Calibration bat

Abstract

The utility model discloses a ball bat for calibration. The ball bat comprises a mounting part, a fixing part and at least two standard balls, the mounting part is connected with each standard ball; the fixing part comprises a supporting structure, a connecting structure and a fixing structure, the supporting structure is selectively mounted on the mounting part, the connecting structure is connected with the supporting structure and the mounting part, so that the supporting structure is detachably connected with the mounting part, and the fixing structure is arranged on the supporting structure and used for fixing the supporting structure to the to-be-calibrated equipment. According to the scheme, the fixing parts are all detachably connected with the mounting part, so that the fixing parts of various different structures can be arranged according to needs, the corresponding fixing parts are selected according to the size and the fixing mode of the to-be-calibrated equipment, then the calibration device can be suitable for the to-be-calibrated equipment of various sizes or fixing modes, and practicability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to three -dimensional coordinate measurement system calibration technical field, concretely relates to a calibration ball bat. BACKGROUND

[0002] The calibration ball bat is usually composed of standard balls and connecting structures, two or more standard balls with equal diameters and arranged in a straight line are usually provided, and the multiple standard balls are connected through the rigid connecting structures to form a standard connector, which is mainly used for calibration of a three-dimensional coordinate measurement system.

[0003] Publication No. CN217833423U discloses a calibration ball bat for a three-dimensional scanner, which includes a connecting rod and two positioning balls, and a fixer is arranged on the connecting rod to enable the ball bat to be stably fixed on a support platform to avoid sliding, and mounting grooves are arranged on the two positioning balls, and the end portions of the connecting rod are both movable ends, and the two movable ends are movably connected with the mounting grooves of the two positioning balls through connecting pieces to ensure the connection stability of the positioning balls and the connecting rod.

[0004] However, the setting structure of the fixer in the patent cannot be adjusted, and it can only be fixed to the matched device to be calibrated, and the practicality needs to be improved. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the above technical deficiencies, and provides a calibration ball bat to solve the technical problem that the setting structure of the fixer of the calibration ball bat in the prior art cannot be adjusted, and it can only be fixed to the matched device to be calibrated, and the practicality needs to be improved.

[0006] To achieve the above technical purposes, the utility model adopts the following technical scheme:

[0007] The utility model provides a calibration ball bat, which comprises:

[0008] At least two standard balls;

[0009] A mounting portion connected with the standard balls; and

[0010] A fixing portion comprising a support structure, a connecting structure and a fixing structure, the support structure is selectively mounted on the mounting portion, the connecting structure connects the support structure and the mounting portion, so that the support structure and the mounting portion are detachably connected, and the fixing structure is arranged on the support structure and used for fixing the support structure to a device to be calibrated.

[0011] In one embodiment, at least one of the fixing structures comprises a magnetic attraction piece connected to the support structure and used for magnetic attraction to the device to be calibrated.

[0012] In one of the embodiments, the magnetic attraction member comprises a magnetic attraction block and a connecting screw rod, one end of the connecting screw rod is connected to the magnetic attraction block.

[0013] The support structure is provided with a first screw hole, and the support structure is threadedly connected with the connecting screw rod via the first screw hole.

[0014] In one of the embodiments, the support structure has a plurality of mounting end faces, and the plurality of mounting end faces are used to selectively adhere to a work platform of the device to be calibrated.

[0015] The fixing structure comprises a plurality of fixing members, and the plurality of fixing members are respectively arranged on the plurality of mounting end faces. When each fixing member adheres to the work platform at the corresponding mounting end face, the fixing member can be fixed to the work platform.

[0016] In one of the embodiments, the mounting portion comprises a mounting arm, and the mounting arm is connected to each standard ball.

[0017] The connecting structure and the support structure surround a connecting passage, and the connecting passage is provided for the mounting arm to be inserted.

[0018] In one of the embodiments, the connecting passage has an opening that is connected to the outside.

[0019] The connecting structure comprises a locking member and two extension arms, the two extension arms are connected to the outer wall surface of the connecting passage and are arranged in a circumferential direction of the connecting passage and are located on both sides of the opening, and the locking member is connected to the two extension arms and is used to drive the two extension arms to move closer to or away from each other.

[0020] In one of the embodiments, each extension arm is provided with a communication hole in a direction away from the other extension arm.

[0021] The locking member comprises a locking screw rod and a locking nut, the locking screw rod is inserted into the two communication holes, and the locking nut is screwed on one end of the locking screw rod that protrudes out of the communication hole.

