Frictionless weighing system

Abstract

This utility model relates to the field of pharmaceutical equipment and discloses a frictionless weighing system, comprising: a conveying device for conveying workpieces to be weighed; a gripper mechanism including at least a pair of grippers, wherein the gripping portion of the grippers is provided with a flexible contact portion adapted to the shape of the workpiece; a driving mechanism including a drive motor and a transmission assembly, wherein the transmission assembly is connected to the gripper mechanism to drive its horizontal movement; a weighing platform including a support column and a scale mounted on the top of the support column; and a lifting control mechanism including guide rails disposed on both sides of the movement path of the gripper mechanism, and a rolling component mounted on the gripper mounting platform and cooperating with the guide rails; wherein, when the drive motor drives the transmission assembly to move the gripper mechanism horizontally, the rolling component moves along the guide rails, forcing the gripper mounting platform to drive the grippers to rise or fall, thereby achieving frictionless placement and removal of the workpiece on the weighing platform.

Description

Technical Field

[0001] This utility model relates to the field of pharmaceutical equipment, and in particular to a frictionless weighing system. Background Technology

[0002] In the pharmaceutical industry, traditional weighing systems for weighing open-ended glass tubes (such as syringes) typically use a bottom rail to support the tube and move it to the weighing position. However, this method has significant drawbacks: friction between the bottom of the glass tube and the bottom rail generates particulate matter, which can enter the tube and contaminate the drug, severely affecting its quality. Furthermore, placing the tube directly on the weighing platform can cause impacts, affecting weighing accuracy and potentially damaging the tube or the weighing equipment. In addition, traditional weighing systems have complex transmission structures and poor synchronization of multiple drive motors, leading to unstable movement and further impacting weighing accuracy and equipment reliability. Therefore, there is an urgent need for a weighing system that avoids friction-induced particle generation, reduces impacts, and has a simple and reliable structure. Utility Model Content

[0003] The purpose of this invention is to provide a frictionless weighing system to achieve frictionless weighing of the workpiece to be tested, avoiding particulate matter contamination and equipment vibration interference.

[0004] To achieve the above objectives, this utility model provides a frictionless weighing system, comprising:

[0005] A conveying device used to transport workpieces to be weighed;

[0006] A gripper mechanism includes at least one pair of grippers, wherein the gripping portion of the grippers is provided with a flexible contact portion adapted to the shape of the workpiece;

[0007] A drive mechanism includes a drive motor and a transmission assembly, wherein the transmission assembly is connected to the gripper mechanism to drive its horizontal movement;

[0008] A weighing platform, including a support column and a scale installed on the top of the support column;

[0009] The lifting control mechanism includes guide rails disposed on both sides of the moving path of the gripper mechanism, and a rolling component installed on the gripper mounting platform and cooperating with the guide rails;

[0010] The guide rail includes a descending section and an ascending section along the moving direction of the gripper mechanism. The descending section is used to lower the gripper when it moves toward the weighing platform, and the ascending section is used to raise the gripper when it moves away from the weighing platform. When the drive motor drives the transmission assembly to move the gripper mechanism horizontally, the rolling component moves along the guide rail, forcing the gripper mounting platform to raise or lower the gripper, so as to achieve frictionless placement and removal of the workpiece on the weighing platform.

[0011] Furthermore, in the aforementioned frictionless weighing system, the transmission assembly includes a first transmission shaft, a second transmission shaft, a first transmission belt, a second transmission belt, and a third transmission belt. The drive motor drives the first and second transmission shafts to rotate synchronously via the first transmission belt. The first transmission shaft drives a gripper mounting support plate on one side via the second transmission belt, and the second transmission shaft drives a gripper mounting support plate on the other side via the third transmission belt. The gripper mounting support plate is fixedly connected to the gripper mounting platform of the gripper mechanism to drive the gripper mechanism to move horizontally.

[0012] Furthermore, in the aforementioned frictionless weighing system, the flexible contact part is made of an elastomer material, and its contact surface shape matches the outer surface of the workpiece.

[0013] Furthermore, in the aforementioned frictionless weighing system, when the gripper mechanism moves toward the weighing platform, the rolling component moves along the descending section, forcing the gripper to descend and place the workpiece; when the gripper mechanism moves away from the weighing platform, the rolling component moves along the ascending section, forcing the gripper to rise and remove the workpiece.

[0014] Furthermore, in the aforementioned frictionless weighing system, the support column is separately disposed from the platform, and there is no rigid connection between the scale and the platform.

[0015] Furthermore, in the aforementioned frictionless weighing system, the conveying device includes a conveying block, on which a groove for positioning the workpiece is provided, the shape of which is adapted to the shape of the workpiece.

