CN114572870A - Counterweight device capable of accurately balancing weight and eliminating noise during counterweight and manufacturing method thereof - Google Patents

Abstract

The invention relates to the technical field of lifting equipment, in particular to a counterweight device capable of accurately counterbalancing and eliminating noise during counterweighting and a manufacturing method thereof, comprising a frame on which supporting devices are sequentially arranged from left to right , Counterweight device, water tank, hoisting device, a cab is installed on the frame and located at one end of the hoisting device, a turntable is installed on the lower surface of the frame, and a roller is installed on the lower surface of the turntable. The device is slidably arranged on the rack, and the counterweight device is communicated with the water tank through a water pipe. The water tank is fixed on the rack and the water tank is used to provide a water source for the counterweight device. The hoisting device includes a hoisting frame fixed on the frame. A hoisting hook is installed on the hoisting hook, and the counterweight device includes a frame body fixed on the frame. The present application solves the problem that when the existing hoisting equipment is counterweight, the sound produced by the counterweight is too large, and accurate counterweight cannot be performed. , The problem that the lifting equipment is not stable enough during the lifting operation.

Description

A counterweight device capable of accurately counterbalancing and eliminating noise during counterweight and its manufacturing method

technical field

The invention relates to the technical field of hoisting equipment, and in particular, to a counterweight device capable of accurately counterbalancing and eliminating noise during counterweighting and a manufacturing method thereof.

Background technique

The boom structure of the crane is divided into a lattice boom and a box-shaped telescopic boom. The lattice jib boom is mainly used in crawler cranes and ring rail cranes. Its advantages are simple structure, large lifting capacity, small grounding and easy maintenance. When the existing lifting equipment is balancing the weight, the sound produced by the weight is too large, and the accurate weighting cannot be carried out. In addition, the lifting equipment is not stable enough during the lifting operation. In order to solve the above problems, we provide A counterweight device capable of accurately counterbalancing and eliminating noise during counterweight and a manufacturing method thereof are provided.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

To solve the problem that the existing hoisting equipment produces too much sound when balancing the weight, and cannot perform accurate balancing, and in addition, the hoisting equipment is not stable enough during the lifting operation, and provides a A counterweight device capable of accurately counterbalancing weights and eliminating noise during counterweighting and a manufacturing method thereof.

(2) Technical solutions

A counterweight device capable of accurately counterbalancing weights and eliminating noise during counterweighting includes a frame, and a support device, a counterweight device, a water tank, and a hoisting device are sequentially arranged on the frame from left to right. One end of the hoisting device is installed with a cab, the lower surface of the frame is rotatably installed with a turntable, the lower surface of the turntable is installed with rollers, and the roller jacket is provided with crawler tracks, and the counterweight device is slidably arranged on the frame, and the counterweight device is connected to the frame. The water tank is communicated through a water pipe, the water tank is fixed on the frame, and the water tank is used to provide a water source for the counterweight device. The lifting device includes a lifting frame fixed on the frame, and a lifting hook is installed on the lifting frame.

As a preferred technical solution, the counterweight device includes a frame body fixed on the frame body, a plurality of rollers are arranged on the frame body and in sequence along the length direction of the frame body, and horizontally arranged on the frame body and on both sides of the frame body The sliding rod is slidably provided with a bottom plate, the lower surface of the bottom plate is in close contact with the rollers, a pair of uprights are vertically fixed on the bottom plate, a plurality of counterweight blocks are sleeved on the uprights, the interior of the uprights is hollow, and the uprights and The water tanks are connected to each other through water pipes.

As a preferred technical solution, a connecting block is fixed on the lower surface of the bottom plate, one of the sliding rods is formed with threads, one of the connecting blocks is screwed with the sliding rod, the other connecting block is connected with the sliding rod socket, and the sliding rod The upper and both sides of the bottom plate are sleeved with springs, one end of the threaded sliding rod is installed with a first runner, a motor is fixed on the frame, the output shaft end of the motor is fixed with a second runner, and the first runner is It is connected with the second runner by a belt.

