Fixing device for measuring arm

Abstract

The utility model discloses a fixing device for a measuring arm, which comprises a fixed base, suckers are arranged at two ends of the bottom of the fixed base, air cylinders are arranged at two ends in the fixed base, one ends, far away from each other, of the two air cylinders are respectively communicated with a pair of suckers, a two-way screw rod is rotatably arranged in the fixed base, and the two-way screw rod is rotatably connected with the two ends of the two air cylinders. The two-way lead screw and the two air cylinders are distributed in the same length direction, the two air cylinders are located on the two sides of the two-way lead screw, the two-way lead screw is sleeved with a pair of sleeve blocks in a threaded mode, push plates are fixed to the pair of sleeve blocks, and piston rods matched with the pair of air cylinders are fixed to the pair of push plates respectively. According to the utility model, the fixed base is adsorbed on the workbench through the pair of suckers, compared with the traditional clamping fixation and direct placement mode, the measuring arm main body can be stably used, the abrasion caused by clamping fixation is avoided, the practicability is stronger, the overall structure is compact, and the operation is simpler and more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of fixing structures, in particular to a fixing device for a measuring arm. Background Technique

[0002] The world runs on measurements, and for hundreds of years this work has been done by manual tools such as contemporary calipers and micrometers. Although these tools can provide basic measurement functions, they are at a loss in the face of more complex dimensions (such as irregular geometric bodies, organic shapes, etc.).

[0003] The articulated arm type three-dimensional flexible measuring arm, usually called the "measuring arm", is a three-dimensional measuring device that emerged in response to the growing demand for probing solutions. The measuring arm can determine and record the position of the probe head in three-dimensional space and report the measurement results through software. Such a measuring arm can calculate the accurate position of the probe head at each point through the embedded encoders on each internal axis (or joint). It is widely used in the automotive vehicle and parts, mold, aerospace, shipbuilding, steam turbine, heavy machinery, and other machining industries. Due to its light weight (only about 4 kg) and convenient to carry, during measurement, it only needs to be placed on one side of the workpiece to be measured for measurement operations. In the actual measurement process, in order to ensure the stability of the measuring arm, the measuring arm generally adopts the method of directly placing it on a flat tabletop or using a fixture structure for fixation. Although the structure is simple and easy to operate, however, when directly placed on a flat tabletop, the measuring arm is prone to shaking and offset during use, affecting the measurement accuracy. When using a fixture, it is easy to cause wear to the clamped body and has low applicability. Aiming at the problem of inconvenient fixation of the above-mentioned measuring arm, this application proposes a fixing device for a measuring arm. Content of the Utility Model

[0004] The purpose of the utility model is to provide a fixing device for a measuring arm. By using a pair of suction cups to adsorb the fixing base on the workbench, compared with the traditional methods of clamping fixation and direct placement, it not only ensures the stable use of the measuring arm body but also avoids the wear caused by clamping fixation, has stronger practicability, and the overall structure is compact and the operation is more convenient.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A fixing device for measuring an arm, comprising: a fixing base, suction cups are installed at both ends of the bottom of the fixing base, air cylinders are arranged at both ends inside the fixing base, one end of each of the two air cylinders away from each other is communicated with a pair of suction cups respectively, a bidirectional lead screw is rotatably installed inside the fixing base, the bidirectional lead screw and the two air cylinders are distributed along the same length direction, and the two air cylinders are located on both sides of the bidirectional lead screw, a pair of sleeve blocks are threadedly sleeved on the bidirectional lead screw, push plates are fixed on a pair of sleeve blocks, piston rods respectively adapted to the two air cylinders are fixed on the pair of push plates, and a driving structure for driving the bidirectional lead screw to rotate is installed on the outer wall of the fixing base.

[0007] Preferably, a driven bevel gear is fixedly sleeved at one end of the bidirectional lead screw, a driving bevel gear is rotatably installed on the inner top wall of the fixing base, and the driving bevel gear meshes with the driven bevel gear.

[0008] Preferably, the driving structure includes a shaft rod rotatably installed vertically at the top of the fixing base, the bottom end of the shaft rod is coaxially and fixedly connected with the driving bevel gear, and a rotating plate is radially fixed at the top end of the shaft rod.

