Measuring Device for Clamping Force of Pneumatic Chuck Jaws

Abstract

The invention discloses a measuring device for the clamping force of a pneumatic chuck jaw. The scheme includes a pressure acquisition block, a pressure display device and a support frame. A slider is vertically and slidably connected to the support frame, and a positioning piece is arranged on the slider. The pressure acquisition block is connected to a connecting rod, and the connecting rod is rotatably connected to the slider. The pressure acquisition block includes a clamping block and a pressure sensing element. The pressure sensing element is arranged on the clamping block, and the pressure sensing element is electrically connected to the pressure display device. Two jaws clamp the clamping block and press against the pressure sensing element. The support frame assists in placing the pressure acquisition block, and through the positioning block, it is convenient to position the pressure acquisition block and the chuck jaw, reducing the error of manually placing the pressure acquisition block. During measurement, the jaws clamp the clamping block and press against the pressure sensing element, so as to measure the pressure exerted on the clamping block by the two jaws of the clamping force to be measured. The pressure measurement value is collected and displayed by the pressure display device, and the measurement is convenient, fast and safe.

Description

Technical Field

[0001] The present invention relates to the field of chuck auxiliary devices, and particularly to a measuring device for the clamping force of pneumatic chuck jaws. Background Art

[0002] A pneumatic chuck is a common auxiliary processing tool in the machining process. For example, in a laser pipe cutting machine, during the pipe cutting process, the chuck is used to clamp the pipe.

[0003] In the prior art, the structure of a chuck generally includes a chuck body, jaws, a driving cylinder, and a rotary driving motor. The jaws are arranged radially along the chuck body. The driving cylinder is used to drive the jaws to move radially along the chuck body to approach or move away from each other, and the rotary driving motor is used to drive the rotation of the chuck body.

[0004] Since the jaws move under the drive of the driving cylinder, the provision of the clamping force of the jaws is also related to the air pressure of the driving cylinder. By providing different air pressures to the driving cylinder, the clamping force between the paired jaws is different.

[0005] During the production process, for the clamping of pipes with different wall thicknesses and different stiffnesses, an appropriate clamping force needs to be provided, that is, an appropriate air pressure is provided to the driving cylinder. Otherwise, the pipe will be clamped unstably or deformed.

[0006] The current common method is to provide the working air pressure of the driving cylinder according to the experience of on-site workers, which will lead to the following problems: it is impossible to obtain the actual clamping force value generated by the provided working air pressure, so it is impossible to select the working air pressure parameters according to the conditions of different pipes, and the pneumatic chuck is a clamping tooling, and the manual operation is relatively dangerous.

[0007] Therefore, there is a need to provide a measuring device with high safety and convenient for measuring the clamping force value generated between the jaws under different air pressures. Summary of the Invention

[0008] In order to solve the above technical problems, the object of the present invention is to provide a measuring device for the clamping force of pneumatic chuck jaws, which includes a pressure acquisition block and a pressure display device, and the measuring device for the clamping force of pneumatic chuck jaws has the advantages of convenient and rapid measurement.

[0009] In order to achieve the above invention object, the technical solution adopted by the present invention is as follows:

[0010] Measuring device for clamping force of pneumatic chuck jaws, comprising a pressure acquisition block, a pressure display device and a support frame. A slider is vertically slidably connected to the support frame. A positioning piece that abuts against the surface of the chuck is provided on the slider. The pressure acquisition block is connected to a horizontally arranged connecting rod, and the connecting rod is rotatably connected to the slider. The pressure acquisition block includes a clamping block and a pressure sensing element. The two ends of the clamping block are adapted to the clamping surfaces of two jaws on the chuck for which the clamping force is to be measured. The pressure sensing element is arranged on the clamping block, and the pressure sensing element is electrically connected to the pressure display device. The two jaws clamp the clamping block and press against the pressure sensing element.

[0011] With such an arrangement, the pressure acquisition block is arranged on a slider, and the slider can slide vertically along the support frame. Then, by means of the positioning piece provided on the slider abutting against the chuck, the two clamping surfaces of the pressure acquisition block are made to face the jaws of the chuck. After positioning the pressure acquisition block in this way, it is possible to eliminate the need for manual placement of the pressure acquisition block between the jaws of the chuck for which the clamping force is to be measured, which is beneficial to improving the accuracy of placing the pressure acquisition block and enhancing the safety during measurement. The two ends of the clamping block are respectively adapted to the clamping surfaces of two jaws on the chuck for which the clamping force is to be measured. Thus, during measurement, the two jaws on the chuck for which the clamping force is to be measured can simultaneously clamp the two ends of the clamping block respectively. After the jaws clamp the clamping block, they press against the pressure sensing element. Thereby, the pressure sensing element measures the pressure exerted on the clamping block between the two jaws. Furthermore, the pressure data collected by the pressure sensing element is collected and displayed by the pressure display device connected to the pressure sensing element, so as to display the clamping force generated between the two jaws in real time, and the measurement is convenient and fast.