As a preferred technical solution, the support device includes a bracket fixed on one end of the frame, both ends of the bracket are vertically provided with a first hydraulic cylinder, and a second hydraulic cylinder is inclined inside the bracket. The first hydraulic cylinder and the second hydraulic cylinder They are all rotatably installed on the frame, and the output shaft end of the second hydraulic cylinder is hinged with the cylinder wall of the first hydraulic cylinder. The cylinder wall of the first hydraulic cylinder is also installed with a universal joint, and the end of the universal joint is provided with a universal joint. The locking mechanism is used to fix the universal joint with the frame.

As a preferred technical solution, the locking mechanism includes a sliding block fixed on the end of the universal joint, a sliding groove is opened on the lower surface of the frame, the sliding block is embedded in the sliding groove, and a plug is inserted and sleeved on the sliding block, and the plug A reset spring is installed on the plug, a reset spring is installed on the plug, a plurality of slots are opened on the chute and along the length direction of the chute, and the plug is embedded in the slot.

As a preferred technical solution, a water pipe arrangement frame is horizontally fixed on the side wall of the rack, an arrangement slot is opened on the water pipe arrangement frame, a plurality of arrangement sleeves are installed on the water pipe, and a clamping block is fixed on each arrangement sleeve. Embedded in the sorting slot.

As a preferred technical solution, a water pump is installed on the top of the water tank, and the water pipe is fixedly connected with the water pump.

A manufacturing method for forming a counterweight device is based on a counterweight device capable of accurately balancing weights and eliminating noise when balancing weights.

(3) Beneficial effects

The beneficial effects of the present invention are:

(1) The worker enters the cab and drives the device to the designated position. When the device is opened to the designated position, the second hydraulic cylinder is activated to retract the output shaft of the second hydraulic cylinder. Both the two hydraulic cylinders are rotatably mounted on the frame, and the output shaft end of the second hydraulic cylinder is hinged with the cylinder wall of the first hydraulic cylinder, so that the retraction of the output shaft of the second hydraulic cylinder drives the first hydraulic cylinder to rotate clockwise, Turn until the first hydraulic cylinder is perpendicular to the ground, then start the first hydraulic cylinder, and the first hydraulic cylinder can move downward until it contacts the ground. The frame is fixed by setting the first hydraulic cylinder and the second hydraulic cylinder to prevent Its movement affects the hoisting operation. When hoisting, a hoisting hook is installed on the hoisting frame, and the hoisting hook can be hooked to the heavy object for hoisting. When hoisting, a counterweight is required. A counterweight, further, when the weight is too heavy, the water in the water tank is transported to the interior of the column through the water pump, and the interior of the column is hollow, so the appropriate water can be transported according to the weight of the weight, and the water can be distributed through the water. It can not only accurately balance the weight, but also eliminate the noise caused by the lifting of the counterweight when the counterweight is lifted, saving time and effort.

(2) A connecting block is fixed on the lower surface of the bottom plate, one of the sliding rods is formed with threads, one of the connecting blocks is screwed with the sliding rod, the other connecting block is connected with the sliding rod socket, and the sliding rod is located on the sliding rod. Both sides of the bottom plate are sleeved with springs, one end of the threaded sliding rod is installed with a first runner, a motor is fixed on the frame, and a second runner is fixed at the output shaft end of the motor. The runner is connected by the belt, start the motor, the motor rotates to drive the second runner to rotate, the first runner and the second runner are connected by the belt, the second runner rotates to drive the first runner to rotate, and the first runner rotates to drive the molding The threaded sliding rod rotates, a connecting block is fixed on the lower surface of the bottom plate, one of the sliding rods is formed with threads, one of the connecting blocks is screwed with the sliding rod, and the other connecting block is connected with the sliding rod socket, driving the The bottom plate slides horizontally on the left and right sides of the sliding rod, thereby driving the column and the counterweight to slide back and forth horizontally on the sliding rod. The lower surface of the bottom plate is in close contact with the rollers. The bottom plate can slide smoothly. When the column and the counterweight block slide to the leftmost position, they reach the maximum value of the counterweight. When the column and the counterweight block slide to the rightmost position, they reach the minimum value of the counterweight, so It can slide freely according to the lifted weight, so as to achieve the effect of counterweight.

