Automatic positioning mechanism and positioning method for a suspended scale pan

Abstract

The present application relates to a kind of automatic positioning mechanism and positioning method of suspension scale, including rotary positioning mechanism, linear positioning mechanism, electric push rod, cable mechanism, rotary positioning mechanism, linear positioning mechanism are respectively installed on the two sides of suspension scale upper, and are connected electric push rod, cable mechanism;Two positioning plates in rotary positioning mechanism and positioning frame in linear positioning mechanism are evenly distributed at three points of suspension scale circumference, and electric push rod, cable mechanism are driven positioning frame and two positioning plates by cable, and generate same direction movement, and produce positioning or reverse disengagement positioning to suspension scale.The present application has the characteristics of automatic three-point simultaneous circumferential positioning, disengagement positioning to suspension scale, when mechanical hand exchanges weight, can keep the center of scale stable unchanged, and the mechanism has compact structure, repeat positioning accurate, high reliability specific, and can solve the difficult problem that mechanical hand automatically exchanges weight in balance, comparison instrument suspension scale, provide an effective solution for such instrument.

Description

Technical Field

[0001] This invention relates to a suspended weighing pan, and more particularly to an automatic positioning mechanism and method for a suspended weighing pan. Background Technology

[0002] Currently, suspended weighing pans are widely used as weight-bearing devices in balances and mass comparators. The centering accuracy of the weights on the weighing pan directly affects the measurement accuracy. When manually exchanging weights, the initial positional error of the weighing pan's center is largely unaffected by human visual searching. However, when exchanging weights using a computer program, the robotic arm system cannot recognize the centering error of the weighing pan. This can lead to minor issues like center deviation after weight positioning, affecting the instrument's high-precision measurement; or even serious issues like interference and collision between the robotic arm and weighing pan components, damaging the instrument. Therefore, an effective solution is needed to address these issues. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the problems existing in the prior art and provide an automatic positioning mechanism and positioning method for a suspended weighing pan, which is mainly used in balances and mass comparators to ensure their reliable, simple and high-precision operation.

[0004] To solve the above problems, the technical solution of the present invention is as follows:

[0005] An automatic positioning mechanism for a suspended weighing pan includes a rotary positioning mechanism, a linear positioning mechanism, an electric push rod, and a cable mechanism. The rotary positioning mechanism and the linear positioning mechanism are respectively installed on both sides of the suspended weighing pan and connected to the electric push rod and the cable mechanism. The two positioning plates in the rotary positioning mechanism and the positioning frame in the linear positioning mechanism are evenly distributed at three points around the circumference of the suspended weighing pan. The electric push rod and the cable mechanism drive the positioning frame and the two positioning plates to move in the same direction through the cable, which is used to position the suspended weighing pan or to disengage it from the positioning in the opposite direction.

[0006] Furthermore, the rotary positioning mechanism includes a roller seat, a positioning rod, a positioning plate, a cable pressure plate, and a drive seat. Two drive seats are respectively mounted on the bottom plate of the roller seat and are slidably connected by a protrusion at the bottom and a groove on the bottom plate. The rear end of the positioning rod is connected to an inclined groove arranged in the drive seat by a pin, and the positioning rod is hinged to the roller seat by a pin shaft, allowing the positioning rod to rotate around the pin shaft. The positioning plate is mounted on the front end of the positioning rod. The drive seat is connected to the electric push rod and the cable in the cable mechanism by the cable pressure plate and moves. By moving the pin in the inclined groove of the drive seat, the positioning rod and the positioning plate are rotated, causing them to disengage from or contact the suspended weighing pan.

[0007] Furthermore, the positioning plate is adjustable in position at the front and rear of the positioning rod to control its original position relative to the suspended weighing pan.

[0008] Furthermore, the linear positioning mechanism includes a drive seat, a pin, a guide plate, a positioning frame, a cable pressure plate, and a roller frame. The drive seat is mounted on the base plate of the roller frame and is slidably connected to the groove on the base plate via a protrusion at the bottom. The guide plate is positioned above the drive seat and is slidably connected to the vertical guide grooves on the roller frame on both sides. The positioning frame is mounted on the top of the guide plate, and the bottom is connected to the inclined groove arranged inside the drive seat via the pin. The drive seat moves via a cable connection to the cable pressure plate. The movement of the pin in the inclined groove of the linear drive seat drives the guide plate and the positioning frame to move radially along the suspended weighing pan, which can cause them to disengage or come into contact with the suspended weighing pan.

[0009] Furthermore, the position of the positioning frame on the guide plate is adjustable to control its original position relative to the suspended weighing pan.

