Cutter fixing device of cutter run-out measuring instrument

Abstract

The utility model discloses a cutter fixing device of a cutter run-out measuring instrument. The tool fixing device comprises a base and at least two sets of jacking assemblies arranged in the base. The base is provided with a cutter assembly and at least provided with two second grooves. The jacking assembly is fixedly contained in the second groove and comprises a shell and a jacking piston. The jacking piston is movably arranged in the shell and can abut against the tool assembly, a gas slide valve used for controlling high-pressure gas to enter the jacking assembly is installed on the base, one end of the gas slide valve is connected with a high-pressure gas source, and the other end of the gas slide valve is fixedly connected with the jacking assembly. When the gas slide valve is opened, high-pressure gas enters the jacking assembly and pushes the jacking piston to slide in the shell so as to jack the cutter assembly. The blind rivet fixing device is simple in structure, low in cost, convenient to maintain and replace, applicable to blind rivets of various specifications and high in adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools, in particular to a tool fixing device of a tool runout measuring instrument. Background Art

[0002] In machining, the radial runout of rotating tools has a great impact on the tool life and workpiece machining accuracy. Especially in high-speed machining, in order to extend the tool life and machining accuracy requirements, it is necessary to detect the tool runout data.

[0003] In the prior art, in order to ensure that the tool remains fixed during the measurement process and does not deviate or float, there are two main ways to fix the tool in the tool runout measuring instrument. One is to use a vacuum generator to adsorb and lock the pull pin, but this fixing method is expensive; the other is based on the principle of a single-acting cylinder. The cylinder inputs compressed air at the air port at one end of the end cover to extend the piston, push the pull rod, pressure rod and other parts, so that the six hooks disengage the tool handle, and the other end relies on the spring force to restore the piston rod to its initial position, and the six hooks lock the tool handle. However, this fixing method has a complex structure, the locking effect is not obvious, and it is inconvenient to use and maintain. In addition, the spindle pull pins currently in use are of various specifications, and there is a problem of matching the hooks and pull pins during use. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the utility model provides a tool fixing device for a tool runout measuring instrument. The tool fixing device has a simple structure and is easy to repair and replace.

[0005] The utility model is achieved through the following technical solutions:

[0006] A tool fixing device for a tool runout measuring instrument, the tool fixing device comprising a base and at least two sets of tightening assemblies disposed within the base, the base being provided with a tool assembly and having at least two second grooves, the tightening assemblies being fixedly received within the second grooves and comprising a housing and a tightening piston, the tightening piston being movably disposed within the housing and capable of tightening the tool assembly, an air slide valve being mounted on the base for controlling high-pressure gas from entering the tightening assembly, one end of the air slide valve being connected to a high-pressure gas source and the other end being fixedly connected to the tightening assembly;

[0007] When the air slide valve is opened, high-pressure gas enters the tightening assembly and pushes the tightening piston to slide in the housing to tighten the tool assembly.

[0008] Furthermore, at least two tightening assemblies are evenly distributed along the circumferential direction of the axis of the tool assembly.

[0009] Furthermore, the shell is provided with an accommodating cavity, in which the tightening piston is movably accommodated. The outer sleeve of the tightening piston is provided with a second elastic member, one end of the second elastic member abuts against the second boss of the tightening piston, and the other end abuts against the third boss of the shell.

[0010] Furthermore, the shell is provided with an air port, and a high-pressure air cavity for accommodating high-pressure gas is provided inside the shell. The air port is connected to the high-pressure air cavity, and the air slide valve is fixedly connected to the air port through an air pipe. The high-pressure gas enters the high-pressure air cavity through the air port, thereby pushing the pressing piston to move.

[0011] Furthermore, the tool assembly includes a pull nail, and the shell is provided with a fourth through hole. The head of the tightening piston passes through the fourth through hole and points to the pull nail. When the high-pressure gas enters the high-pressure gas chamber, the head abuts against the pull nail.

[0012] Furthermore, the head has a conical tip and is made of steel.