[0009] Preferably, a through hole is formed at one end of the rotating plate away from the shaft rod, a connecting rod is vertically movably inserted through the through hole, a handle is fixedly sleeved at the top end of the connecting rod, a positioning threaded head is fixed at the bottom end of the connecting rod, and a plurality of positioning holes threadedly adapted to the positioning threaded head are formed on the upper surface of the fixing base.

[0010] Preferably, a guide rail is fixed on the inner side wall of the fixing base along the length direction of the air cylinder, and one end of the push plate away from the sleeve block is slidably matched with the guide rail.

[0011] Preferably, a guide block is arranged at one end of the push plate away from the sleeve block, and a guide groove slidably fitted with the guide block is formed on the guide rail.

[0012] Preferably, a rotating seat is installed at the center of the top of the fixing base, branch pipes are connected to one end of each of the two air cylinders away from each other, and the suction cup is communicated with the air cylinder through the branch pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] In the present utility model, the main body of the measuring arm is mounted on the fixed base through a rotating seat, and a pair of suction cups are provided at the bottom of the fixed base. A pair of air cylinders communicating with the suction cups are arranged inside the fixed base. Only by driving the bidirectional lead screw to rotate through the driving structure, driving a pair of sleeve blocks to drive a pair of push plates to move away from each other, the push plates drive the corresponding piston rods to cooperate with the air cylinders to pump air, generating suction force at the pair of suction cups. Thus, the fixed base is adsorbed on the workbench through the pair of suction cups. Compared with the traditional methods of clamping and direct placement, it not only ensures the stable use of the main body of the measuring arm but also avoids the wear caused by clamping, has stronger practicability, and the overall structure is compact and the operation is more convenient.

[0015] In the present utility model, through the structural arrangement that two air cylinders are arranged along the same length direction and on both sides of the bidirectional lead screw, and using the drive of the bidirectional lead screw to pump air, it can not only ensure that suction force is generated simultaneously at the two suction cups for adsorption and fixation, but also make the distance between the pair of suction cups as large as possible, improving the stability of the fixed base fixed on the tabletop. The structure is reasonable and has high performance in use.

[0016] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is a schematic diagram of the internal top view structure of the fixed base of the present utility model;

[0019] Figure 3 is a schematic diagram of the structure of the push plate and the guide rail of the present utility model;

[0020] Figure 4 is a schematic diagram of the structure of the driving structure of the present utility model.

[0021] In the figure: 1. Main body of the measuring arm; 2. Fixed base; 3. Rotating seat; 4. Positioning hole; 5. Driving structure; 6. Suction cup; 7. Air cylinder; 8. Branch pipe; 9. Piston rod; 10. Push plate; 11. Bidirectional lead screw; 12. Sleeve block; 13. Guide rail; 14. Driven bevel gear; 15. Driving bevel gear; 16. Guide groove; 17. Guide block; 18. Shaft rod; 19. Rotating plate; 20. Connecting rod; 21. Positioning threaded head; 22. Handle; 23. Through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, it should not be construed as a limitation to the present utility model. The following will introduce each embodiment of the present utility model in detail with reference to the drawings.

[0023] Embodiment

[0024] Please refer to Figures 1 to 4 , the present utility model preferably provides a technical solution: a fixing device for a measuring arm, including a fixing base 2. A rotating base 3 is installed at the center of the top of the fixing base 2 for assembling the main body 1 of the measuring arm. Suction cups 6 are installed at both ends of the bottom of the fixing base 2 for adsorbing and fixing the fixing base 2. Air cylinders 7 are arranged at both ends inside the fixing base 2. One end of the two air cylinders 7 away from each other is respectively connected to a pair of suction cups 6. Specifically, one end of the two air cylinders 7 away from each other is connected to a branch pipe 8, and the suction cup 6 is connected to the air cylinder 7 through the branch pipe 8.