[0022] In one of the embodiments, the support structure comprises a support seat and a stop plate, and the stop plate is mounted on the support seat.

[0023] The connecting structure comprises a connecting plate and a clamping driving member, the connecting plate is connected to the support seat and is located on the same side of the support seat as the stop plate at least in part, and the connecting plate can move closer to or away from the stop plate, and the connecting plate, the stop plate and the support seat surround to form the connecting passage, and the clamping driving member is connected to the connecting plate and is used to drive the connecting plate to move closer to or away from the stop plate.

[0024] In one of the embodiments, the support base is provided with a second screw hole, which extends along the arrangement direction of the connecting plate and the stop plate, and the connecting plate is provided with a matching hole corresponding to the second screw hole;

[0025] The clamping driving member comprises a driving screw, which is arranged in the matching hole and screwed in the second screw hole.

[0026] In one of the embodiments, the mounting part is provided with at least two through holes corresponding to the at least two standard balls, and each standard ball is provided with a mounting handle having a threaded section arranged in the through hole;

[0027] The calibration ball rod further comprises at least two mounting nuts corresponding to the standard balls, and each mounting nut is screwed in one end of the threaded section protruding out of the through hole.

[0028] Compared with the prior art, in the calibration ball rod, the standard balls are mounted on the mounting part, and the fixing part can be detachably connected with the mounting part through the connecting structure, so that a plurality of fixing parts with different structures can be set according to requirements, and the fixing part with the corresponding support structure and fixing structure can be selected according to the size or fixing mode of the device to be calibrated, and then the selected support structure and the mounting part are connected through the connecting structure, and then the support structure is fixed on the device to be calibrated through the fixing structure, so that the standard ball is stably fixed on the device to be calibrated.

[0029] Therefore, in the present scheme, the fixing part and the mounting part are detachably connected, so that a plurality of fixing parts with different structures can be set, and the corresponding fixing part can be selected according to the size and fixing mode of the device to be calibrated, which can be applied to devices to be calibrated with various sizes or fixing modes, and the practicability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic view of the calibration ball rod in the embodiment of the present application when assembling a fixing part;

[0031] Figure 2 is Figure 1 a schematic view of the calibration ball rod in

[0032] Figure 3 is Figure 1 a schematic view of the calibration ball rod in

[0033] Figure 4 is Figure 2 a schematic view of the fixing part in

[0034] Figure 5 isFigure 3 Schematic view of the fixing part;

[0035] Figure 6 is Figure 1 Schematic view of the standard ball and the mounting handle.

[0036] Explanation of reference signs:

[0037] 1, standard ball; 2, mounting part; 21, mounting arm; 3, fixing part; 3a, connecting channel; 3b, opening; 31, support structure; 31a, first screw hole; 311, mounting end face; 312, support seat; 313, stop plate; 32, connecting structure; 321, extension arm; 322, locking piece; 323, connecting plate; 324, clamping driving piece; 325, driving screw; 326, guide rod; 33, fixing structure; 331, magnetic attraction piece; 4, mounting handle; 41, threaded section; 5, mounting nut. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the following will be further detailed in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0039] In order to solve the technical problem that the setting structure of the existing ball rod fixing device for calibration cannot be adjusted, and can only be fixed to the matched device to be calibrated, and the practicality needs to be improved, the utility model provides a ball rod for calibration, which can be applied to various types of devices to be calibrated, and the practicality is improved.

[0040] Please refer to Figures 1 to 3 , Figures 1 to 3 It is a structural schematic view of the ball rod for calibration in an embodiment of the utility model, which comprises a mounting part 2, a fixing part 3 and at least two standard balls 1. The mounting part 2 is connected with each standard ball 1. The fixing part 3 comprises a support structure 31, a connecting structure 32 and a fixing structure 33. The support structure 31 is selectively mounted on the mounting part 2. The connecting structure 32 connects the support structure 31 and the mounting part 2, so that the support structure 31 and the mounting part 2 are detachably connected. The fixing structure 33 is arranged on the support structure 31, and is used for fixing the support structure 31 to the device to be calibrated.