[0013] Furthermore, the tightening piston also includes a tail portion, and the second boss and the tail portion are both movable and abut against the inner wall of the accommodating cavity, and an annular groove is formed between the second boss and the tail portion, and a sealing member is provided in the annular groove.

[0014] Furthermore, the tool fixing device also includes a fixing seat and a retaining frame. The fixing seat is provided with a third groove for placing the tool assembly. The retaining frame is arranged between the fixing seat and the tool assembly. The retaining frame is accommodated in the third groove and the outer wall of the retaining frame abuts against the inner wall of the third groove. The tool assembly is installed on the retaining frame and abuts against the inner wall of the retaining frame.

[0015] Furthermore, the fixing seat and the retaining frame are both made of steel.

[0016] Furthermore, a dust cover is installed on the base.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. The air slide valve is used to control the extension and contraction of the tightening piston to tighten and loosen the pull nail, preventing the tool from floating upward during the measurement process. It has a simple structure, low cost, easy maintenance and replacement, and is suitable for various types of pull nails with strong adaptability.

[0019] 2. By symmetrically arranging a pair of identical tightening components on both sides of the tool, when the pull nail is locked, the force is evenly distributed and no deviation occurs.

[0020] 3. The use of steel fixing seat and retainer can prevent the tool handle from wearing during the measurement process, which will affect the accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of a tool runout measuring instrument according to an embodiment of the present invention;

[0022] Figure 2 It is a right side view of the vertical moving device and the measuring device;

[0023] Figure 3 for Figure 1 Cross-sectional view along AA;

[0024] Figure 4 for Figure 3 Enlarged view of middle B;

[0025] Figure 5 It is a three-dimensional assembly drawing of the measuring device;

[0026] Figure 6 is a top view of the tool fixing device;

[0027] Figure 7 This is an exploded view of the tool fixing device;

[0028] Figure 8 for Figure 6 Cross-sectional view along CC;

[0029] Figure 9 This is an exploded view of the jacking assembly;

[0030] Figure 10 for Figure 7 Enlarged view of middle D;

[0031] Figure 11 This is a motion state diagram of a tool runout measuring instrument according to an embodiment of the present utility model;

[0032] Figure 12 This is another motion state diagram of the tool runout measuring instrument according to one embodiment of the present utility model;

[0033] Figure 13 The diagram of the relaxed state of the tightening component

[0034] Figure 14 This is a diagram of the tightening status of the tightening component.

[0035] Explanation of reference numerals: 1. Switching device; 11. Sliding assembly; 112. First slide rail; 113. Second slide rail; 114. First slider; 115. Second slider; 116. Pulley; 117. Connecting wire; 118. Counterweight; 120. Fine-tuning hand wheel; 121. Bearing; 122. Lead screw; 124. Connecting sleeve; 125. Second through hole; 126. Threaded groove; 131. Latch; 132. Lock tongue; 1 33. First elastic member; 134. First boss; 14. Fixing frame; 140. Fixing plate; 141. Connecting plate; 142. First through hole; 2. Measuring device; 21. Meter frame assembly; 210. Connecting block; 211. Bracket; 212. Third through hole; 213. Connecting ring; 214. Fourth groove; 215. Handle; 216. Fifth through hole; 217. Fifth groove; 22. Meter assembly; 220. Fine-tuning slide; 221, fine-tuning knob; 222, fixing seat; 223, dial indicator; 224, needle; 3, tool fixing device; 30, base; 300, first groove; 301, second groove; 31, fixing seat; 32, retaining frame; 33, tightening assembly; 330, housing; 331, tightening piston; 332, tail cover; 333, second elastic member; 334, fourth through hole; 335, head; 33 6. Air hole; 337. Second boss; 338. Third boss; 339. Receiving groove; 340. Fourth boss; 34. Air slide valve; 341. Receiving chamber; 342. High-pressure air chamber; 343. Tail; 344. Ring groove; 345. Seal; 35. Dust cover; 5. Base; 7. Tool assembly; 71. Tool body; 72. Handle; 73. Taper handle; 74. Pull nail; 741. Taper surface; L, axis. DETAILED DESCRIPTION

[0036] The following is a further non-restrictive detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. In the description of the utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model.