[0012] Preferably, the pressure sensing element is arranged on any one of the ends of the clamping block that abuts against the jaw.

[0013] With such an arrangement, the pressure sensing element is arranged on any one of the ends of the clamping block that abuts against the jaw. Thus, when the jaw clamps the clamping block, the jaw can directly abut against the pressure sensing element, with a simple structure and being convenient for machining and assembly.

[0014] Preferably, the clamping block includes a first block member and a second block member. A receiving groove is formed in the first block member. The second block member is slidably connected to the receiving groove. The pressure sensing element is arranged at the bottom of the receiving groove. The end of the second block member located inside the receiving groove abuts against the pressure sensing element.

[0015] By setting it in this way, the clamping block divides it into a first block and a second block. An accommodation groove is formed in the first block, and the pressure sensing element is arranged at the bottom of the accommodation groove. When the two jaws to be measured for the clamping force are in contact with and clamp the first block and the second block, the end of the second block in the accommodation groove is in contact with the contact groove of the pressure sensing element, so as to transmit the pressure applied by the jaws to the pressure sensing element. Thus, the pressure sensing element can collect the clamping force value generated between the two jaws. And setting the pressure sensing element in the accommodation groove, on the one hand, is to avoid the measurement end of the pressure sensing element being exposed outside the clamping block, reducing the possibility of its being damaged and affecting the accuracy; on the other hand, since the shape of the clamping surface of the jaws is set differently to adapt to pipes with different cross-sectional shapes, therefore, setting the force measuring sensing element in the accommodation groove, and through the cooperation of the first block, the second block and the clamping surface, it is possible to avoid the trouble of designing the structure of the force measuring sensing element and facilitate processing and production.

[0016] Preferably, an adjusting device is provided on the first block and / or the second block, and the adjusting device can adjust the distance between the surface of the first block in contact with the jaw and the surface of the second block in contact with the jaw.

[0017] By setting it in this way, an adjusting device is provided on the first block and / or the second block to adjust the distance between the surface of the first block in contact with the jaw and the surface of the second block in contact with the jaw. Thus, according to the clamping of pipes with different cross-sectional sizes simulated, the distance between the surface of the first block in contact with the jaw and the surface of the second block in contact with the jaw can be adjusted to the cross-sectional size of the pipe, so as to measure the clamping force generated when the same working air pressure is used to drive the chuck when clamping pipes with different cross-sectional sizes.

[0018] Preferably, the second block includes a sliding part and a supporting part. The sliding part is slidably connected to the accommodation groove. The adjusting device includes an external threaded column arranged on the supporting part and an internal threaded hole arranged on one end face of the sliding part. One end of the sliding part away from the internal threaded hole is in contact with the pressure sensing element, and the supporting part and the sliding part are threadedly connected through the external threaded column and the internal threaded hole.

[0019] By setting it in this way, the connection between the sliding part and the supporting part is realized through the threaded cooperation of the external threaded column and the internal threaded hole, and the overall length after the sliding part and the supporting part can be adjusted by adjusting the length of the cooperation between the external threaded column and the internal threaded hole, and further the distance between the surface of the first block in contact with the jaw and the surface of the second block in contact with the jaw can be adjusted. The structure is simple and the adjustment is convenient.

[0020] Preferably, the second block includes a sliding portion and a supporting portion, the adjusting device includes a connecting groove opened on the supporting portion, one end of the sliding portion is slidably connected to the accommodating groove, and the other end is slidably connected to the connecting groove, a first adjusting hole is opened on the supporting portion, the first adjusting hole is opened in a direction perpendicular to the connecting groove and is connected to the connecting groove, at least two second adjusting holes are opened on the sliding portion along its sliding direction, the second adjusting holes are adapted to the first adjusting hole, and the adjusting device also includes an adjusting connector, which is plugged into the first adjusting hole and one of the second adjusting holes.

[0021] Through such an arrangement, the sliding part is slidably connected to the supporting part through the connecting grooves on the sliding part, and the adjusting plug-in can be inserted into different second adjusting holes through the first adjusting hole to adjust the overall length of the sliding part after being connected to the supporting part. The spacing between the two adjusting holes can be set according to pipes of different specifications. Compared with threaded adjustment, the adjustment speed is fast.

[0022] Preferably, the first block includes a fixing portion and a connecting portion, the accommodating groove is provided on one end surface of the fixing portion, the adjusting device includes an adjusting threaded blind hole provided on the end surface of the fixing portion away from the accommodating groove, and an external threaded portion arranged at one end of the connecting portion, and the external threaded portion is threadedly connected to the adjusting threaded blind hole.