[0041] The ball bat for calibration provided by the utility model has the advantages that the standard ball 1 is installed on the mounting portion 2, the fixing portion 3 can be detachably connected with the mounting portion 2 through the connecting structure 32, the fixing portion 3 with different structures can be set according to requirements, the fixing portion 3 with the corresponding support structure 31 and the fixing structure 33 is selected according to the size or the fixing mode of the equipment to be calibrated, the selected support structure 31 is connected with the mounting portion 2 through the connecting structure 32, then the support structure 31 is fixed on the equipment to be calibrated through the fixing structure 33, and the stable fixation of the standard ball 1 on the equipment to be calibrated is realized.

[0042] Therefore, in the scheme, the fixing portion 3 is detachably connected with the mounting portion 2, the fixing portion 3 with different structures can be set, the corresponding fixing portion 3 is selected according to the size and the fixing mode of the equipment to be calibrated, the equipment to be calibrated with different sizes or fixing modes can be applied, and the practicability is improved.

[0043] Specifically, in an embodiment, the fixing portion 3 is provided with multiple kinds, and the multiple kinds of fixing portion 3 are selectively installed on the mounting portion 2; wherein the support structure 31 of the multiple kinds of fixing portion 3 is different, and / or the fixing structure 33 of the multiple kinds of fixing portion 3 is different, so that the corresponding kind of fixing portion 3 can be selected according to the installation requirements of the equipment to be calibrated.

[0044] It should be noted that the multiple kinds of support structure 31 are different, which can mean that the sizes of the multiple kinds of support structure 31 are different, the shapes of the multiple kinds of support structure 31 are different, or the sizes and the shapes of the multiple kinds of support structure 31 are different. Similarly, the multiple kinds of fixing structure 33 are different, which can mean that the sizes of the multiple kinds of fixing structure 33 are different, the shapes of the multiple kinds of fixing structure 33 are different, or the sizes and the shapes of the multiple kinds of fixing structure 33 are different.

[0045] In addition, it should be understood that the ball bat for calibration in the scheme is used in work, and only one fixing portion 3 is arranged on the mounting portion 2, so that the mounting portion 2 is prevented from being interfered with the equipment to be calibrated when multiple fixing portions 3 are arranged on the mounting portion 2 at the same time, and the compactness of the ball bat for calibration is facilitated to be improved.

[0046] It should be noted that the specific form of the fixing structure 33 is not limited, as long as the support structure 31 can be fixed on the equipment to be calibrated. In an embodiment, at least one support structure 31 is provided with a fixing hole, and correspondingly, at least one fixing structure 33 includes a fixing screw, the fixing screw can be arranged in the fixing hole and is used to be threadedly connected with a connecting screw hole arranged on the equipment to be calibrated.

[0047] In this embodiment, the fixing hole is arranged on the support structure 31, and the fixing structure 33 is correspondingly arranged as a fixing screw rod, so that the standard ball 1 is fixed on the equipment to be calibrated through the fixing screw rod, and the fixing mode is simple and reliable. It should be noted that in another embodiment, the pin hole can also be arranged on the support structure 31, and the fixing structure 33 is correspondingly arranged as a pin, so that the standard ball 1 is fixed on the equipment to be calibrated through the pin; the fixing structure 33 can also be arranged in other forms.

[0048] In one of the embodiments, at least one fixing structure 33 includes a magnetic attraction piece 331 connected to the support structure 31 and used to be magnetically attracted to the equipment to be calibrated.

[0049] In this embodiment, the fixing structure 33 is arranged as a magnetic attraction piece 331, and the standard ball 1 is fixed on the equipment to be calibrated through the magnetic attraction mode, which is simple and convenient to operate. It should be noted that the magnetic attraction piece 331 can be a magnetic strip, a magnetic sheet or a magnetic block; the support structure 31 can also be composed of a magnetic material as a whole, and at this time, the part of the support structure 31 connected to the equipment to be calibrated constitutes the fixing structure 33.

[0050] In one of the embodiments, the magnetic attraction piece 331 includes a magnetic attraction block and a connecting screw rod, one end of the connecting screw rod is connected to the magnetic attraction block; the support structure 31 is correspondingly provided with a first screw hole 31a, and the support structure 31 is threadedly connected with the connecting screw rod through the first screw hole 31a.

[0051] In this embodiment, the detachable connection between the magnetic attraction piece 331 and the support structure 31 is realized through the cooperation of the connecting screw rod and the first screw hole 31a, so that the magnetic attraction block can be replaced when it is damaged, the magnetic attraction capability is ensured, and the structure is simple and convenient to operate.

