of the counterweight unit, and the other end of the second chain 8 is wound around After the toothed disc of the first double-row sprocket 5 not occupied by the first chain 7 is provided, it is fixedly connected to the upper end of the load frame 2 close to the first side, and the driving unit drives the first double-row sprocket 5 to rotate. During the rotation of the first double-row sprocket 5, the first chain 7 and the second chain 8 are driven to drive the load frame 2, the roller conveyor 3 and the load 4 thereon to rise vertically. At the same time, the corresponding counterweight unit is driven by the first chain 7 and the second chain 8 to descend vertically. By setting the counterweight unit, the weight of the load unit can be balanced, so that the driving unit can use a smaller driving force to complete the lifting and lowering operation of the load unit. Due to the actual working conditions, Different loads 4 on the roller conveyor 3 may have large weight differences. If the weight of the counterweight unit is fixed, there will be a mismatch between the weight of the counterweight unit and the load unit, and the drive unit will need to increase the driving force, which will cause a greater burden on the drive unit, or a drive unit with greater torque will be selected to increase the cost of use. The weight of the counterweight unit in this application can be adaptively adjusted according to the weight of the load unit. When the load 4 is lighter, the weight of the counterweight unit is reduced. When the load 4 is heavier, the weight of the counterweight unit is increased accordingly, thereby reducing the demand for changes in the driving force of the drive unit, saving costs, and improving the conveying efficiency.

[0026] In some embodiments, Figures 1 to 4As shown, a second double-row sprocket 9 is provided at the lower end of the first side of the profile frame 1, and a second single-row sprocket 10 is provided at the lower end of the second side of the profile frame. The position of the second double-row sprocket 9 corresponds to the position of the first double-row sprocket 5 up and down, and the position of the second single-row sprocket 10 corresponds to the position of the first single-row sprocket 6 up and down. The second double-row sprocket 9 and the second single-row sprocket 10 are both freely rotatable free wheels. The second double-row sprocket 9 is a sprocket with a double-row toothed disc. One end of the third chain 11 is connected to the lower end of the counterweight unit, and the other end of the third chain 11 is wound around a row of toothed discs of the second double-row sprocket 9, and then wound around the second single-row sprocket 10, and then fixedly connected to the lower end of the load frame 2 near the second side, and one end of the fourth chain 12 is connected to the lower end of the counterweight unit Then, the other end of the fourth chain 12 is wrapped around the other row of toothed discs of the second double-row sprocket 9 and is fixedly connected to the lower end of the load frame 2 near the first side. The first chain 7 and the second chain 8 lift the load unit and the counterweight unit, and the third chain 11 and the fourth chain 12 tension the first chain 7 and the second chain 8. That is, during the driving process, the first chain 7, the second chain 8, the third chain 11, the fourth chain 12, the load unit and the counterweight unit form a power closed loop on the vertical plane, which can effectively reduce the shaking of the load unit and the counterweight unit during the vertical up and down displacement, reduce the abnormal noise caused by contact with the profile frame 1 or other components during the movement, and increase the service life of the equipment.

[0027] It should be noted that for stability reasons, the first chain 7, the second chain 8, the third chain 11, the fourth chain 12 and the corresponding first double-row sprocket 5, the first single-row sprocket 6, the second double-row sprocket 9, the second single-row sprocket 10 can be multiple groups arranged in parallel, depending on actual needs, and this application does not impose any restrictions.

[0028] In some embodiments, Figures 1 to 5 As shown, the counterweight unit includes a manual counterweight mechanism, which includes a counterweight frame 13 and a counterweight plate 14. The counterweight frame 13 has a horizontally open accommodating portion 1301, and the specific opening direction can be a horizontal opening direction away from the second side for easy operation by personnel. The counterweight plate 14 is a sheet metal, and the counterweight plate 14 can be stacked in the accommodating portion 1301. The number of counterweight plates 14 placed in the counterweight frame is adjusted according to the weight of the load unit to achieve dynamic balance and reduce the maximum output torque requirement of the drive unit, wherein the first chain 7 and the second chain 8 are respectively connected to the top end of the counterweight frame 13, and the third chain 11 and the fourth chain 12 are respectively connected to the bottom end of the counterweight frame 13.

[0029] In some embodiments, Figure 5As shown, a weight cover 15 is provided at the opening position of the accommodating portion 1301. After the weight cover 15 is in the open state, the weight plate 14 can be placed in the accommodating portion 1301 or taken out from the accommodating portion 1301. When completed, the weight cover 15 is closed to prevent the weight plate 14 from moving out of the accommodating portion 1301 during the lifting process.

[0030] In some embodiments, Figure 5 As shown, a clamping member is provided above the counterweight frame 13, and the clamping member may be an adjustable nut 16 that passes through the upper surface of the counterweight frame 13 and the interior of the accommodating portion 1301. When the counterweight plates 14 are stacked in the accommodating portion 1301, the adjustable nut 16 can be rotated to make the bottom end of the adjustable nut 16 abut against the counterweight plate 14 stacked on the top, thereby pressing the stacked counterweight plates 14 in the accommodating portion 1301 to prevent displacement and collision of the counterweight plates 14 and the generation of abnormal noise during the lifting and lowering process.