[0023] Through such an arrangement, the fixing part and the connecting part are connected to form a first piece through the threaded connection between the external threaded part and the adjusting threaded blind hole, and the overall length of the fixing part and the connecting part can be adjusted through the length of the matching between the external threaded part and the adjusting threaded blind hole, thereby adjusting the distance between the surface where the first piece and the claw abut against the surface where the second piece and the claw abut against the claw. The structure is simple and the adjustment is convenient.

[0024] Preferably, the support frame includes a support base and a vertical rod arranged on the support base, the vertical rod is provided with a lower limit block, the upper surface of the lower limit block abuts against the lower surface of the slider, the vertical rod is provided with an adjustment groove along the vertical direction, an adjustment block is slidably provided in the adjustment groove, and the lower limit block is provided with an adjustment screw threadedly connected to the adjustment block.

[0025] With such an arrangement, when the adjusting screw is tightened, the adjusting block and the adjusting groove are clamped to fix the position of the lower limit block on the vertical rod. When the position of the lower limit block needs to be adjusted, the adjusting screw can be loosened to facilitate the adjustment of the position of the lower limit block, thereby facilitating the placement of the pressure collection block in the center of the chuck, and facilitating the measurement of the clamping force of the jaws of chucks with different chuck center heights.

[0026] Preferably, a connection hole and a rotation groove communicating with the connection hole are formed in the slider. The rod body of the connecting rod is rotatably matched with the connection hole. A rotation part is arranged at the end of the connecting rod. The diameter of the rotation part is larger than the diameter of the connection hole and smaller than the diameter of the rotation groove. A limiting groove is further formed in the slider. The limiting groove is coaxially arranged with the connection hole. Two limiting concave holes are arranged at the bottom of the limiting groove. An annular guiding groove communicating the two limiting concave holes is further formed at the bottom of the limiting groove. The depth of the annular guiding groove is smaller than that of the limiting concave holes. One of the limiting concave holes is in the vertical direction, and the other limiting concave hole is in the horizontal direction. A guiding disc is arranged on the connecting rod along the circumferential direction. The guiding disc is rotatably matched with the limiting groove. An angular limiting protrusion which is clamped and matched with the limiting concave hole is arranged on one side surface of the guiding disc facing the limiting concave hole.

[0027] By such arrangement, when measuring the clamping force of one pair of jaws, the angular limiting protrusion is clamped and matched with one of the limiting concave holes, so as to fix the state of the connecting rod, and further fix the state of the pressure acquisition block. When it is necessary to measure the clamping force of the jaws in the other direction, the angular limiting protrusion is disengaged from the limiting concave hole, and then the connecting rod is rotated. The angular limiting protrusion slides in the annular guiding groove, so that the pressure acquisition block on the connecting rod rotates with the rotation of the connecting rod until the angular limiting protrusion is clamped with the other limiting concave hole, thereby fixing the state of the pressure acquisition block, which is convenient for measuring the clamping force of the other pair of jaws, and thus realizing the switching between the horizontal state and the vertical state of the pressure acquisition block.

[0028] Preferably, a mounting plate is arranged on the positioning piece along the radial direction of the chuck. A threaded adjusting rod is arranged on the positioning piece. A threaded connection hole is formed through the mounting plate. The opening direction of the threaded connection hole is parallel to the rod body direction of the connecting rod. The threaded adjusting rod is in threaded connection with the threaded connection hole. An adjusting nut is further in threaded connection with the threaded adjusting rod.

[0029] By such arrangement, by arranging the threaded adjusting rod, it is convenient to adjust the distance between the positioning piece and the slider, which is beneficial to improving the positioning accuracy of the pressure acquisition block and can be applicable to the positioning of the pressure acquisition block and the jaws of chucks of different models.

[0030] Compared with the prior art, the present invention has obtained beneficial technical effects:

[0031] 1. The pressure acquisition block is assisted to be placed through a support frame, and the positioning block arranged on the slider facilitates the positioning of the pressure acquisition block and the chuck jaws, reducing the error of manually placing the pressure acquisition block and improving the measurement safety. During measurement, the pressure acquisition block is placed between two jaws of the clamping force to be measured. The jaws clamp the clamping block and press against the pressure sensing element, thereby measuring the pressure exerted by the two jaws of the clamping force to be measured on the clamping block, obtaining the clamping force generated between the jaws, and then the pressure display device collects and displays the pressure measurement value. The measurement is convenient and fast, which can provide a reference for the clamping of pipes during the production process and is beneficial to improving production efficiency and quality.

[0032] 2. The pressure sensing element can be arranged at the end of the clamping block, with a simple structure and convenient for processing and assembly.