[0052] In one of the embodiments, the support structure 31 has a plurality of mounting end faces 311, which are used to selectively adhere to the workbench of the equipment to be calibrated; the fixing structure 33 includes a plurality of fixing pieces, and the plurality of fixing pieces are respectively arranged on the plurality of mounting end faces 311. Each fixing piece can be fixed to the workbench when it adheres to the workbench on the corresponding mounting end face 311.

[0053] In this embodiment, a plurality of mounting end faces 311 are arranged on the support structure 31, which can adhere to the workbench of the equipment to be calibrated according to the needs, and then fixed through the fixing pieces, so that the pose of the standard ball 1 on the workbench can be flexibly adjusted, and the calibration accuracy is improved. In one embodiment, the mounting end face 311 is provided with two mounting end faces 311 arranged at 90°, so as to support the standard ball 1 to be placed at 90°.

[0054] It should be noted that the fixing members on the plurality of mounting end faces 311 can be set in the same form or in different forms. Specifically, in the present scheme, the fixing members on the plurality of mounting end faces 311 are set in the same form. In an embodiment, the fixing members are fixing holes, i.e., the plurality of mounting end faces 311 are respectively provided with fixing holes. In another embodiment, the fixing members are set as magnetic blocks, i.e., the plurality of mounting end faces 311 are respectively provided with magnetic blocks.

[0055] In one of the embodiments, referring to Figure 4 and Figure 5 , the mounting part 2 comprises mounting arms 21 connected with the standard balls 1; the connecting structure 32 and the support structure 31 surround a connecting channel 3a for the mounting arms 21 to be inserted.

[0056] In the present embodiment, the mounting arms 21 are inserted into the connecting channel 3a formed by the connecting structure 32 and the support structure 31, so as to realize the detachable connection between the mounting part 2 and the support structure 31, which is simple to operate and has a simple structure and saves cost.

[0057] In one of the embodiments, referring to Figure 1 and Figure 4 , the connecting channel 3a has an opening 3b communicating with the outside; the connecting structure 32 comprises locking members 322 and two extension arms 321, the two extension arms 321 are connected to the outer wall surface of the connecting channel 3a and are arranged in a circumferential direction of the connecting channel 3a and located on both sides of the opening 3b, and the locking members 322 are connected to the two extension arms 321 for driving the two extension arms 321 to move towards or away from each other.

[0058] In the present embodiment, the two extension arms 321 can be tightened by the locking members 322, so as to tighten the side walls of the connecting channel 3a at both ends of the opening 3b to hold the mounting arms 21, so that the connection between the mounting arms 21 and the support structure 31 is more stable.

[0059] It should be noted that the locking members 322 can be set in the form of a hydraulic rod, a pneumatic cylinder or a hoisting rope, and can also be set in other forms.

[0060] In one of the embodiments, each extension arm 321 is provided with a through hole in a direction away from the other extension arm 321; the locking members 322 comprise locking screws and locking nuts, the locking screws are inserted into the two through holes, and the locking nuts are screwed onto one end of the locking screws extending out of the through holes.

[0061] In the embodiment, the distance between the two extension arms 321 can be adjusted by the tension lock nut, so as to adjust the holding degree of the side wall of the connecting channel 3a to the mounting arm 21, and the operation is simple. It should be noted that the specific arrangement form of the support structure 31 and the connecting structure 32 is not limited, and the two can be arranged in the form of a frame body, or in the form of a seat body or a cylinder, or in other forms.

[0062] In one of the embodiments, referring to Figure 3 and Figure 5 , the support structure 31 includes a support seat 312 and a stop plate 313, and the stop plate 313 is installed on the support seat 312; the connecting structure 32 includes a connecting plate 323 and a clamping driving piece 324, the connecting plate 323 is connected to the support seat 312, and at least part of the connecting plate 323 is located on the same side of the support seat 312 as the stop plate 313, and the connecting plate 323 can move close to and away from the stop plate 313, and the stop plate 313 and the support seat 312 form a connecting channel 3a, and the clamping driving piece 324 is connected to the connecting plate 323, and is used to drive the connecting plate 323 to move close to and away from the stop plate 313.

[0063] In the embodiment, the distance between the connecting plate 323 and the stop plate 313 can be adjusted by the clamping driving piece 324, and the size of the connecting channel 3a is adjusted, so that mounting arms 21 of various sizes can be fixed, and the practicability is further improved.

[0064] It should be noted that the clamping driving piece 324 can be in the form of a pneumatic cylinder, a hydraulic rod or a linear motor, or in other forms.