(3) When the lifting operation is completed, the first hydraulic cylinder rotates counterclockwise and starts to reset and leaves the ground. At this time, the first hydraulic cylinder drives the slider to slide in the chute. When the first hydraulic cylinder is reset, pull the plug to remove the plug. It is embedded in the slot to fix the first hydraulic cylinder and prevent the first hydraulic cylinder from shaking after reset.

(4) The present application solves the problem that when the existing lifting equipment is counterweight, the sound produced by the counterweight is too loud, and the counterweight cannot be accurately counterbalanced. In addition, the lifting equipment is not stable enough during the lifting operation. question.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the structural representation of the present invention;

Fig. 2 is a partial enlarged view of Fig. 1A;

Fig. 3 is a partial enlarged view of part B of Fig. 1;

Fig. 4 is the structural representation of the support device of the present invention;

Fig. 5 is the structural representation of the locking mechanism of the present invention;

1-frame; 2-support device; 3-counterweight device; 4-water tank; 5-hoisting device; 6-cab; 7-turntable; 8-roller; 9-crawler; 10-water pipe; 11-hoisting frame ;12-lifting hook;13-frame body;14-roller;15-slide rod;16-bottom plate;17-column;18-counterweight block;19-spring;20-motor;21-first hydraulic cylinder; 22-Second hydraulic cylinder; 23-Universal joint; 24-Slider; 25-Chute; 26-Plug; 27-Water pipe finishing frame; 28-Organizing groove; 29-Organizing sleeve; water pump; 32-slot;

Detailed ways

A kind of counterweight device and its manufacturing method which can accurately counterweight and eliminate noise when counterweight of the present invention will be further described with reference to the accompanying drawings, and the present invention will be further described in detail below in conjunction with the embodiments:

A counterweight device capable of accurately counterbalancing weights and eliminating noise during counterweighting includes a frame 1, and the frame 1 is provided with a support device 2, a counterweight device 3, a water tank 4, and a hoisting device 5 sequentially from left to right. , a cab 6 is installed on the frame 1 and is located at one end of the hoisting device 5, a turntable 7 is installed on the lower surface of the frame 1, and a roller 8 is installed on the lower surface of the turntable 7. The device 3 is slidably arranged on the rack 1, and the counterweight device 3 is communicated with the water tank 4 through a water pipe 10. The water tank 4 is fixed on the rack 1 and the water tank 4 is used to provide a water source for the counterweight device 3. The lifting device 5 includes A hoisting frame 11 is fixed to the rack 1 , and a hoisting hook 12 is installed on the hoisting frame 11 .

Further, the counterweight device 3 includes a frame body 13 fixed on the frame body 1 , and a plurality of rollers 14 are arranged on the frame body 13 and along the length direction of the frame body 13 in sequence. A sliding bar 15 is arranged horizontally on the side, and a bottom plate 16 is slidably arranged on the sliding bar 15. The lower surface of the bottom plate 16 is in close contact with the roller 14. The purpose of the roller 14 is to reduce the friction force generated by the bottom plate 16 on the sliding bar 15. , so that the bottom plate 16 can slide smoothly, a pair of uprights 17 are vertically fixed on the bottom plate 16, a plurality of counterweight blocks 18 are sleeved on the uprights 17, the interior of the uprights 17 is hollow, and the uprights 17 and the water tank 4 communicate with each other through the water pipe 10 , When hoisting, a plurality of counterweight blocks 18 are sequentially set on the column 17 according to the lifted heavy object. Further, when the heavy object is too heavy, the water in the water tank 4 is transported to the interior of the column 17 through the water pump 31, and the column 17 The interior is hollow, so appropriate water can be delivered according to the weight of the heavy object, and the water can be used to balance the weight. save time and energy.