[0033] 3. The clamping block can be divided into two parts, namely the first block and the second block. The pressure sensing element is arranged inside the first block to protect the pressure sensing element and reduce the trouble of complex design of its own structure to adapt to the shape of the clamping surface of the jaws.

[0034] 4. By arranging an adjusting device on the first block and / or the second block to adjust the distance between the surface of the first block in contact with the jaws and the surface of the second block in contact with the jaws, the clamping force generated when the chuck is driven by the same working air pressure can be measured when clamping pipes with different cross-sectional sizes.

[0035] 5. By arranging a lower limit block and making the position of the lower limit block adjustable along the rod body direction of the vertical rod, it is convenient to adjust the position of the lower limit block to adapt to the measurement of the clamping force of the jaws of chucks with different center heights of the chuck.

[0036] 6. By arranging a limit concave hole in the arranged limit groove to cooperate with the angle limit protrusion at the end of the connecting rod, the switching between the horizontal state and the vertical state of the pressure acquisition block is realized, which is convenient for measuring the clamping force of the jaws located in the horizontal direction and the vertical direction respectively.

[0037] 7. By making the distance between the positioning piece and the slider adjustable, it is beneficial to make the measuring device applicable to the measurement of the jaws of different models of chucks. Description of the Drawings

[0038] Figure 1 is a three-dimensional schematic diagram when the measuring device for the clamping force of the pneumatic chuck jaws in Embodiment 1 of the present invention is in use;

[0039] Figure 2 is Figure 1 the enlarged view of part A in

[0040] Figure 3 is Figure 1Enlarged view of part B;

[0041] Figure 4 It is the front view when the measuring device for the clamping force of the pneumatic chuck jaws in Embodiment 1 of the present invention is in use;

[0042] Figure 5 It is the schematic plan view of the pressure acquisition block in Embodiment 1 of the present invention;

[0043] Figure 6 It is the schematic overall structure diagram of the measuring device for the clamping force of the pneumatic chuck jaws in Embodiment 1 of the present invention;

[0044] Figure 7 It is Figure 6 Enlarged view of part C;

[0045] Figure 8 It is the schematic internal structure diagram of the pressure acquisition block in Embodiment 1 of the present invention;

[0046] Figure 9 It is the schematic connection relationship diagram of the vertical rod and the lower limit block in Embodiment 1 of the present invention;

[0047] Figure 10 It is the front view of the first connecting block member in Embodiment 1 of the present invention;

[0048] Figure 11 It is the connection schematic diagram of the connecting rod with the first connecting block member and the second connecting block member in Embodiment 1 of the present invention;

[0049] Figure 12 It is the structural schematic diagram of the pressure acquisition block in Embodiment 2 of the present invention;

[0050] Figure 13 It is the structural schematic diagram of the pressure acquisition block in Embodiment 3 of the present invention;

[0051] Figure 14 It is the structural schematic diagram of the pressure acquisition block in Embodiment 4 of the present invention.

[0052] Among them, the technical features represented by each reference numeral are as follows:

[0053] 1. Pressure acquisition block; 101. Clamping block; 1011. Clamping groove; 1012. First block; 10121. Accommodation groove; 10122. Fixing part; 101221. Adjusting threaded blind hole; 10123. Connecting part; 101231. External threaded part; 1013. Second block; 10131. Sliding part; 101311. Internal threaded hole; 101312. Second adjusting hole; 10132. Supporting part; 101321. External threaded column; 101322. Connecting groove; 101323. First adjusting hole; 10133. Second limiting convex part; 102. Pressure sensing element; 2. Pressure display device; 3. Support frame; 301. Support base; 302. Vertical rod; 3021. Lower limiting block; 30211. Adjusting screw; 3022. Adjusting groove; 30221. Adjusting block; 4. Chuck body; 5. Chuck jaw; 501. Clamping surface; 6. Slide block; 601. Slide sleeve; 602. Connecting block; 6021. First connecting block part; 60211. Limiting groove; 60212. Limiting concave hole; 60213. Annular guiding groove; 6022. Second connecting block part; 60221. Rotating groove; 7. Positioning piece; 701. Threaded adjusting rod; 702. Adjusting nut; 8. Connecting rod; 801. Rotating part; 802. Guide disc; 8021. Angle limiting projection; 9. Mounting plate; 10. Adjusting plug-in part. Detailed implementation manners

[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. However, the scope of protection required by the present invention is not limited to the specific embodiments described below.

[0055] Embodiment 1

[0056] Refer to Figure 1 , in this embodiment, a measuring device for the clamping force of a pneumatic chuck jaw is disclosed, which includes a pressure acquisition block 1, a pressure display device 2 and a support frame 3. The chuck adopted in this embodiment includes a chuck body 4, a pair of chuck jaws 5 arranged in pairs and oppositely arranged on the chuck body 4, and a driving cylinder (not shown in the figure) for driving the pair of chuck jaws 5 to move towards or away from each other.