[0037] As Figure 1 shown, the tool run-out measuring instrument of the embodiment of the utility model, including switching device 1, measuring device 2, a pair of tool fixing device 3 and base 5. Switching device 1 is fixedly connected with measuring device 2 and drives measuring device 2 to move along the vertical direction, and vertical movement device 1 is fixedly connected with base 5. Measuring device 2 includes a pair of gauge assembly 22 installed on connecting block 210, and the pair of tool fixing device 3 and the pair of gauge assembly 22 are symmetrically arranged on the two sides of switching device.

[0038] As Figures 2 to 3 shown, the tool run-out measuring instrument includes fixed frame 14 and measuring device 2 for measuring tool run-out parameter. Switching device 1 includes fine adjustment hand wheel 120, lead screw 122, sliding assembly 11 and latch 131. Measuring device 2 includes connecting block 210 and handle 215 fixedly connected with connecting block 210. Fine adjustment hand wheel 120 is matched with lead screw 122, and lead screw 122 is rotatably supported on fixed frame 14. Connecting block 210 is slidably sleeved on lead screw 122. Latch 131 is slidably accommodated in connecting block 210 and threadedly matched with lead screw 122 in plug-in manner. Sliding assembly 11 is supported on fixed frame 14 and includes counterweight 118, and counterweight 118 is fixedly connected with connecting block 210 through connecting line 117 and drives connecting block 210 to move through its own gravity. When fast adjustment is needed, handle 215 is held and latch 131 is pulled out from the outside of connecting block 210, so that latch 131 is separated from lead screw 122, and counterweight 118 drives measuring device 2 to move up and down along lead screw 122 quickly. When fine adjustment is needed, latch 131 is inserted into connecting block 210 and matched with lead screw 122, and fine adjustment hand wheel 120 is rotated to drive measuring device 2 to move up and down along lead screw 122 to realize fine adjustment. By arranging lead screw 122, plug-in latch 131 and fine adjustment hand wheel 120 through switching device 1, measuring device 2 can be switched between fast adjustment and fine adjustment, which is simple in structure and convenient and fast.

[0039] Switching device further includes bearing 121. One end of lead screw 122 is supported on fixed frame 14 through bearing 121, and fine adjustment hand wheel 120 is located above bearing 121 and is fixedly sleeved on lead screw 122. Specifically, fixed frame 14 includes fixed plate 140 and connecting plate 141, and fixed plate 140 and connecting plate 141 are fixedly connected through screws. First through hole 119 is formed in the front end of fixed plate 140, bearing 121 is installed in first through hole 119, and the upper end portion of lead screw 122 is accommodated in bearing 121 and cooperates with bearing 121. The top end of lead screw 122 is fixedly connected with fine adjustment hand wheel 120.

[0040] The switching device also includes a connecting sleeve 124. The connecting block 210 defines a fifth through-hole 216, into which the connecting sleeve 124 is fixedly received and slidably mounted on the lead screw 122. The connecting block 210 also defines a fourth groove 214, into which the latch 131 is slidably received. The inner wall of the fourth groove 214 defines a third through-hole 212, and the connecting sleeve 124 defines a second through-hole 125. The locking tongue 132 of the latch 131 passes through both the third through-hole 212 and the second through-hole 125, allowing for removable engagement with the threaded groove 126 of the lead screw 122.

[0041] Measuring device 2 also includes a connecting ring 213, which is secured to and secured by the fourth groove 214 and sleeved onto the latch 131. A first elastic member 133 is sleeved around the latch 131. The first elastic member 133 is received within the fourth groove 214, with one end engaging the first boss 134 of the latch 131 and the other end engaging the connecting ring 213. Specifically, when the switching device is in the fine-tuning state, the latch 131 maintains the locking tongue 132 within the threaded groove 126 under the elastic force of the first elastic member 133. When the latch 131 is pulled to overcome the elastic force of the first elastic member 133, the locking tongue 132 disengages the threaded groove 126, and the switching device transitions from the fine-tuning state to the rapid-adjusting state. The first elastic member 133 is a return spring.