[0010] Furthermore, the electric push rod and cable mechanism includes a push rod bracket, an electric push rod, a push rod connecting fork, rollers, a vertical roller frame, a roller frame, a roller seat, a tension spring frame, a tension spring hook, a tension spring, and a cable. The front end of the cable is connected to the electric push rod through the push rod connecting fork, and the rear end is connected to the tension spring. The tension spring is connected to the tension spring frame through the tension spring hook. The rollers are distributed on the upper and lower ends of the vertical roller frame, the front end of the roller frame, and both ends of the roller seat. The cable connects five rollers to form a drive guide circuit.

[0011] Furthermore, the tension of the cable is generated by a tension spring, and through its combined action with the electric push rod, it positions the three drive seats to generate bidirectional movement.

[0012] An automatic positioning method for a suspended weighing pan, employing an automatic positioning mechanism for the suspended weighing pan, specifically includes the following steps:

[0013] The first step involves the electric push rod being controlled by the electronic control system to generate axial retraction motion, which in turn drives the cable to retract. Its initial preload is controlled by the tension spring.

[0014] The second step involves the cable being guided by rollers, roller seats, and roller frames, resulting in a change in the direction of spatial motion.

[0015] The third step involves the cable driving the drive seat, guide plate, and positioning plate and positioning frame to move radially.

[0016] The fourth step involves the positioning plate, positioning frame, and three other points contacting the suspended weighing pan to achieve positioning and ensure the accurate placement of the suspended weighing pan and weights.

[0017] The fifth step involves the robotic arm taking out and then placing the weights.

[0018] Step 6: The electric push rod is controlled by the electronic control system to generate an axial outward movement, and the cable generates a forward movement through the action of the tension spring;

[0019] Step 7: The cable drives the drive seat, guide plate, and positioning plate and positioning frame above to move radially backward.

[0020] Step 8: Automatic positioning ends. The positioning plate and positioning frame retract and disengage from the suspended weighing pan. The suspended weighing pan and weights are in a natural hanging state, and the subsequent measurement process can be completed.

[0021] The beneficial effects of this invention are as follows: By employing the above-mentioned mechanism and positioning method, this invention achieves the following objectives:

[0022] 1) By synchronously driving the positioning point through the cable, the positioning of the suspended weighing pan is ensured to be accurate, avoiding the occurrence of center deviation, ensuring the accurate positioning of the weights on it, facilitating the smooth loading and unloading of the automatic robotic arm, and completing the high-precision measurement of the instrument; and preventing interference and collision with adjacent components, which could damage the instrument.

[0023] 2) The mechanism occupies little space, making it suitable for situations where the space for a balance or comparator is limited.

[0024] 3) The mechanism uses cables to ensure flexible contact and positioning with the weighing pan, avoiding interference from rigid contact with the instrument.

[0025] Therefore, this invention can solve the problem of unstable center of the suspended weighing pan in balances and comparators, providing an effective solution for the automatic delivery of weights for such instruments. Attached Figure Description

[0026] Figure 1 This is a diagram showing the composition of the rotary positioning mechanism of the present invention;

[0027] Figure 2 This is a diagram showing the composition of the linear positioning mechanism of the present invention;

[0028] Figure 3 This is a schematic diagram of the electric push rod and cable assembly of the present invention;

[0029] Figure 4 This is an overall positioning structure diagram of the automatic positioning mechanism of the present invention. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0031] like Figures 1 to 4 As shown, an automatic positioning mechanism for a suspended weighing pan according to the present invention includes a rotary positioning mechanism 1, a linear positioning mechanism 2, an electric push rod, and a cable mechanism 3. The rotary positioning mechanism 1 and the linear positioning mechanism 2 are respectively installed on both sides of the suspended weighing pan and connected to the electric push rod and the cable mechanism 3.

[0032] like Figure 1As shown, a rotary positioning mechanism 1 in this embodiment includes a roller seat 1-1, a pin 1-2, a positioning rod 1-3, a positioning plate 1-4, a cable pressure plate 1-5, a drive seat 1-6, and a lever pin 1-8.

[0033] Two drive seats 1-6 are respectively installed on both ends of the base plate of roller seat 1-1, and are slidably connected by the bottom protrusion and the groove on the base plate. The positioning plate 1-4 is installed on the positioning rod 1-3, the pin 1-2 is installed on the roller seat 1-1, and the pin 1-8 is installed on the positioning rod 1-3. The positioning rod 1-3 can rotate around the pin 1-2. The drive seat 1-6 is arranged with an inclined groove, and the pin 1-8 is connected in the inclined groove. The drive seat 1-6 is connected to the electric push rod and the cable 3-11 in the cable mechanism 3 through the cable pressure plate 1-5. By moving the pin 1-8 in the inclined groove of the drive seat 1-6, the positioning rod 1-3 and the positioning plate 1-4 are driven to rotate, which can cause them to disengage or contact the suspended weighing pan 4.