[0057] Refer to Figure 1 , Figure 2 and Figure 3 , a slide block 6 is slidably arranged on the support frame 3 in the vertical direction. A positioning piece 7 that abuts against the surface of the chuck body 4 is arranged on the slide block 6. A connecting rod 8 is connected to the pressure acquisition block 1. The connecting rod 8 is arranged horizontally, and the connecting rod 8 is rotatably connected to the slide block 6.

[0058] Refer to Figure 1 , Figure 4 and Figure 6, the pressure acquisition block 1 includes a clamping block 101 and a pressure sensing element 102. The two ends of the clamping block 101 are adapted to the clamping surfaces 501 of the two jaws 5 on the chuck for the clamping force to be measured. In this embodiment, clamping rollers (not labeled in the figure) are provided on the jaws 5, and the clamping surfaces 501 of the jaws 5 are the arc surfaces of the clamping rollers. Clamping grooves 1011 are respectively formed at the two ends of the clamping block 101 corresponding to the arc surfaces of the clamping rollers.

[0059] Reference Figure 1 , Figure 4 , Figure 5 And Figure 6 , the pressure sensing element 102 is arranged on the clamping block 101, and the pressure sensing element 102 is electrically connected to the pressure display device 2. During measurement, the two jaws 5 clamp the clamping block 101 and press against the pressure sensing element 102. Thus, the pressure display device 2 performs digital-to-analog conversion on the pressure sensing element 102, and then displays the pressure value (i.e., the clamping force value of the jaws 5).

[0060] Reference Figure 5 , Figure 6 And Figure 7 , in this embodiment, the clamping block 101 includes a first block 1012 and a second block 1013. A receiving groove 10121 is formed on the first block 1012, and the second block 1013 is slidably connected to the receiving groove 10121. The pressure sensing element 102 is arranged at the bottom of the receiving groove 10121, and the end of the second block 1013 located in the receiving groove 10121 abuts against the pressure sensing element 102.

[0061] Reference Figure 5 , in this embodiment, an adjusting device (not labeled in the figure) is arranged on the first block 1012 and / or the second block 1013. The adjusting device can adjust the distance between the surface of the first block 1012 abutting against the jaw 5 and the surface of the second block 1013 abutting against the jaw 5, such as the parameter H in the figure.

[0062] When the same air pressure is provided to the driving cylinder, the clamping forces generated between the jaws may be different when clamping pipes with different diameters. Therefore, an adjusting device is added to further be applicable to the measurement when clamping different diameters, and the applicability of the measurement device is improved.

[0063] Reference Figure 5 , Figure 6 And Figure 7, in this embodiment, the second block 1013 includes a sliding portion 10131 and a supporting portion 10132. The sliding portion 10131 is slidably connected to the receiving groove 10121. The cross-section of the receiving groove 10121 is circular, and the sliding portion 10131 is cylindrical. The adjusting device includes an external threaded column 101321 disposed on the supporting portion 10132 and an internal threaded hole 101311 disposed on one end surface of the sliding portion 10131. One end of the sliding portion 10131 away from the internal threaded hole 101311 abuts against the pressure sensing element 102. The supporting portion 10132 and the sliding portion 10131 are threadedly connected through the external threaded column 101321 and the internal threaded hole 101311. During adjustment, the end of the supporting portion 10132 away from the external threaded column 101321 is the end abutted by the claw 5, and a clamping groove 1011 is provided on this end. During the thread adjustment process, the angle of the clamping groove 1011 in the horizontal plane will change. By setting the cross-section of the receiving groove 10121 to be circular and the sliding portion 10131 to be cylindrical, it is convenient to adjust the direction of the clamping groove 1011 to be adapted to the direction of the arc surface of the clamping roller on the claw 5.

[0064] Reference Figure 8 , a first limiting protrusion portion (not marked in the figure) is provided on the inner wall of the receiving groove 10121, and a second limiting protrusion portion 10133 abutted against the first limiting protrusion portion is provided on the outer wall of one end of the second block in the receiving groove 10121. In this embodiment, the second limiting protrusion portion 10133 is provided on the sliding portion 10131.

[0065] Reference Figure 7 and Figure 8 , in this embodiment, the second limiting protrusion portion 10133 is provided on the outer wall of the sliding portion 10131, and the second limiting protrusion portion 10133 is arranged around the axis of the first sliding portion 10131 for one week.

[0066] In this embodiment, the pressure sensing element 102 is a pressure sensor in the prior art, and the pressure display device 2 selects an MCK-Z-I type high-precision intelligent display control instrument.