[0042] The sliding assembly 11 also includes a first slide rail 112 and a first slider 114. The first slide rail 112 is disposed on one side of the fixed frame 14. The first slider 114 is slidably connected to the first slide rail 112. The first slider 114 is fixedly connected to the connecting block 210. The sliding assembly 11 also includes a pair of pulleys 116. A connecting wire 117 can slide around the pulleys 116, with one end fixedly connected to the counterweight 118 and the other end passing through the pulleys 116 and fixedly connected to the connecting block 210. The counterweight 118 drives one end of the connecting wire 117 downward under its own gravity, and the other end of the connecting wire 117 slides upward around the pulley 116, thereby driving the connecting block 210 upward. The pair of pulleys 116 are fixedly supported on the fixed frame 14 and are respectively located above the first slide rail 112 and the second slide rail 113. The sliding assembly 11 also includes a second rail 113 and a second slider 115. The second rail 113 is mounted on the other side of the fixed frame 14. The second slider 115 is slidably connected to the second rail 113. A counterweight 118 is fixed to the second slider 115. The first rail 112 is fixedly connected to the side of the connecting plate 141 near the fine-tuning assembly 12 via screws. The second rail 113 is fixedly connected to the side of the connecting plate 141 away from the fine-tuning assembly 12 via screws. The first rail 112 and the second rail 113 are symmetrical about the connecting plate 141. Specifically, a pair of pulleys 116 are fixedly connected to the bottom of the fixed plate 130 via steel cables. In this embodiment, the pulleys 116 are preferably fixed pulleys. In this embodiment, the connecting wire 117 is preferably a rubber-coated steel wire. One end of the connecting wire 117 is placed on the front side of the connecting plate 131 and fixedly connected to the measuring device 2. The other end passes through the pulleys 116 and is placed on the rear side of the connecting plate 131 and fixedly connected to the top of the counterweight 118. The sidewalls of counterweight 118 are fixedly connected to second slider 115 via screws. The weight of counterweight 118 should be equal to or greater than the weight of measuring device 2. Using connecting wire 117, counterweight 118 and measuring device 2 are secured to either side of pulley 116. Under its own weight, counterweight 118 drives one end of connecting wire 117 downward, while the other end of connecting wire 117 slides upward around pulley 116, driving measuring device 2 upward. This allows measuring device 2 to be secured to the upper end of switching device 1 without manual intervention, saving manpower.

[0043] like Figure 4 and Figure 5As shown, the measuring device 2 includes a meter frame assembly 21 and a pair of gauge assemblies 22. The meter frame assembly 21 includes a bracket 211. The rear side of the connecting block 210 is fixedly connected to the first slider 114 by screws. The bracket 211 is fixedly connected to the connecting block 210 by screws. A handle 215 is fixedly connected to the middle part of the bracket 211 by screws. During movement, holding the handle 215 can manually control the speed of movement to prevent damage to the equipment or tool assembly 7 due to excessive speed. A pair of gauge assemblies 22 are respectively arranged at both ends of the bracket 211. The gauge assembly 22 includes a fine-tuning slide 220, a fine-tuning knob 221 matched with the fine-tuning slide 220, a fixing seat 222, and a dial indicator 223. The bottom surface of the fine-tuning slide 220 is fixedly connected to the bracket 211 by screws, and the upper surface is fixedly connected to the fixing seat 222 by screws. The dial indicator 223 is fixedly connected to the fixing seat 222 by screws. By setting the fine adjustment slide 220, the positions of the dial indicator 223 and the tool body 71 are adjusted before and after the measurement, so that the dial indicator 223 is away from the tool body 70, preventing the dial indicator 223 from colliding with the tool body 71 and affecting the measurement accuracy.