Further, a connecting block is fixed on the lower surface of the bottom plate 16, a thread is formed on one of the sliding rods 15, one of the connecting blocks is screwed with the sliding rod 15, and the other connecting block is connected with the sliding rod 15 by inserting a sleeve, and the sliding Springs 19 are sleeved on the rod 15 and located on both sides of the bottom plate 16, a first runner is installed at one end of the threaded sliding rod 15, a motor 20 is fixed on the frame 1, and the output shaft end of the motor 20 is fixed with a first wheel. Two runners, the first runner and the second runner are connected by a belt, start the motor 20, the motor 20 rotates to drive the second runner to rotate, the first runner and the second runner are connected by a belt, and the second runner rotates to drive The first runner rotates, and the first runner rotates to drive the threaded sliding rod 15 to rotate. The lower surface of the bottom plate 16 is fixed with a connecting block, and one of the sliding rods 15 is threaded, and one of the connecting blocks is connected to the sliding rod. The rod 15 is screwed, and the other connecting block is connected with the sliding rod 15 by inserting a sleeve, which drives the bottom plate 16 to slide horizontally on the left and right of the sliding rod 15, thereby driving the column 17 and the counterweight 18 to slide back and forth horizontally on the sliding rod 15. When the weight block 18 slides to the leftmost position, it reaches the maximum value of the counterweight. When the column 17 and the counterweight block 18 slide to the rightmost position, it reaches the minimum value of the counterweight, so it can be adjusted according to the lifting weight. Sliding freely to achieve the effect of counterweight.

Further, the support device 2 includes a bracket fixed on one end of the frame 1 , both ends of the bracket are provided with a first hydraulic cylinder 21 vertically, and a second hydraulic cylinder 22 is obliquely arranged inside the bracket. The hydraulic cylinders 22 are all rotatably mounted on the frame 1, and the output shaft end of the second hydraulic cylinder 22 is hinged with the cylinder wall of the first hydraulic cylinder 21, and a universal joint 23 is also installed on the cylinder wall of the first hydraulic cylinder 21. The end of the joint 23 is provided with a locking mechanism, which is used to fix the universal joint 23 and the frame 1. When the device is opened to the designated position, the second hydraulic cylinder 22 is activated to make the second hydraulic pressure The output shaft of the cylinder 22 is retracted, the first hydraulic cylinder 21 and the second hydraulic cylinder 22 are both rotatably mounted on the frame 1, and the output shaft end of the second hydraulic cylinder 22 is hinged with the cylinder wall of the first hydraulic cylinder 21, thereby , the retraction of the output shaft of the second hydraulic cylinder 22 drives the first hydraulic cylinder 21 to rotate clockwise until the first hydraulic cylinder 21 is perpendicular to the ground. At this time, the first hydraulic cylinder 21 is activated and the first hydraulic cylinder 21 moves downward. The frame 1 is fixed by setting the first hydraulic cylinder 21 and the second hydraulic cylinder 22 until it is in contact with the ground, so as to prevent its movement from affecting the lifting operation.

Further, the locking mechanism includes a sliding block 24 fixed on the end of the universal joint 23, a sliding groove 25 is opened on the lower surface of the frame 1, the sliding block 24 is embedded in the sliding groove 25, and the sliding block 24 is sleeved. There is a plug 26, a return spring is installed on the plug 26, a return spring is installed on the plug 26, a plurality of slots 32 are opened on the chute 25 and along the length direction of the chute 25, the plug 26 is embedded in the slot, and when it is lifted After the operation is completed, the first hydraulic cylinder 21 rotates counterclockwise and starts to reset and leaves the ground. At this time, the first hydraulic cylinder 21 drives the slider 24 to slide in the chute 25. When the first hydraulic cylinder 21 is reset, pull the plug 26 to The plug 26 is embedded in the slot, so as to fix the first hydraulic cylinder 21 and prevent the first hydraulic cylinder 21 from shaking after being reset.

Further, a water pipe arrangement frame 27 is horizontally fixed on the side wall of the rack 1, an arrangement groove 28 is opened on the water pipe arrangement frame 27, a plurality of arrangement sleeves 29 are installed on the water pipe 10, and a card is fixed on each arrangement sleeve 29. The block 30 and the clamping block 30 are embedded in the arrangement groove 28 , and the water pipe 10 can be prevented from being disturbed during use by cooperating with the water pipe arrangement frame 27 , the arrangement groove 28 , the arrangement sleeve 29 and the clamping block 30 .

Further, a water pump 31 is installed on the top of the water tank 4 , and the water pipe 10 is fixedly connected to the water pump 31 .

A counterweight device capable of accurately balancing weights and eliminating noise when balancing weights is provided to form a manufacturing method of the counterweight device.