[0025] As a preferred implementation manner of this embodiment, a bidirectional lead screw 11 is rotatably installed inside the fixing base 2. The bidirectional lead screw 11 and the two air cylinders 7 are distributed along the same length direction, and the two air cylinders 7 are located on both sides of the bidirectional lead screw 11. A pair of sleeve blocks 12 are sleeved on the bidirectional lead screw 11 in a threaded manner. Push plates 10 are fixed on a pair of sleeve blocks 12. Piston rods 9 respectively adapted to the two air cylinders 7 are fixed on the pair of push plates 10. A driving structure 5 for driving the bidirectional lead screw 11 to rotate is installed on the outer wall of the fixing base 2. By driving the bidirectional lead screw 11 to rotate through the driving structure 5, a pair of sleeve blocks 12 are driven to drive a pair of push plates 10 away from each other. The push plates 10 drive the corresponding piston rods 9 to cooperate with the air cylinders 7 to pump air, generating suction at a pair of suction cups 6, and then adsorbing the fixing base 2 on the workbench. Compared with the traditional methods of clamping and direct placement, it not only ensures the stable use of the main body 1 of the measuring arm, but also avoids the wear caused by clamping. The structural arrangement that the two air cylinders 7 are along the same length direction and located on both sides of the bidirectional lead screw 11, using the driving of the bidirectional lead screw 11 to pump air, can not only ensure the simultaneous generation of suction at the two suction cups 6 for adsorption and fixation, but also make the distance between the pair of suction cups 6 as large as possible, improving the stability of the fixing base 2 fixed on the tabletop.

[0026] In this embodiment, a driven bevel gear 14 is fixedly sleeved at one end of the bidirectional lead screw 11. A driving bevel gear 15 is rotatably installed on the inner top wall of the fixed base 2. The driving bevel gear 15 meshes with the driven bevel gear 14. The driving structure 5 includes a shaft rod 18 rotatably installed vertically on the top of the fixed base 2. The bottom end of the shaft rod 18 is coaxially and fixedly connected to the driving bevel gear 15. A rotating plate 19 is radially fixed at the top end of the shaft rod 18. By rotating the rotating plate 19, the shaft rod 18 and the driving bevel gear 15 are driven to rotate. By utilizing the meshing of the driving bevel gear 15 and the driven bevel gear 14, the bidirectional lead screw 11 can be driven to rotate, causing the two air cylinders 7 to inhale air.

[0027] In this embodiment, a guide rail 13 is fixed on the inner side wall of the fixed base 2 along the length direction of the air cylinder 7. The end of the push plate 10 away from the sleeve block 12 is slidably matched with the guide rail 13. A guide block 17 is arranged at the end of the push plate 10 away from the sleeve block 12. A guide groove 16 for slidably fitting the guide block 17 is formed on the guide rail 13. By utilizing the sliding fit between the guide block 17 at the end of the push plate 10 and the guide groove 16 on the guide rail 13, the push plate 10 can be prevented from rotating along with the sleeve block 12 and the bidirectional lead screw 11.

[0028] Further, a through hole 23 is formed at the end of the rotating plate 19 away from the shaft rod 18. A connecting rod 20 is vertically movably inserted through the through hole 23. A handle 22 is fixedly sleeved at the top end of the connecting rod 20. A positioning threaded head 21 is fixed at the bottom end of the connecting rod 20. A plurality of positioning holes 4 threadedly adapted to the positioning threaded head 21 are formed on the upper surface of the fixed base 2. When the handle 22 is pushed down and rotated, the positioning threaded head 21 is threadedly inserted into the corresponding positioning hole 4 on the fixed base 2. At this time, the rotation of the rotating plate 19 is positioned, which can prevent air leakage of the air cylinder 7 caused by the self-rotation of the bidirectional lead screw 11. By screwing the handle 22 to disengage the positioning threaded head 21 from the positioning hole 4, the handle 22 can be lifted and the rotating plate 19 can be pushed to rotate, for driving the bidirectional lead screw 11 to rotate.

[0029] During assembly, the measuring arm main body 1 is installed on the rotating seat 3. When measuring a workpiece, the fixed base 2 is horizontally placed on the workbench. The pair of suction cups 6 at the bottom of the fixed base 2 are attached to the workbench. Then, hold the handle 22 and drive the rotating plate 19 to rotate. The rotating plate 19 drives the driving bevel gear 15 to rotate through the shaft rod 18. By utilizing the meshing of the driving bevel gear 15 and the driven bevel gear 14, the bidirectional lead screw 11 is driven to rotate. The bidirectional lead screw 11 rotates to drive a pair of sleeve blocks 12 and a pair of push plates 10 to move away from each other. The push plates 10 drive the corresponding piston rods 9 to cooperate with the air cylinders 7 to pump air, generating suction force at the pair of suction cups 6. Thus, the fixed base 2 is adsorbed on the workbench through the pair of suction cups 6. Compared with the traditional methods of clamping and direct placement, it not only ensures the stable use of the measuring arm main body 1 but also avoids the wear caused by clamping and fixing, has stronger practicability, and the overall structure is compact and the operation is simple.