[0065] In one embodiment, the support seat 312 is provided with a second screw hole extending along the arrangement direction of the connecting plate 323 and the stop plate 313, and the connecting plate 323 is provided with a matching hole corresponding to the second screw hole; the clamping driving piece 324 includes a driving screw 325, the driving screw 325 is arranged in the matching hole and is screwed into the second screw hole.

[0066] In the embodiment, the connecting plate 323 can be driven to move close to the stop plate 313 when the driving screw 325 is tightened, and the connecting plate 323 can be driven to move away from the stop plate 313 by applying an external force when the driving screw 325 is loosened. In addition, in the present scheme, the support seat 312 is further provided with a guide hole, the extension direction of the guide hole is the same as the extension direction of the second screw hole, the connecting plate 323 is correspondingly connected with a guide rod 326, the guide rod 326 is slidably inserted into the guide hole, so as to avoid the deviation of the connecting plate 323 during movement. Specifically, the guide rod 326 is spaced apart by two, and the guide hole is correspondingly provided with two.

[0067] In one of the embodiments, referring to Figure 1 and Figure 6The mounting portion 2 is provided with at least two through holes corresponding to the at least two standard balls 1, and each standard ball 1 is provided with a mounting handle 4 corresponding to the through hole, and the mounting handle 4 has a threaded section 41 penetrating through the through hole; the calibration ball rod further comprises at least two mounting nuts 5 corresponding to the standard ball 1, and each mounting nut 5 is screwed on one end of the threaded section 41 protruding out of the through hole.

[0068] In the embodiment, the standard ball 1 is detachably mounted on the mounting portion 2 through the mounting handle 4 and the mounting nut 5, so as to facilitate replacement of the standard ball 1. Specifically, the standard ball 1 is provided with an axle hole, and one end of the mounting handle 4 is connected with a plug which can be inserted into the axle hole of the standard ball 1 and fixed by using glue.

[0069] It should be noted that the standard ball 1 in the scheme is provided with two, and the two standard balls 1 are respectively arranged at the two ends of the mounting arm 21. In addition, various fixing portions 3 are provided with two, and two fixing portions 3 of the same type are respectively connected to the two ends of the mounting arm 21, so as to improve the mounting stability of the standard ball 1.

[0070] Specifically, in an embodiment, the standard ball 1 adopts a matte ceramic ball with a hole, the ball diameter is 38.1 millimeters, and the ball roundness is less than 3 microns. According to the use requirement, the ceramic ball can be replaced by a steel ball or a hard alloy ball.

[0071] The mounting handle 4 adopts a cylindrical structure with different diameters, the top part is connected with the circular hole of the standard ball 1, and the bottom part is connected with the mounting arm 21 through a circular nut. In addition, the mounting handle 4 is made of inconel, so as to reduce the influence of thermal expansion of the mounting handle 4 on the ball center distance.

[0072] The mounting arm 21 adopts a carbon fiber rectangular tube, the cross-sectional size is 30 millimeters x 20 millimeters, and the thickness is not less than 2 millimeters. The mounting arm 21 made of carbon fiber adopts a molding process, and the carbon fiber grade adopts T800.

[0073] The two ends of the mounting arm 21 are provided with circular through holes, the mounting handle 4 penetrates through the circular through holes, and the gap between the mounting handle 4 and the hole is not greater than 0.05 millimeters, so as to reduce the deformation amount of the mounting arm 21 under vibration impact load.

[0074] In addition, the mounting arm 21 supports various fixing portions 3, so as to facilitate use of the product on different test platforms, and supports the ball rod to be placed at 90 degrees. In addition, as shown in the embodiments of FIGS. 2 and 3, the fixing portion 3 is small and convenient, and is convenient to disassemble. The maximum displacement amount of the connecting plate 323 can be controlled to be 12 millimeters, and the ball rod can be placed at 90 degrees. In addition, the bottom of the embodiment is provided with a threaded hole, that is, a first screw hole 31a, so as to facilitate installation of a magnetic block. Figure 3 Figure 5

[0075] ​​After testing, the calibration ball rod in the scheme has a change in ball center distance of less than 0.006 mm immediately after high temperature testing, a change in ball center distance of less than 0.003 mm after being placed for 30 minutes after high temperature, a change in ball center distance of less than 0.005 mm immediately after low temperature testing, a change in ball center distance of less than 0.002 mm after being placed for 30 minutes after low temperature testing, a change in ball center distance of less than 0.006 mm immediately after vibration, impact and drop, and a change in ball center distance of less than 0.002 mm after being placed for 30 minutes. In summary, the change in ball center distance of the scheme is less than 0.01 mm / m under high and low temperature, vibration, impact and drop.