[0031] In some embodiments, Figure 5 As shown, one side of the weight plate 14 has a notch portion 1401 that is recessed inwardly. When multiple weight plates 14 are stacked in the accommodating portion 1301, the notch portion 1401 faces the opening direction of the accommodating portion 1301, and the notches 1401 of the upper and lower adjacent stacked weight plates 14 are staggered and stacked in the vertical direction. Due to the presence of the notch portion 1401, it is convenient to manually remove the stacked single weight plates 14, and the problem that the vertical surface of the stacked weight plates 14 facing the opening direction of the accommodating portion 1301 is flat and inconvenient to directly remove is prevented from occurring.

[0032] In some embodiments, Figures 1 to 5As shown, the counterweight unit also includes an electrically controlled counterweight mechanism, which includes a first electromagnet 17, a second electromagnet 18 and a supplementary counterweight block 19, wherein the first electromagnet 17 is arranged at the lower end of the counterweight frame 13, the second electromagnet 18 is arranged at the lower end of the first side of the profile frame 1, and is fixedly connected to the profile frame 1, the second electromagnet 18 corresponds to the first electromagnet 17 in position up and down, the supplementary counterweight block 19 is an iron block or a plastic-coated iron block that can be magnetically adsorbed, usually with a large weight, and the specific weight can be selected according to the actual load condition, the first electromagnet 17 and the second electromagnet 18 can generate magnetism according to their respective power-on conditions, that is, the corresponding electromagnet generates magnetism after power is turned on, and the magnetism disappears after power is turned off. Under normal conditions, the second electromagnet 18 is energized and has magnetism, and the supplementary counterweight block 19 is adsorbed on the second electromagnet 18, located at the lower end of the first side of the profile frame 1, and has no effect on the up and down vertical stroke of the counterweight unit. When it is necessary to add supplementary counterweight to the counterweight unit, the first electromagnet 17 is energized and the second electromagnet 18 is de-energized. When the counterweight frame 13 is located in the lower stroke position with the first electromagnet 17, the supplementary counterweight block 19 is adsorbed by the first electromagnet 17, and the weight of the supplementary counterweight block 19 is increased on the counterweight unit to adapt to higher load scenarios. If a smaller counterweight unit weight is required, when the counterweight frame 13 moves to the lower stroke position, the first electromagnet 17 is disconnected from the power supply state, and the second electromagnet 18 is powered on at the same time, and the additional counterweight block is adsorbed on the second electromagnet 18 to complete the weight reduction of the counterweight unit. The power supply state of the first electromagnet 17 and the second electromagnet 18 can be achieved by an electrically controlled switch. The electrically controlled counterweight mechanism is suitable for situations where the load weight switching changes are relatively fixed and the weight changes are large. No manual handling operation is required, and it can be achieved by switching the switch state of the electrically controlled switch to control the corresponding electromagnet to be powered on and off.

[0033] In some embodiments, Figure 1 , Figure 3 and Figure 6 As shown, the driving unit includes a motor 20 and a driving shaft 21. The motor 20 is fixedly arranged at the top of the profile frame 1. The motor 20 is connected to the driving shaft 21 through a coupling. The driving shaft 21 is inserted between the bearing seats fixedly arranged at the top of the profile frame 1. The driving shaft 21 is in the horizontal direction. At the same time, the driving shaft 21 is connected to the first double-row sprocket 5. When the motor 20 drives the driving shaft 21 to rotate, it also drives the first double-row sprocket 5 to rotate, thereby driving the counterweight unit and the load unit to move up and down. Since the counterweight unit balances the load unit, the selection of the motor 20 is freer, which saves the motor cost and is not easy to wear.

[0034] In some embodiments, Figure 1 and Figure 6As shown, it includes a maintenance limit mechanism. The maintenance limit mechanism is used to prevent the maintenance personnel from being injured by accidental startup of the motor 20 during the maintenance process by physical means when the hoist is being maintained. The maintenance limit mechanism includes a limit plate 22, a positioning latch 23 and a latch seat 24. The limit plate 22 is arranged at one end of the drive shaft 21, and can be specifically arranged at the end of the drive shaft 21 away from the motor 20. The limit plate 22 rotates coaxially with the drive shaft 21. A limiting hole is provided at the eccentric position of the limit plate 22. One limiting hole can be provided, or multiple limiting holes can be provided along the circumferential direction. The latch seat 24 is fixedly provided at the corresponding position of the profile frame 1. The latch seat 24 has a latch hole. When the positioning latch 23 passes through the latch hole and the limiting hole at the same time, the limit plate 22 and the latch seat 24 are relatively fixed, that is, the drive shaft 21 and the profile frame 1 are relatively fixed, and the drive shaft 21 cannot rotate, thereby avoiding the risk of personnel operation caused by accidental startup of the motor 20 in the maintenance state.