[0067] Reference Figure 1 , Figure 3 and Figure 9, the support frame 3 includes a support base 301 and a vertical rod 302 disposed on the support base 301. A lower limit block 3021 is provided on the vertical rod 302. The upper surface of the lower limit block 3021 abuts against the lower surface of the slider 6. The vertical rod 302 is provided with an adjustment groove 3022 in the vertical direction. An adjustment block 30221 is slidably disposed in the adjustment groove 3022. The adjustment groove 3022 is a T-shaped groove. The adjustment block 30221 is slidably engaged with the two side walls of the adjustment groove 3022. An adjustment screw 30211 that is threadedly connected to the adjustment block 30221 penetrates through the lower limit block 3021. After the adjustment screw 30211 is loosened, the adjustment block 30221 can be slid along the adjustment groove 3022 to adjust the vertical position of the adjustment block 30221, thereby adjusting the vertical position of the lower limit block 3021. After the adjustment screw is tightened, the adjustment block 30221 is fixed, thereby fixing the lower limit block 3021.

[0068] Reference Figure 1 , Figure 3 , the slider 6 includes a sliding sleeve 601 slidably connected to the vertical rod 302 and a connecting block 602 fixedly connected to the sliding sleeve 601. The connecting block 602 includes a first connecting block member 6021 and a second connecting block member 6022. The first connecting block member 6021 and the second connecting block member 6022 are connected by a threaded connecting member (not shown in the figure). The threaded connecting member can be a screw or a bolt-nut assembly;

[0069] Reference Figure 1 , Figure 3 , Figure 10 and Figure 11 , a connecting hole (not marked in the figure) is penetrated through the first connecting block member 6021. A rotating groove 60221 is provided on the second connecting block 602 corresponding to the connecting hole. The rod body of the connecting rod 8 is rotatably engaged with the connecting hole. A rotating portion 801 is provided at the end of the connecting rod 8. The diameter of the rotating portion 801 is larger than the diameter of the connecting hole and smaller than the diameter of the rotating groove 60221. A limiting groove 60211 is coaxially provided on the first connecting block member 6021 with the connecting hole. Two limiting concave holes 60212 are provided at the bottom of the limiting groove 60211. An annular guiding groove 60213 communicating the two limiting concave holes 60212 is further provided at the bottom of the limiting groove 60211. The depth of the annular guiding groove 60213 is smaller than that of the limiting concave hole 60212. One of the limiting concave holes 60212 is in the vertical direction, and the other limiting concave hole 60212 is in the horizontal direction. A guiding disk 802 is circumferentially provided on the connecting rod 8. The guiding disk 802 is rotatably engaged with the limiting groove 60211. An angular limiting protrusion 8021 is provided on the side surface of the guiding disk 802 facing the limiting concave hole 60212. The angular limiting protrusion 8021 is snap-fitted with the limiting concave hole 60212.

[0070] Reference Figure 1 and Figure 2, a mounting plate 9 is radially arranged along the chuck on the positioning piece 7. A threaded adjusting rod 701 is arranged on the positioning piece 7. A threaded connection hole (not shown in the figure) is penetrated through the mounting plate 9. The opening direction of the threaded connection hole is parallel to the rod body direction of the connecting rod 8. The threaded adjusting rod 701 is threadedly connected with the threaded connection hole, and an adjusting nut 702 is also threadedly connected on the threaded adjusting rod 701.

[0071] Embodiment 2

[0072] Reference Figure 12 , this embodiment discloses another measuring device for the clamping force of the pneumatic chuck jaws. Based on Embodiment 1, the difference between this embodiment and Embodiment 1 is that:

[0073] The clamping block 101 is integrally arranged. The pressure sensing element 102 can be arranged on any one end of the clamping block 101 in contact with the jaw. An installation hole (not marked in the figure) for installing the pressure sensing element 102 is opened on the end face of the clamping block 101 in contact with the jaw. The pressure sensing element 102 is fixed in the installation hole, and the detection end of the pressure sensing element 102 faces outside the installation hole and the detection end of the pressure sensing element 102 is higher than the end face of the clamping block 101 in contact with the jaw. Thus, when the jaw clamps the clamping block 101, between the jaw and the detection end of the pressure sensing element 102, the pressure sensing element 102 can collect the pressure exerted by the jaw on the clamping block 101, thereby measuring the clamping force of the jaw.

[0074] Embodiment 3

[0075] Reference Figure 13 , this embodiment discloses another measuring device for the clamping force of the pneumatic chuck jaws. Based on Embodiment 1, the difference between this embodiment and Embodiment 1 is that:

[0076] The adjusting device includes a connecting groove 101322 opened on the supporting part 10132. One end of the sliding part 10131 is slidably connected with the accommodating groove, and the other end is slidably connected with the connecting groove 101322. A first adjusting hole 101323 is opened on the supporting part 10132. The first adjusting hole 101323 is opened along the direction perpendicular to the connecting groove 101322 and communicates with the connecting groove 101322. In this embodiment, the first adjusting hole 101323 penetrates through the supporting part 10132.