[0034] The original position of the positioning plate 1-4 relative to the suspended weighing pan 4 can be controlled by adjusting the positioning plate 1-4. The position of the positioning plate 1-4 on the positioning rod 1-3 is adjustable.

[0035] like Figure 2 As shown, a linear positioning mechanism 2 in this embodiment includes a linear drive seat 2-1, a pin 2-2, a guide plate 2-3, a positioning frame 2-4, a cable pressure plate 2-6, and a roller frame 2-7. The linear drive seat 2-1 is mounted on the base plate of the roller frame 2-7 and is slidably connected to the groove on the base plate via a protrusion at the bottom. The guide plate 3 is positioned above the linear drive seat 2-1 and is slidably connected to the vertical guide grooves on the base plate on both sides. The positioning frame 2-4 is mounted on the guide plate 3, and the bottom is connected to the inclined groove arranged in the linear drive seat 2-1 via the pin 2-2. The linear drive seat 2-1 is connected to the cable 3-11 via the cable pressure plate 2-6 and moves. The movement of the pin 2-2 in the inclined groove of the linear drive seat 2-1 drives the guide plate 2-3 and the positioning frame 2-4 to move radially along the suspended weighing pan, which can disengage from or contact the suspended weighing pan.

[0036] The original position of the positioning frame 2-4 relative to the suspended weighing pan 4 can be controlled by adjusting the positioning frame 2-4.

[0037] like Figure 3 As shown, an electric push rod and cable mechanism 3 of this embodiment includes a push rod bracket 3-1, an electric push rod 3-2, a push rod connecting fork 3-3, a roller 3-4, a vertical roller frame 3-5, a roller seat 1-1, a roller frame 2-7, a tension spring frame 3-8, a tension spring hook 3-9, a tension spring 3-10, and a cable 3-11.

[0038] The front end of the cable 3-11 is connected to the electric push rod 3-2 via the push rod connecting fork 3-3, and the rear end is connected to the tension spring 3-10. The tension spring 3-10 is connected to the tension spring frame 3-8 via the tension spring hook 3-9. The rollers 3-4 are distributed on the upper and lower ends of the vertical roller frame 3-5, the front end of the roller frame 2-7, and both ends of the roller seat 1-1. The cable 3-11 connects the five rollers 3-4 to form a drive guide circuit, and the spatial distribution changes.

[0039] The tension of cable 3-11 is generated by tension spring 3-10, and through its combined action with electric push rod 3-2, it can position three drive seats to generate bidirectional movement.

[0040] like Figure 4 As shown, an overall positioning structure in this embodiment includes a positioning frame 2-4, two positioning plates 1-4, and a suspended weighing pan 4.

[0041] Positioning frame 2-4 and two positioning plates 1-4 are evenly distributed at three points around the circumference of the suspended weighing pan 4. Through the action of cable 3-11, positioning frame 2-4 and two positioning plates 1-4 move in the same direction to position the suspended weighing pan 4, and can also move away from the positioning in the opposite direction.

[0042] A positioning method using an automatic positioning mechanism for a suspended weighing pan specifically includes the following steps:

[0043] The first step involves the electric push rod being controlled by the electronic control system to generate axial retraction motion, which in turn drives the cable to retract. Its initial preload is controlled by the tension spring.

[0044] The second step involves the cable being guided by rollers and roller seats (frames), resulting in a change in the direction of spatial movement;

[0045] The third step involves the cable driving the drive seat, guide plate, and positioning plate and positioning frame to move radially.

[0046] The fourth step involves the two positioning plates and the positioning frame contacting the suspended weighing pan at three points to achieve positioning and ensure the accurate position of the weighing pan and weights.

[0047] The fifth step involves the robotic arm taking out and then placing the weights.

[0048] Step 6: The electric push rod is controlled by the electronic control system to generate an axial outward movement, and the cable generates a forward movement through the action of the tension spring;

[0049] Step 7: The cable drives the drive seat, guide plate, and positioning plate and positioning frame above to move radially backward.

[0050] Step 8: Automatic positioning ends. The two positioning plates and positioning frame retract and disengage from the suspended weighing pan. The suspended weighing pan and weights are in a natural hanging state, and the subsequent measurement process can be completed.

[0051] 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 this invention is defined by the appended claims and their equivalents.