[0076] The overall weight is less than 1 kg (excluding the fixing part 3), and the cost is reduced, the assembly tool only needs a hexagonal wrench with torque, and a single person can complete the installation in 30 minutes. The change in ball center distance is less than 0.01 mm / m under different use temperatures and transportation conditions, the product cost is reduced, the product weight is reduced, and the assembly difficulty is reduced.

[0077] In order to better understand the utility model, the following will be combined with Figures 1 to 6 The technical scheme of the utility model is described in detail as follows:

[0078] In the scheme, the corresponding fixing part 3 can be selected according to the size and fixing mode of the device to be calibrated, the fixing part 3 is assembled with the mounting arm 21 through the corresponding connecting structure 32, and then the fixing part 3 is magnetically attracted to the device to be calibrated through the magnetic block, which can be suitable for various types of devices to be calibrated and can support the ball rod to be placed at 90 degrees, and has good practicability.

[0079] The specific embodiments of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any various other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A calibration ball bat, characterized by, The application relates to a standard ball calibration device, which comprises the following parts: at least two standard balls; a mounting part connected with the standard balls; and a fixing part comprising a support structure, a connecting structure and a fixing structure, wherein the support structure is selectively mounted on the mounting part, the connecting structure connects the support structure with the mounting part so that the support structure and the mounting part are detachably connected, and the fixing structure is arranged on the support structure and used for fixing the support structure on a device to be calibrated. The fixing structure comprises a magnetic attraction element connected with the support structure and used for magnetic attraction on the device to be calibrated. The magnetic attraction element comprises a magnetic attraction block and a connecting screw, one end of the connecting screw being connected with the magnetic attraction block. The support structure is provided with a first screw hole corresponding to the connecting screw, and the support structure is threadedly connected with the connecting screw through the first screw hole. The support structure has a plurality of mounting end faces used for selectively abutting on a workbench of the device to be calibrated.

2. The calibration bat of claim 1, wherein, The fixing structure comprises a plurality of fixing elements respectively arranged on the mounting end faces, and each fixing element can be fixed on the workbench when the fixing element abuts on the workbench at the corresponding mounting end face.

3. The calibration bat of claim 2, wherein, The mounting part comprises a mounting arm connected with the standard balls. The connecting structure and the support structure surround a connecting channel for inserting the mounting arm.

4. The calibration bat of claim 1, wherein, The connecting channel has an opening communicating with the outside. The connecting structure comprises a locking element and two extension arms connected with the outer wall surface of the connecting channel and arranged at intervals along the circumference of the connecting channel and located on both sides of the opening, and the locking element connects the two extension arms and drives the two extension arms to move close to or away from each other.

5. The calibration bat of claim 1, wherein, Each extension arm is provided with a communication hole in the direction away from the other extension arm. The locking element comprises a locking screw and a locking nut, the locking screw is arranged in the two communication holes, and the locking nut is threadedly arranged on one end of the locking screw extending out of the communication hole.

6. The calibration bat of claim 5, wherein, The support structure comprises a support seat and a stop plate, and the stop plate is mounted on the support seat. The connecting structure comprises a connecting plate and a clamping driving element, the connecting plate is connected with the support seat and is located at least partially on the same side of the stop plate in the support seat, can move close to or away from the stop plate, and surrounds the stop plate and the support seat to form the connecting channel, and the clamping driving element is connected with the connecting plate and drives the connecting plate to move close to or away from the stop plate.

7. The calibration bat of claim 6, wherein, The support seat is provided with a second screw hole extending along the arrangement direction of the connecting plate and the stop plate, and the connecting plate is provided with a matching hole corresponding to the second screw hole. The clamping driving element comprises a driving screw arranged in the matching hole and threadedly arranged in the second screw hole.

8. The calibration bat of claim 5, wherein, The mounting part is provided with at least two through holes corresponding to the at least two standard balls, each standard ball is provided with a mounting handle corresponding to the through hole, and the mounting handle has a threaded section arranged in the through hole. ​ 9. The calibration bat of claim 8, wherein, ​ ​ 10. The calibration bat of claim 1, wherein, ​ The calibration ball bat also corresponds to the standard ball includes at least two mounting nuts, each of the mounting nuts is screwed to the corresponding thread segment protruding from one end of the through hole.

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