[0016] Furthermore, in the aforementioned frictionless weighing system, the gripper mechanism also includes a guide rail and a slider, the slider being connected to the gripper mounting platform and capable of sliding along the guide rail.

[0017] Furthermore, in the aforementioned frictionless weighing system, the drive motor is a servo motor or a stepper motor.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] Compared with the prior art, this utility model eliminates the bottom rail of the bottle and clamps the workpiece through the flexible contact part of the gripper mechanism, which can avoid the friction between the workpiece and the bottom rail to generate particulate matter. It is especially suitable for workpieces that are easily affected by friction, such as glass tubes with glass at both ends. It adopts a drive motor in conjunction with the transmission component and the lifting control mechanism to realize the compound motion of horizontal movement and lifting of the gripper mechanism. Only one drive is used to complete the lifting and horizontal movement of the gripper, ensuring the smooth movement of the gripper clamping component.

[0020] In addition, the flexible contact part of the gripper is made of an elastomer material and the shape of the contact surface matches the outer surface of the workpiece, which can reduce the risk of crushing the workpiece. At the same time, the conveying block of the conveying device is equipped with a groove that matches the shape of the workpiece, ensuring accurate workpiece positioning. It can realize frictionless placement and removal of the workpiece on the weighing platform as a whole, thereby improving the reliability of weighing and product quality. Attached Figure Description

[0021] Figure 1 This is an isometric view of the frictionless weighing system in one embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of a linear cam (guide rail) structure in one embodiment of the present invention;

[0023] Figure 3 This is a detailed drawing of the gripper mechanism and flexible contact part in one embodiment of the present invention.

[0024] Among them, A is the support column; B is the platform; B-1 is the linear cam; C is the scale; D is the drive mechanism; D-1 is the drive motor; D-2 ​​is the first transmission belt; D-3 is the first transmission shaft; D-4 is the second transmission shaft; D-5 is the second transmission belt; D-6 is the third transmission belt; D-7 is the gripper mounting support plate; E-1 is the roller mounting block; E-2 is the support shaft; E-3 is the gripper mounting platform; E-4 is the roller; F is the gripper; F-1 is the gripper drive cylinder; F-2 is the gripper mounting block; F-3 is the soft arc block; G is the glass tube; and H is the conveyor block. Detailed Implementation

[0025] The frictionless weighing system of this utility model will now be described in more detail with reference to the schematic diagrams, which illustrate preferred embodiments of the utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the utility model.

[0026] For clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not detailed in detail, as they would confuse the present invention with unnecessary detail. It should be understood that in the development of any actual embodiment, numerous implementation details must be made to achieve the developer's specific goals, such as changes from one embodiment to another according to limitations related to the system or business. Furthermore, it should be understood that such development work may be complex and time-consuming, but is merely routine work for those skilled in the art.

[0027] The present invention will be described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0028] Based on the teachings of this specification, those skilled in the art can form new technical solutions by combining different implementation methods without creating technical contradictions. Such variations should be considered to fall within the protection scope of this patent.

[0029] This embodiment addresses the weighing needs of double-ended glass tubes in the pharmaceutical industry, providing a frictionless weighing system. Its core lies in using a gripper mechanism in conjunction with a lifting control structure to avoid direct friction between the glass tube and the track or weighing platform. Simultaneously, a transmission component enables single-drive dual-motion, ensuring weighing accuracy and workpiece safety.

[0030] like Figure 1 As shown, the frictionless weighing system includes a conveying device, a gripper mechanism, a drive mechanism, a weighing platform, and a lifting control mechanism.

[0031] It should be noted that the "frictionless" in this application refers to the following: the workpiece is clamped by the flexible contact part of the gripper mechanism, and the guide rail and rolling parts (such as linear cams and rollers) of the lifting control mechanism are linked together so that the workpiece does not need to directly contact and rub against the bottle bottom rail, the weighing platform and other components during the placement and removal of the workpiece on the weighing platform. This avoids friction particles from contaminating the workpiece (such as the inside of the glass tube), collisions and impacts affecting the weighing accuracy or damaging the equipment, and realizes a contactless and frictionless weighing process.

[0032] Specifically, the conveying device includes a conveying block H, the surface of which is provided with a groove that matches the shape of the glass tube G. For example, a semi-circular groove is designed for a cylindrical glass tube G to ensure that the glass tube G maintains a fixed posture during conveying, facilitating precise positioning by the gripper F.