Claims

1. An automatic positioning mechanism for a suspended weighing pan, characterized in that: The system includes a rotary positioning mechanism, a linear positioning mechanism, an electric push rod, and a cable mechanism. The rotary and linear positioning mechanisms are respectively installed on both sides of the suspended weighing pan and connected to the electric push rod and cable mechanism. The two positioning plates in the rotary positioning mechanism and the positioning frame in the linear positioning mechanism are evenly distributed at three points around the circumference of the suspended weighing pan. The electric push rod and cable mechanism drive the positioning frame and the two positioning plates to move in the same direction via the cable, which is used to position the suspended weighing pan or disengage it from the positioning. The rotary positioning mechanism includes a roller seat, a positioning rod, a positioning plate, a cable pressure plate, and a drive seat. The two drive seats are respectively installed on the bottom plate of the roller seat and are slidably connected by a protrusion at the bottom and a groove on the bottom plate. The rear end of the positioning rod is connected to an inclined groove arranged in the drive seat by a pin, and the positioning rod is hinged to the roller seat by a pin, allowing the positioning rod to rotate around the pin. A positioning plate is installed at the front end of the positioning rod. The drive seat is connected to the electric push rod and the cable in the cable mechanism via a cable pressure plate. The movement of the pin in the inclined groove of the drive seat drives the positioning rod and positioning plate to rotate, causing them to disengage or contact the suspended weighing pan. The linear positioning mechanism includes a drive seat, a pin, a guide plate, a positioning frame, a cable pressure plate, and a roller frame. The drive seat is installed on the bottom plate of the roller frame and is slidably connected to the groove on the bottom plate via a convex groove. The guide plate is located above the drive seat and is slidably connected to the vertical guide grooves on the roller frame on both sides. The positioning frame is installed on the top of the guide plate and is connected to the inclined groove in the drive seat via a pin. The drive seat is connected to the cable via a cable pressure plate. The movement of the pin in the inclined groove of the linear drive seat drives the guide plate and positioning frame to move radially along the suspended weighing pan, causing them to disengage or contact the suspended weighing pan.

2. The automatic positioning mechanism for the suspended weighing pan according to claim 1, characterized in that: The positioning plate is adjustable in position at the front and rear of the positioning rod, and is used to control its original position relative to the suspended weighing pan.

3. The automatic positioning mechanism for the suspended weighing pan according to claim 1, characterized in that: The position of the positioning frame on the guide plate is adjustable, which is used to control its original position relative to the suspended weighing pan.

4. The automatic positioning mechanism for the suspended weighing pan according to claim 1, characterized in that: The electric push rod and cable mechanism includes a push rod bracket, an electric push rod, a push rod connecting fork, rollers, a vertical roller frame, a roller frame, a roller seat, a tension spring frame, a tension spring hook, a tension spring, and a cable. The front end of the cable is connected to the electric push rod through the push rod connecting fork, and the rear end is connected to the tension spring. The tension spring is connected to the tension spring frame through the tension spring hook. The rollers are distributed on the upper and lower ends of the vertical roller frame, the front end of the roller frame, and both ends of the roller seat. The cable connects five rollers to form a drive guide circuit.

5. The automatic positioning mechanism for the suspended weighing pan according to claim 4, characterized in that: The tension of the cable is generated by a tension spring, and through its combined action with an electric push rod, it positions the three drive seats to generate bidirectional movement.

6. A method for automatically positioning a suspended weighing pan, employing the automatic positioning mechanism for a suspended weighing pan as described in any one of claims 1-5, characterized in that, Specifically, the following steps are included: The first step involves the electric push rod being controlled by the electronic control system to generate axial retraction motion, which in turn drives the cable to retract. Its initial preload is controlled by the tension spring. The second step involves the cable being guided by rollers, roller seats, and roller frames, resulting in a change in the direction of spatial motion. The third step involves the cable driving the drive seat, guide plate, and positioning plate and positioning frame to move radially. The fourth step involves the positioning plate, positioning frame, and three other points contacting the suspended weighing pan to achieve positioning and ensure the accurate placement of the suspended weighing pan and weights. The fifth step involves the robotic arm taking out and then placing the weights. Step 6: The electric push rod is controlled by the electronic control system to generate an axial outward movement, and the cable generates a forward movement through the action of the tension spring; Step 7: The cable drives the drive seat, guide plate, and positioning plate and positioning frame above to move radially backward. Step 8: Automatic positioning ends. The positioning plate and positioning frame retract and disengage from the suspended weighing pan. The suspended weighing pan and weights are in a natural hanging state, and the subsequent measurement process can be completed.

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