Working principle: The worker enters the cab 6 and drives the device to the designated position. When the device is opened to the designated position, the second hydraulic cylinder 22 is activated to retract the output shaft of the second hydraulic cylinder 22, and the first hydraulic The cylinder 21 and the second hydraulic cylinder 22 are both rotatably mounted on the frame 1, and the output shaft end of the second hydraulic cylinder 22 is hinged with the cylinder wall of the first hydraulic cylinder 21, so that the output shaft of the second hydraulic cylinder 22 retracts inward Drive the first hydraulic cylinder 21 to rotate clockwise until the first hydraulic cylinder 21 is perpendicular to the ground. At this time, the first hydraulic cylinder 21 is activated, and the first hydraulic cylinder 21 moves downward until it contacts the ground. By setting the first hydraulic cylinder 21 The hydraulic cylinder 21 and the second hydraulic cylinder 22 fix the frame 1 to prevent its movement from affecting the lifting operation. When lifting, a lifting hook 12 is installed on the lifting frame 11, and the lifting hook 12 is hooked to the heavy object for lifting. For counterweight, when lifting, a plurality of counterweight blocks 18 are sequentially set on the column 17 according to the lifted heavy objects. Further, when the heavy objects are too heavy, the water in the water tank 4 is transported to the interior of the column 17 through the water pump 31. , the interior of the upright column 17 is hollow, so appropriate water can be delivered according to the weight of the heavy object, and the water can be used to balance the weight, which not only can accurately balance the weight, but also eliminates the generation of the weight block 18 when the weight is lifted up and down. The lower surface of the bottom plate 16 is fixed with a connecting block, one of the sliding rods 15 is formed with threads, one of the connecting blocks is screwed with the sliding rod 15, and the other connecting block is inserted into the sliding rod 15. Sleeve connection, springs 19 are sleeved on the sliding rod 15 and located on both sides of the bottom plate 16, a first runner is installed at one end of the threaded sliding rod 15, a motor 20 is fixed on the frame 1, and the output shaft of the motor 20 is A second wheel is fixed at the end, the first wheel and the second wheel are connected by a belt, the motor 20 is started, and the motor 20 rotates to drive the second wheel to rotate, the first wheel and the second wheel are connected by a belt, and the second wheel is connected by a belt. The rotation of the runner drives the rotation of the first runner, the rotation of the first runner drives the rotation of the sliding rod 15 formed with threads, the lower surface of the bottom plate 16 is fixed with a connecting block, and one of the sliding rods 15 is formed with threads, and one of them The connecting block is screwed with the sliding rod 15, and the other connecting block is connected with the sliding rod 15 by inserting a sleeve, which drives the bottom plate 16 to slide horizontally on the left and right sides of the sliding rod 15, thereby driving the column 17 and the counterweight 18 to slide back and forth horizontally on the sliding rod 15, and the bottom plate 16 slides back and forth horizontally. The lower surface of 16 is in close contact with the roller 14. The purpose of the roller 14 is to reduce the frictional force generated by the bottom plate 16 on the sliding rod 15, so that the bottom plate 16 can slide smoothly. When the column 17 and the counterweight 18 slide to the far left When the position is in the upper right position, it reaches the maximum value of the counterweight. When the column 17 and the counterweight block 18 slide to the rightmost position, they reach the minimum value of the counterweight, so they can slide freely according to the lifted weight, so as to achieve Counterweight effect, when the lifting operation is completed, the first hydraulic cylinder 21 rotates counterclockwise and starts to reset and leaves the ground. At this time, the first hydraulic cylinder 21 drives the slider 24 to slide in the chute 25. When the first hydraulic cylinder 21 is reset Then, pull the plug 26 to embed the plug 26 in the slot, so as to fix the first hydraulic cylinder 21, To prevent the first hydraulic cylinder 21 from shaking after being reset, the present application solves the problem that when the existing lifting equipment is counterweight, the sound produced by the counterweight is too large, and accurate counterweight cannot be performed. , The problem that the lifting equipment is not stable enough.

The above examples are only to describe the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, those of ordinary skill in the art can Variations and improvements should all fall within the protection scope of the present invention, and the technical content claimed in the present invention has been fully recorded in the claims.