[0077] At least two second adjustment holes 101312 are formed along the sliding direction of the sliding part 10131. The distance between the second adjustment holes 101312 can be set according to different commonly used pipe diameters. The second adjustment holes 101312 are adapted to the first adjustment holes 101323, and the size and shape of the second adjustment holes 101312 are the same as those of the first adjustment holes 101323. The adjusting device further includes an adjusting plug 10, and the adjusting plug 10 is inserted into the first adjustment hole 101323 and one of the second adjustment holes 101312. In this embodiment, the adjusting plug 10 passes through the first adjustment hole 101323 and the selected second adjustment hole 101312.

[0078] After the adjusting plug 10 is inserted into the first adjustment hole 101323 and one of the second adjustment holes 101312, the distance H between the surface of the first block 1012 in contact with the claw and the surface of the second block 1013 in contact with the claw is equal to the diameter of the pipe to be measured corresponding to the design.

[0079] Embodiment 4

[0080] Reference Figure 14 , this embodiment discloses another measuring device for the clamping force of the pneumatic chuck jaws. Based on Embodiment 1, the difference between this embodiment and Embodiment 1 is that:

[0081] The adjusting device is not provided on the second block, and the adjusting device is only provided on the first block.

[0082] The first block 1012 includes a fixing part 10122 and a connecting part 10123. A receiving groove (not shown in the figure) is formed on one end face of the fixing part 10122. The adjusting device includes an adjusting threaded blind hole 101221 formed on the end face of the fixing part 10122 facing away from the receiving groove and an external threaded part 101231 provided at one end of the connecting part 10123. The external threaded part 101231 is threadedly connected to the adjusting threaded blind hole 101221.

[0083] Embodiment 5

[0084] Based on Embodiment 4, the difference between this embodiment and Embodiment 4 is that:

[0085] The adjusting device includes both the external threaded column on the supporting part and the internal threaded hole formed on one end face of the sliding part in Embodiment 1, and the adjusting threaded blind hole formed on the fixing part and the external threaded part provided on the connecting part in Embodiment 4. Thus, the lengths of both the first block and the second block can be adjusted, and it is easier to adjust the distance between the surface of the first block in contact with the claw and the surface of the second block in contact with the claw to measure the clamping force generated by the jaws when clamping pipes with different diameters.

[0086] Embodiment 6

[0087] This embodiment discloses a method for measuring the clamping force of the chuck jaws based on any one of the above-mentioned measuring devices, including:

[0088] S1: Reset the chuck to separate the two jaws with the clamping force to be measured that are oppositely arranged;

[0089] S2: Adjust the distance between the positioning piece and the slider. After the positioning piece abuts against the chuck body, the clamping block is aligned with the chuck jaws. Then, adjust the height of the lower limit block so that the clamping block is placed between the two jaws of the chuck with the clamping force to be measured;

[0090] S3: Actuate the chuck so that the two jaws respectively clamp both ends of the clamping block and press against the pressure sensing element;

[0091] S4: The pressure display device receives the pressure signal collected by the pressure sensing element and displays the pressure value, completing the measurement of the clamping force.

[0092] An adjustment step S1-1 can also be set between S1 and S2: By means of an adjustment device, adjust the distance between the surfaces of both ends of the clamping block that abut against the jaws so that it is equal to the diameter of the pipe to be clamped; thereby, the magnitude of the clamping force of the jaws on pipes with different diameters under the same working air pressure can be measured.

[0093] When it is necessary to measure the clamping force of a pair of jaws in another direction, rotate the connecting rod so that the angle limiting protrusion disengages from the limiting concave hole. The angle limiting protrusion slides in the annular guiding groove, so that the pressure acquisition block on the connecting rod rotates as the connecting rod rotates until the angle limiting protrusion engages with another limiting concave hole to fix the state of the pressure acquisition block. Then, according to the above steps S3 and S4, measure the clamping force of the other pair of jaws, thereby realizing the switching between the horizontal state and the vertical state of the pressure acquisition block and measuring the clamping force of the jaws in the horizontal direction and the jaws in the vertical direction.

[0094] According to the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above-mentioned embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the invention.

Claims

1. Measuring device for clamping force of pneumatic chuck jaws, characterized in that, It includes a pressure collection block, a pressure display device and a support frame, wherein a slider is vertically slidably connected to the support frame, and a positioning plate abutting the surface of the chuck is arranged on the slider, the pressure collection block is connected to a horizontally arranged connecting rod, and the connecting rod is rotatably connected to the slider, the pressure collection block includes a clamping block and a pressure sensing element, the two ends of the clamping block are adapted to the clamping surfaces of two claws of the chuck to be measured for the clamping force, the pressure sensing element is arranged on the clamping block, the pressure sensing element is electrically connected to the pressure display device, and the two claws clamp the clamping block and press the pressure sensing element.