[0035] In some embodiments, a safety clamp assembly 25 may be disposed on the second side of the profile frame to prevent the load unit from falling abnormally. The safety clamp assembly is a conventional commercially available part and is not limited here.

[0036] In some embodiments, Figures 1 to 3 As shown, two first slide rails 26 opposite to each other and perpendicular to the ground are provided on the first side of the profile frame 1, and sliders 27 are provided on both sides of the counterweight frame 13. The sliders 27 cooperate with the first slide rails 26, so that the counterweight frame 13 moves up and down in the profile frame 1.

[0037] In some embodiments, Figures 1 to 3 As shown, a second slide rail 28 perpendicular to the ground is further provided on the second side of the profile frame 1, and a guide shoe 29 is provided on the side of the load frame 2 opposite to the second slide rail 28. The guide shoe 29 is cooperatively connected with the second slide rail 28. The load frame 2 completes the up and down displacement in the profile frame 1 under the guidance of the second slide rail 28.

[0038] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A chain hoist with adjustable counterweight, characterized in that: It includes a driving unit, a load unit, a counterweight unit, a frame unit and a chain. The driving unit drives the load unit and the counterweight unit to move up and down in the frame unit through the chain. The load unit and the counterweight unit are connected through the chain and have relative and opposite movement trends to each other. The weight of the counterweight unit can be adaptively adjusted according to the weight of the load unit.

2. The chain hoist according to claim 1, characterized in that: A first double-row sprocket is provided at the upper end of the first side of the frame unit, and a first single-row sprocket is provided at the upper end of the second side of the frame unit, the first side and the second side are opposite sides, the chain includes a first chain and a second chain, one end of the first chain is connected to the upper end of the counterweight unit, the other end of the first chain is connected to the load unit near the upper end of the second side after passing through the first double-row sprocket and the first single-row sprocket, one end of the second chain is connected to the upper end of the counterweight unit, the other end of the second chain is connected to the load unit near the upper end of the first side after passing through the first double-row sprocket, and the driving unit drives the first double-row sprocket to rotate.

3. The chain hoist according to claim 2, characterized in that: A second double-row sprocket is provided at the lower end of the first side of the frame unit, and a second single-row sprocket is provided at the lower end of the second side of the frame unit. The chain also includes a third chain and a fourth chain. One end of the third chain is connected to the lower end of the counterweight unit, and the other end of the third chain is connected to the load unit near the lower end of the second side after passing through the second double-row sprocket and the second single-row sprocket. One end of the fourth chain is connected to the lower end of the counterweight unit, and the other end of the fourth chain is connected to the load unit near the lower end of the first side after passing through the second double-row sprocket.

4. The chain hoist according to claim 3, characterized in that: The counterweight unit includes a manual counterweight mechanism, which includes a counterweight frame and a counterweight plate. The counterweight frame has a horizontally open accommodating portion, and a plurality of counterweight plates can be stacked in the accommodating portion. The number of the counterweight plates is positively correlated with the weight of the load unit.

5. The chain hoist according to claim 4, characterized in that: One side of the weight plate has a notch portion, and when a plurality of the weight plates are stacked on the accommodating portion, adjacent stacked notches are stacked in an offset manner in a vertical direction.

6. The chain hoist according to claim 4, characterized in that: The counterweight unit also includes an electrically controlled counterweight mechanism, which includes a first electromagnet, a second electromagnet and a supplementary counterweight block. The first electromagnet is arranged at the lower end of the counterweight frame, and the second electromagnet is arranged at the lower end of the first side of the frame unit. The supplementary counterweight block is adsorbed on the first electromagnet or the second electromagnet according to the power supply status of the first electromagnet and the second electromagnet.

7. The chain hoist according to claim 6, characterized in that: The drive shaft is transmission-connected to the first double-row sprocket in a horizontal direction, and the motor is transmission-connected to the drive shaft.

8. The chain hoist according to claim 7, characterized in that: It also includes a maintenance limit mechanism, which includes a limit plate, a positioning pin and a pin seat. The limit plate is arranged at one end of the drive shaft and rotates coaxially with the drive shaft. A limit hole is provided at an eccentric position of the limit plate. The pin seat is arranged on the frame unit. The positioning pin can be inserted into the pin seat and pass through the limit hole, thereby limiting the rotation of the drive shaft.

9. The chain hoist according to claim 2, characterized in that: The first side of the frame unit is provided with a first slide rail in a vertical direction, and the counterweight unit is connected with the first slide rail and is arranged on the first side of the frame unit.

10. The chain hoist according to claim 2, characterized in that: The frame unit is provided with a second slide rail in a vertical direction, and the load unit is arranged in the frame unit in cooperation with the second slide rail.

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