[0033] The driving mechanism D includes a drive motor D-1 and a transmission assembly. The transmission assembly is connected to the gripper mechanism to drive its horizontal movement. In this embodiment, the drive motor D-1 can be a servo motor or a stepper motor. The transmission assembly includes a first drive shaft D-3, a second drive shaft D-4, a first drive belt D-2, a second drive belt D-5, and a third drive belt D-6. The drive motor D-1 drives the first drive shaft D-3 and the second drive shaft D-4 to rotate synchronously via the first drive belt D-2. The first drive shaft D-3 drives one side of the gripper mounting support plate D-7 via the second drive belt D-5, and the second drive shaft D-4 drives the other side of the gripper mounting support plate D-7 via the third drive belt D-6. The gripper mounting support plates D-7 on both sides are fixedly connected to the gripper mounting platform E-3 of the gripper mechanism. When the transmission belts move, the gripper mounting platform E-3 moves back and forth in the horizontal direction, driving the gripper F to move synchronously.

[0034] The weighing platform includes a support column A and a scale C. The support column A is independently fixed to the ground or frame and is completely separate from the platform B. The scale C is bolted to the top of the support column A and has no rigid connection to the platform B, ensuring that the vibration generated by the drive mechanism D on the platform B is not transmitted to the scale body, thus guaranteeing weighing accuracy.

[0035] Furthermore, the lifting control mechanism includes guide rails disposed on both sides of the movement path of the gripper mechanism, and rolling components mounted on the gripper mounting platform E-3 and cooperating with the guide rails. The guide rails include a descending section and an ascending section, the descending section being used to lower the gripper when it moves toward the weighing platform, and the ascending section being used to raise the gripper when it moves away from the weighing platform.

[0036] In this embodiment, as Figure 1 and Figure 2 A linear cam B-1 serves as the guide rail, and rollers E-4 act as rolling components; the two work together to achieve the lifting and lowering of the gripper. The linear cam B-1 is fixed to the platform B, and its track is divided into a descending section and an ascending section. Rollers E-4 are fixed to both sides of the gripper mounting platform E-3 via roller mounting blocks E-1, contacting the track grooves of the linear cam B-1. Additionally, a support shaft E-2 passes through the gripper mounting platform E-3, with both ends embedded in the guide holes of the gripper mounting support plate D-7, allowing the gripper mounting platform E-3 to slide vertically.

[0037] As the gripper mechanism moves toward the weighing platform (towards scale C), roller E-4 rolls along the descending inclined section of linear cam B-1. The cam track exerts a downward thrust on roller E-4, forcing gripper mounting platform E-3 to descend along support shaft E-2. Gripper F then smoothly places glass tube G onto the surface of scale C. After weighing, the gripper mechanism moves toward conveyor block H, and roller E-4 enters the ascending inclined section of linear cam B-1. The cam track pushes roller E-4 upward, and gripper mounting platform E-3 lifts glass tube G, disengaging it from scale C to prevent friction during material handling.

[0038] Furthermore, such as Figure 1 and Figure 3 As shown, the gripper mechanism achieves damage-free clamping through the combination of elastic contact parts and rigid drive. The gripper mechanism includes at least one pair of grippers F, which are schematically shown as a pair in this embodiment. The gripper drive cylinder F-1 is fixed to the gripper mounting platform E-3 and pushes the gripper mounting block F-2 to open and close via a piston rod. The gripping part of the gripper F has a flexible contact part adapted to the shape of the glass tube G. In this embodiment, the flexible contact part is a soft arc block F-3, which is attached to the inner side of the gripper mounting block F-2 and is made of an elastomer material, such as elastic silicone or rubber. The head of the gripper F contacts the glass tube G through the soft arc block F-3. The contact surface of the soft arc block F-3 is arc-shaped, matching the shape of the outer surface of the glass tube G. When the gripper drive cylinder F-1 pushes the gripper mounting block F-2 to close, the soft arc block F-3 elastically deforms and adheres to the surface of the glass tube G, providing a uniform clamping force and preventing the glass tube from breaking due to rigid contact.

[0039] In practical applications, the complete workflow of this frictionless weighing system is as follows:

[0040] Conveying and positioning stage:

[0041] The conveyor block H transports the glass tube G to the weighing station along the main conveyor belt. The glass tube G falls into the groove of the conveyor block H. The side wall of the groove positions the glass tube G circumferentially to ensure that its axis is perpendicular to the direction of movement of the gripper F.

[0042] Grip and descent phases:

[0043] Drive motor D-1 starts, driving the gripper mounting platform E-3 towards the glass tube G via a transmission belt. Once the predetermined position is reached, gripper drive cylinder F-1 pushes the soft arc block F-3 to clamp the glass tube G. The gripper mechanism continues to move towards the weighing platform, and roller E-4 engages with the descending section of linear cam B-1. Gripper mounting platform E-3 descends, gently placing the glass tube G onto the surface of scale C. Gripper F releases, and the glass tube G is fully supported by scale C, achieving frictionless discharge.