2. The measuring device for the clamping force of the pneumatic chuck jaws according to claim 1, characterized in that, The pressure sensing element is arranged on any one end portion of the clamping block abutting against the clamping claw.

3. The measuring device for the clamping force of the pneumatic chuck jaws according to claim 1, characterized in that, The clamping block includes a first block and a second block. The first block is provided with a receiving groove. The second block is slidably connected to the receiving groove. The pressure sensing element is arranged at the bottom of the receiving groove. The end of the second block located in the receiving groove abuts against the pressure sensing element.

4. The measuring device for the clamping force of the pneumatic chuck jaws according to claim 3, characterized in that, An adjusting device is arranged on the first block and / or the second block, and the adjusting device can adjust the distance between the surface of the first block abutting against the claw and the surface of the second block abutting against the claw.

5. The measuring device for the clamping force of the pneumatic chuck jaws according to claim 4, characterized in that, The second block includes a sliding part and a supporting part, the sliding part is slidably connected to the accommodating groove, the adjusting device includes an external threaded column arranged on the supporting part and an internal threaded hole arranged on one end face of the sliding part, the end of the sliding part away from the internal threaded hole abuts against the pressure sensing element, and the supporting part and the sliding part are threadedly connected to the internal threaded hole through the external threaded column.

6. The measuring device for the clamping force of the pneumatic chuck jaws according to claim 4, characterized in that, The second block includes a sliding portion and a supporting portion, the adjusting device includes a connecting groove opened on the supporting portion, one end of the sliding portion is slidably connected to the accommodating groove, and the other end is slidably connected to the connecting groove, a first adjusting hole is opened on the supporting portion, the first adjusting hole is opened in a direction perpendicular to the connecting groove and is connected to the connecting groove, at least two second adjusting holes are opened on the sliding portion along its sliding direction, the second adjusting holes are adapted to the first adjusting hole, and the adjusting device also includes an adjusting connector, which is plugged into the first adjusting hole and one of the second adjusting holes.

7. The measuring device for the clamping force of the pneumatic chuck jaws according to claim 4, characterized in that, The first block includes a fixing portion and a connecting portion, the receiving groove is provided on one end surface of the fixing portion, the adjusting device includes an adjusting threaded blind hole provided on the end surface of the fixing portion away from the receiving groove, and an external threaded portion provided on one end of the connecting portion, the external threaded portion being threadedly connected to the adjusting threaded blind hole.

8. The measuring device for the clamping force of the pneumatic chuck jaws according to any one of claims 1-7, characterized in that, The support frame includes a support base and a vertical rod arranged on the support base, a lower limit block is arranged on the vertical rod, the upper surface of the lower limit block abuts against the lower surface of the slider, the vertical rod is provided with an adjustment groove along the vertical direction, an adjustment block is slidably arranged in the adjustment groove, and an adjustment screw threadedly connected to the adjustment block is passed through the lower limit block.

9. The measuring device for the clamping force of the pneumatic chuck jaws according to claim 8, characterized in that, A connecting hole and a rotating groove communicating with the connecting hole are formed in the slider. The rod body of the connecting rod is rotatably matched with the connecting hole. A rotating part is arranged at the end of the connecting rod. The diameter of the rotating part is larger than the diameter of the connecting hole and smaller than the diameter of the rotating groove. A limiting groove is further formed in the slider. The limiting groove is coaxially arranged with the connecting hole. Two limiting concave holes are arranged at the bottom of the limiting groove. An annular guiding groove communicating the two limiting concave holes is further formed at the bottom of the limiting groove. The depth of the annular guiding groove is smaller than that of the limiting concave hole. One of the limiting concave holes is in the vertical direction, and the other limiting concave hole is in the horizontal direction. A guiding disc is arranged on the connecting rod along the circumferential direction. The guiding disc is rotatably matched with the limiting groove. An angular limiting protrusion which is clamped and matched with the limiting concave hole is arranged on one side surface of the guiding disc facing the limiting concave hole.

10. The measuring device for the clamping force of the pneumatic chuck jaws according to any one of claims 1 to 7, characterized in that, An installation plate is arranged on the positioning piece along the radial direction of the chuck. A threaded adjusting rod is arranged on the positioning piece. A threaded connection hole is formed through the installation plate. The opening direction of the threaded connection hole is parallel to the rod body direction of the connecting rod. The threaded adjusting rod is in threaded connection with the threaded connection hole. An adjusting nut is further in threaded connection with the threaded adjusting rod.

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