[0044] like Figures 6 to 10 As shown, a pair of tool holders 3 are disposed on either side of the switching device 1 and aligned with the table frame assembly 21. One tool holder 3 is suitable for holding a BT30 tool assembly 7, while the other is suitable for holding a BT40 tool assembly 7. The tool holders comprise a base 30 and at least two sets of clamping assemblies 33 disposed within the base 30. The base 30 is mounted with the tool assembly 7 and defines at least two second recesses 301. The clamping assemblies 33 are fixedly received within the second recesses 301 and comprise a housing 330 and a clamping piston 331. The clamping piston 331 is movably disposed within the housing 330 and is configured to clamp the tool assembly 7. An air slide valve 34 is mounted on the base 30 to control the flow of high-pressure gas into the clamping assemblies 33. One end of the air slide valve 34 is connected to a high-pressure gas source, and the other end is fixedly connected to the clamping assembly 33. When the air slide valve 34 is opened, high-pressure gas enters the clamping assembly 33 and pushes the clamping piston 331 to slide within the housing 330, thereby clamping the tool assembly 7. Among them, at least two tightening assemblies 33 are evenly distributed along the circumferential direction of the axis L of the tool body 71. Specifically, in this embodiment, the number of the at least two tightening assemblies 33 is preferably two, the number of the second grooves 301 and the tightening assemblies 33 is equal, and the shell 330 is fixedly connected to the side wall of the second groove 301 by screws. Among them, the air slide valve 34 is fixedly connected to the outer wall of the base 30 by screws. The two tightening assemblies 33 are symmetrical about the axis L of the tool assembly 7. By symmetrically arranging a pair of identical tightening assemblies 33 on both sides of the tool 7, when the pull pin 74 is locked, the force is evenly distributed and no offset occurs.

[0045] The shell 330 is provided with an air port 336, and a high-pressure air chamber 342 for accommodating high-pressure gas is provided inside the shell 330. The air port 336 is connected to the high-pressure air chamber 342, and the air slide valve 34 is fixedly connected to the air port 331 through an air pipe (not shown in the figure). The high-pressure gas enters the high-pressure air chamber 342 through the air port 336, thereby pushing the pressing piston 331 to move.

[0046] The housing 330 defines a receiving chamber 341, in which the pressing piston 331 is movably received. A second elastic member 333 is sheathed around the pressing piston 331, one end of the second elastic member 333 abuts against the second boss 337 of the pressing piston 331, and the other end abuts against the third boss 338 of the housing 330.

[0047] The tool assembly 7 includes a pull pin 74, and the housing 330 is provided with a fourth through hole 334. The head 335 of the tightening piston 331 passes through the fourth through hole 334 and points to the pull pin 74. When high-pressure gas enters the high-pressure gas chamber 342, the head 335 abuts against the pull pin 74. The head 335 has a conical tip and is made of steel. The tightening piston 331 also includes a tail 343. The second boss 337 and the tail 343 are both movably abutted against the inner wall of the accommodating chamber 341, and an annular groove 344 is formed between the second boss 337 and the tail 343. A sealing member 345 is sleeved on the annular groove 344. The sealing member 345 abuts against the side wall of the annular groove 344 and the inner wall of the accommodating chamber 341 at the same time. In this embodiment, the sealing member 345 is preferably a sealing ring.

[0048] When the tightening piston 331 is relaxed, the elastic force of the second elastic member 333 causes the head 335 of the tightening piston 331 to move away from the pull pin 74. When high-pressure gas drives the tightening piston 331 to overcome the elastic force of the second elastic member 333, the head 335 contacts the tapered surface 741 of the pull pin 74, transitioning the tightening piston 331 from a relaxed state to a tightened state. By using the heads 335 of the two tightening pistons 331 to simultaneously press against the tapered surface 741 of the pull pin 74 from both sides, auxiliary tool locking is achieved, enhancing measurement accuracy. By using the air slide valve 34 to push the tightening piston 331 to tighten and loosen the pull pin 74, this prevents the tool assembly 7 from floating upward during measurement. This simple structure, low cost, and ease of maintenance and replacement are all essential features. Furthermore, it is adaptable to various pull pin models and offers high adaptability.