[0044] Weighing and data acquisition stage:

[0045] Scale C weighs the glass tube G, and the data is transmitted to the control system via a signal line. Because the support column A is isolated from the platform B, scale C is not affected by the vibration of the transmission mechanism and can quickly and stably obtain weight data.

[0046] Removal and reset phase:

[0047] The gripper drive cylinder F-1 actuates again, the soft arc block F-3 clamps the glass tube G, the drive motor D-1 rotates in the opposite direction, and the gripper mechanism moves towards the conveyor block H. The roller E-4 rolls along the rising section of the linear cam B-1, the gripper mounting platform E-3 rises, and the glass tube G disengages from the scale C to avoid friction. The gripper mechanism returns to above the conveyor block H, releasing the glass tube G, allowing it to fall into the groove and flow with the conveyor block H to the next station. The drive mechanism resets, awaiting the next weighing command.

[0048] In summary, compared with the prior art, this utility model eliminates the bottom rail of the bottle and clamps the workpiece through the flexible contact part of the gripper mechanism, which can avoid the friction between the workpiece and the bottom rail to generate particulate matter. It is especially suitable for workpieces that are easily affected by friction, such as glass tubes with glass at both ends. By using a single drive motor in conjunction with the transmission component and the lifting control mechanism, the combined motion of horizontal movement and lifting of the gripper mechanism is realized. Only one drive is used to complete the lifting and horizontal movement of the gripper, ensuring the smooth movement of the gripper clamping component.

[0049] In addition, the flexible contact part of the gripper is made of an elastomer material and the shape of the contact surface matches the outer surface of the workpiece, which can reduce the risk of crushing the workpiece. At the same time, the conveying block of the conveying device is equipped with a groove that matches the shape of the workpiece, ensuring accurate workpiece positioning. It can realize frictionless placement and removal of the workpiece on the weighing platform as a whole, thereby improving the reliability of weighing and product quality.

[0050] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A frictionless weighing system, characterized in that, include: A conveying device used to transport workpieces to be weighed; A gripper mechanism includes at least one pair of grippers, wherein the gripping portion of the grippers is provided with a flexible contact portion adapted to the shape of the workpiece; The driving mechanism includes a drive motor and a transmission assembly, wherein the transmission assembly is connected to the gripper mechanism to drive its horizontal movement; A weighing platform, including a support column and a scale installed on the top of the support column; The lifting control mechanism includes guide rails disposed on both sides of the moving path of the gripper mechanism, and a rolling component installed on the gripper mounting platform and cooperating with the guide rails; The guide rail includes a descending section and an ascending section along the moving direction of the gripper mechanism. The descending section is used to lower the gripper when it moves toward the weighing platform, and the ascending section is used to raise the gripper when it moves away from the weighing platform. When the drive motor drives the transmission assembly to move the gripper mechanism horizontally, the rolling component moves along the guide rail, forcing the gripper mounting platform to raise or lower the gripper, so as to achieve frictionless placement and removal of the workpiece on the weighing platform.

2. A frictionless weighing system according to claim 1, characterized in that The transmission assembly includes a first transmission shaft, a second transmission shaft, a first transmission belt, a second transmission belt, and a third transmission belt. The drive motor drives the first transmission shaft and the second transmission shaft to rotate synchronously via the first transmission belt. The first transmission shaft drives a gripper mounting support plate on one side via the second transmission belt, and the second transmission shaft drives a gripper mounting support plate on the other side via the third transmission belt. The gripper mounting support plate is fixedly connected to the gripper mounting platform of the gripper mechanism to drive the gripper mechanism to move horizontally.

3. The frictionless weighing system of claim 1, wherein, The flexible contact part is made of an elastomer material, and its contact surface shape matches the outer surface of the workpiece.

4. The frictionless weighing system of claim 1, wherein, When the gripper mechanism moves toward the weighing platform, the rolling component moves along the descending section, forcing the gripper to descend and place the workpiece; when the gripper mechanism moves away from the weighing platform, the rolling component moves along the ascending section, forcing the gripper to rise and remove the workpiece.

5. The frictionless weighing system of claim 1, wherein, The support column is separate from the platform, and there is no rigid connection between the scale and the platform.

6. The frictionless weighing system of claim 1, wherein, The conveying device includes a conveying block, on which a groove for positioning the workpiece is provided, the shape of which is adapted to the shape of the workpiece.

7. The frictionless weighing system of claim 1, wherein, The gripper mechanism also includes a guide rail and a slider. The slider is connected to the gripper mounting platform and can slide along the guide rail.

8. The frictionless weighing system of claim 1, wherein, The drive motor is a servo motor or a stepper motor.

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