Claims (8)

1. The utility model provides a counter weight device of noise when can accurate counter weight and can eliminate counter weight, including frame (1), its characterized in that: the support device (2), the counterweight device (3), the water tank (4) and the lifting device (5) are sequentially arranged on the frame (1) from left to right, a cab (6) is arranged at one end of the frame (1) which is positioned on the hoisting device (5), a rotary table (7) is rotatably arranged on the lower surface of the rack (1), a roller (8) is arranged on the lower surface of the rotary table (7), a track (9) is sleeved outside the roller (8), the counterweight device (3) is slidably arranged on the rack (1), and the counterweight device (3) is communicated with the water tank (4) through a water pipe (10), the water tank (4) is fixed on the frame (1) and the water tank (4) is used for providing water source for the counterweight device (3), the lifting device (5) comprises a lifting frame (11) fixed on the rack (1), and a lifting hook (12) is installed on the lifting frame (11).

2. The counterweight device capable of accurately balancing weights and eliminating noise during counterweight according to claim 1, wherein: counterweight device (3) are including fixing support body (13) in frame (1), and on support body (13) and along support body (13) length direction set gradually a plurality of running rollers (14), the equal level in both sides that just are located support body (13) in frame (1) is provided with slide bar (15), and it is provided with bottom plate (16) to slide on slide bar (15), and the lower surface and running roller (14) of bottom plate (16) are hugged closely, and the vertical a pair of stand (17) that is fixed with on bottom plate (16), and the cover is equipped with a plurality of balancing weights (18) on stand (17), stand (17) inside is the cavity form, and stand (17) and water tank (4) communicate each other through water pipe (10).

3. The counterweight device capable of accurately balancing weights and eliminating noise during counterweight according to claim 2, wherein: the lower fixed surface of bottom plate (16) has the connecting block, wherein a slide bar (15) on the shaping have the screw thread, wherein a connecting block and slide bar (15) spiro union, another connecting block is connected with slide bar (15) plug bush, the both sides that just are located bottom plate (16) on slide bar (15) all are equipped with spring (19), first runner is installed to the one end of shaping screwed slide bar (15), be fixed with motor (20) on frame (1), motor (20) output shaft is fixed with the second runner, first runner passes through the belt with the second runner and is connected.

4. The counterweight device capable of accurately balancing weights and eliminating noise during counterweight according to claim 1, wherein: strutting arrangement (2) is including fixing the support in frame (1) one end, the equal vertical first pneumatic cylinder (21) that is provided with in both ends of support, the inside slope of support is provided with second pneumatic cylinder (22), first pneumatic cylinder (21), second pneumatic cylinder (22) are all rotated and are installed in frame (1), and second pneumatic cylinder (22) delivery shaft end and the jar wall of first pneumatic cylinder (21) are articulated, still install universal joint (23) on the jar wall of first pneumatic cylinder (21), the end department of universal joint (23) is provided with locking mechanism, and locking mechanism is used for fixing universal joint (23) and frame (1).

5. The counterweight device capable of accurately balancing weights and eliminating noise during counterweight according to claim 4, wherein: locking mechanism is including fixing slider (24) at universal joint (23) end, it has spout (25) to open on the lower surface of frame (1), slider (24) inlay and establish in spout (25), plug bush has plug (26) on slider (24), installs reset spring on plug (26), just seted up a plurality of slots (32) along spout (25) length direction on spout (25), plug (26) are inlayed and are established inside the slot.

6. The counterweight device capable of accurately balancing weights and eliminating noise during counterweight according to claim 2, wherein: the water pipe is fixed with water pipe arrangement frame (27) on the horizontal on the lateral wall of frame (1), has seted up arrangement groove (28) on water pipe arrangement frame (27), install a plurality of arrangement cover (29) on water pipe (10), all be fixed with fixture block (30) on every arrangement cover (29), fixture block (30) are inlayed and are established inside arrangement groove (28).

7. The counterweight device capable of accurately balancing weights and eliminating noise during counterweight according to claim 6, wherein: the water tank is characterized in that a water pump (31) is installed at the top of the water tank (4), and the water pipe (10) is fixedly connected with the water pump (31).

8. A method of manufacturing a counterweight device capable of accurately balancing a weight and eliminating noise at the time of balancing a weight according to claim 1.

Images