[0049] like Figure 7As shown, the base 30 is fixedly connected to the base 5 by screws, and a first groove 300 is provided on the upper surface of the base 30. The tool fixing device also includes a fixed seat 31 and a holder 32. A third groove 310 for placing the tool assembly 7 is provided on the fixed seat 31, and the holder 32 is arranged between the fixed seat 31 and the tool assembly 7. The holder 32 is accommodated in the third groove 310 and the outer wall of the holder 32 abuts the inner wall of the third groove. The tool assembly 7 is mounted on the holder 32 and abuts the inner wall of the holder 32. Among them, the fixed seat 31 is accommodated in the first groove 300, the outer wall of the fixed seat 31 abuts the inner wall of the first groove 300, and the fixed seat 31 is fixedly connected to the base 30 by screws. The fixed seat 31 and the holder 32 are both made of steel. By adopting the steel fixed seat 31, the holder 32 and the tip 335, the tapered shank 73 is prevented from wearing during the measurement process, thereby affecting the accuracy.

[0050] A dust cover 35 is also installed on the base 30. Specifically, the base 30 is also fixedly connected with the dust cover 35 by screws, and the dust cover 35 can be covered on the fixing base 31 to reduce the risk of reduced accuracy caused by dust entering for a long time without use.

[0051] like Figures 11 to 14 As shown, during use, hold the handle 215 and pull the latch 131 with your index finger. Once the locking tongue 132 disengages the threaded groove 126, move the measuring device 2 to its highest point to minimize interference when installing the tool assembly 7. Place the tool assembly 7 into the tool fixture 3 and activate the air slide valve 34. High-pressure gas enters the housing 330, pushing the locking piston 331 and assisting in locking the tool 7. Pull down the handle 215, moving the measuring device 2 downward until the dial indicator 223 is close to the tool body 71. Release the latch 131. The locking tongue 132, under the action of the first elastic member, returns to its original position and inserts into the threaded groove 126. Manually adjust the Z-axis fine-tuning knob 120 to fine-tune the distance between the needle 224 of the dial indicator 223 and the tool body 71. Then, manually adjust the fine-tuning knob 221. The fine-tuning slide 220 drives the dial indicator 223 until the needle 224 contacts the outer surface 710 of the tool body 71. Grip handle 72 and manually rotate tool assembly 7. Observe the changes in the number on needle 224 to determine the runout value of tool body 70. When measurement is complete, turn fine-adjustment knob 221 to move dial indicator 223 away from tool body 71. Pull latch 131, raise measuring device 2 upward, release air slide valve 34, and remove tool assembly 7. If not in use for an extended period, replace dust cover 35 to reduce the risk of accuracy loss.

[0052] A tool runout measuring instrument according to one embodiment of the present invention utilizes a pair of tool fixing devices 1 and a pair of gauge assemblies 21 on a single device, minimizing the need for off-site pre-measurement of tool runout for the most common BT30 and BT40 tool assemblies on the same device. This reduces costs and improves device utilization. A switching device 1, provided with a lead screw 122, a pluggable latch 131, and a fine-tuning handwheel 120, allows the measuring device 2 to switch between two operating modes: rapid adjustment and fine-tuning. The structure is simple, convenient, and quick. A counterweight 118 and the measuring device 2 are secured to either side of a pulley 116 using a connecting wire 117. Under its own weight, the counterweight 118 drives one end of the connecting wire 117 downward, while the other end of the connecting wire 117 slides upward around the pulley 116, thereby driving the measuring device 2 upward. This allows the measuring device 2 to be secured to the upper end of the switching device 1, eliminating the need for manual fixation and saving manpower. A first elastic member 133 is provided on the latch 131 to provide reset and ensure that the latch 131 is securely pressed against the threaded groove 126. By using an air slide valve 34 to control high-pressure gas to push the tightening piston 331 to tighten and loosen the pull pin 74, the tool 7 is prevented from floating upward during measurement. This system features a simple structure, low cost, easy maintenance and replacement, and is suitable for a variety of pull pin models, offering strong adaptability. By symmetrically placing a pair of identical tightening assemblies 33 on either side of the tool 7, the pull pin 74 is evenly stressed and prevents deviation when tightened. The use of a steel mounting base 31 and retaining bracket 32 ​​prevents wear of the tapered shank 73 during measurement, which could affect accuracy. A fine-tuning slide 220 is provided to adjust the position of the dial indicator 223 and the tool body 71 before and after measurement, keeping the dial indicator 223 away from the tool body 71 and preventing collisions that could affect measurement accuracy. A dust cover 35 is provided to cover the mounting base 31 when the device is not in use for extended periods, reducing the risk of reduced accuracy due to dust intrusion.