[0030] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. Among them, there are various ways of detachable installation. For example, it can be by the way of cooperation between insertion and snap, and for another example, by the way of bolt connection, etc.

[0031] The above, in combination with the embodiments and the drawings, clearly and completely describes the concept, specific structure and technical effects of the present utility model to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present utility model. In addition, all the connection / linkage relationships mentioned in the text do not only refer to the direct connection of components, but refer to the formation of a more optimal connection structure by adding or reducing connection accessories according to the specific implementation situation.

[0032] The specific description of the present utility model in the above embodiments is only used to further illustrate the present utility model and cannot be understood as a limitation on the protection scope of the present utility model. Any non-essential improvements and adjustments made by those skilled in the art according to the content of the above utility model shall fall within the protection scope of the present utility model.

Claims

1. A fixing device for a measuring arm, characterized in that: include: A fixed base (2), wherein suction cups (6) are installed at both ends of the bottom of the fixed base (2), and air cylinders (7) are arranged at both ends inside the fixed base (2), and the ends of the two air cylinders (7) that are away from each other are respectively connected to a pair of suction cups (6), and a bidirectional screw rod (11) is rotatably installed inside the fixed base (2), and the bidirectional screw rod (11) and the two air cylinders (7) are distributed along the same length direction, and the two air cylinders (7) are located on both sides of the bidirectional screw rod (11), and a pair of sleeve blocks (12) are threadedly sleeved on the bidirectional screw rod (11), and a pair of the sleeve blocks (12) are fixed with push plates (10), and a pair of the push plates (10) are fixed with piston rods (9) respectively adapted to the pair of air cylinders (7), and a driving structure (5) for driving the bidirectional screw rod (11) to rotate is installed on the outer wall of the fixed base (2).

2. A fixing device for a measuring arm according to claim 1, characterized in that: A driven bevel gear (14) is fixedly sleeved at one end of the bidirectional screw rod (11), and a driving bevel gear (15) is rotatably mounted on the top wall inside the fixed base (2), and the driving bevel gear (15) is meshed with the driven bevel gear (14).

3. A fixing device for a measuring arm according to claim 2, characterized in that: The driving structure (5) comprises a shaft (18) vertically rotatably mounted on the top of the fixed base (2); the bottom end of the shaft (18) is coaxially fixedly connected to the active bevel gear (15); and a rotating plate (19) is radially fixed to the top end of the shaft (18).

4. A fixing device for a measuring arm according to claim 3, characterized in that: A through hole (23) is provided at one end of the rotating plate (19) away from the shaft (18), a connecting rod (20) is vertically and movably inserted into the through hole (23), a handle (22) is fixedly sleeved on the top end of the connecting rod (20), a positioning thread head (21) is fixed on the bottom end of the connecting rod (20), and a plurality of positioning holes (4) threadably matched with the positioning thread head (21) are provided on the upper surface of the fixed base (2).

5. A fixing device for a measuring arm according to claim 1, characterized in that: A guide rail (13) is fixed on the inner side wall of the fixed base (2) along the length direction of the air cylinder (7), and one end of the push plate (10) away from the sleeve block (12) is slidably matched with the guide rail (13).

6. A fixing device for a measuring arm according to claim 5, characterized in that: A guide block (17) is arranged at one end of the push plate (10) away from the sleeve block (12), and a guide groove (16) is provided on the guide rail (13) for sliding engagement with the guide block (17).

7. A fixing device for a measuring arm according to claim 1, characterized in that: A rotating seat (3) is installed at the center of the top of the fixed base (2), and the ends of the two air cylinders (7) that are away from each other are connected to branch pipes (8), and the suction cup (6) is connected to the air cylinder (7) through the branch pipe (8).

Images