[0053] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A tool fixing device for a tool runout measuring instrument, characterized in that: The tool fixing device comprises a base (30) and at least two sets of tightening assemblies (33) arranged in the base (30); the base (30) is installed with a tool assembly (7) and has at least two second grooves (301); the tightening assembly (33) is fixedly accommodated in the second groove (301) and comprises a shell (330) and a tightening piston (331); the tightening piston (331) is movably arranged in the shell (330) and can tighten the tool assembly (7); an air slide valve (34) for controlling high-pressure gas to enter the tightening assembly (33) is installed on the base (30); one end of the air slide valve (34) is connected to a high-pressure gas source, and the other end is fixedly connected to the tightening assembly (33); When the air slide valve (34) is opened, the high-pressure gas enters the tightening assembly (33) and pushes the tightening piston (331) to slide in the housing (330), thereby tightening the tool assembly (7).

2. The tool fixing device of the tool runout measuring instrument according to claim 1, characterized in that: The at least two tightening assemblies (33) are evenly distributed along the circumferential direction of the axis (L) where the tool assembly (7) is located.

3. The tool fixing device of the tool runout measuring instrument according to claim 2, characterized in that: The housing (330) is provided with an accommodating chamber (341), and the tightening piston (331) is movably accommodated in the accommodating chamber (341). A second elastic member (333) is provided on the outer periphery of the tightening piston (331), and one end of the second elastic member (333) abuts against the second boss (337) of the tightening piston (331), and the other end abuts against the third boss (338) of the housing (330).

4. The tool fixing device of the tool runout measuring instrument according to claim 3, characterized in that: The housing (330) is provided with an air port (336), and a high-pressure air chamber (342) for accommodating the high-pressure gas is provided inside the housing (330). The air port (336) is communicated with the high-pressure air chamber (342), and the air slide valve (34) is fixedly connected to the air port (336) via an air pipe. The high-pressure gas enters the high-pressure air chamber (342) via the air port (336), thereby pushing the tightening piston (331) to move.

5. The tool fixing device of the tool runout measuring instrument according to claim 4, characterized in that: The tool assembly (7) includes a pull nail (74), the housing (330) is provided with a fourth through hole (334), the head (335) of the tightening piston (331) passes through the fourth through hole (334) and points to the pull nail (74), and when the high-pressure gas enters the high-pressure gas chamber (342), the head (335) abuts against the pull nail (74).

6. The tool fixing device of the tool runout measuring instrument according to claim 5, characterized in that: The head (335) has a conical tip and is made of steel.

7. The tool fixing device of the tool runout measuring instrument according to claim 5, characterized in that: The tightening piston (331) further includes a tail portion (343), and the second boss (337) and the tail portion (343) are both movable and abut against the inner wall of the accommodating cavity (341), and an annular groove (344) is formed between the second boss (337) and the tail portion (343), and a sealing member (345) is provided in the annular groove (344).

8. The tool fixing device of the tool runout measuring instrument according to claim 2, characterized in that: The tool fixing device further comprises a fixing seat (31) and a retaining frame (32); the fixing seat (31) is provided with a third groove (310) for accommodating the tool assembly (7); the retaining frame (32) is arranged between the fixing seat (31) and the tool assembly (7); the retaining frame (32) is accommodated in the third groove (310) and the outer wall of the retaining frame (32) abuts against the inner wall of the third groove; the tool assembly (7) is mounted on the retaining frame (32) and abuts against the inner wall of the retaining frame (32).

9. The tool fixing device of the tool runout measuring instrument according to claim 8, characterized in that: The fixing seat (31) and the retaining frame (32) are both made of steel.

10. The tool fixing device of the tool runout measuring instrument according to claim 2, characterized in that: A dust cover (35) is also installed on the base (30).

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