Center hole grinding machine

Abstract

The utility model relates to the field of grinding machines, in particular to a center hole grinding machine which comprises a grinding machine rack, a first guide rail is vertically arranged on the surface of the front side of the grinding machine rack, a tailstock device is in sliding fit with the bottom of the first guide rail, a three-tip clamping unit is combined with a fine adjustment structure of an ejector rod locking rod sleeve and a screw rod, and rapid clamping and high-precision adjustment are supported. The center rod is fixed through a ball locking mechanism, it is ensured that clamping force is stable in the machining process, workpiece deviation is avoided, clamping flexibility and stability are effectively improved, sliding friction is converted into rolling friction through a roller row arranged between the cross beam and the second sliding block, guide rail resistance is greatly reduced, the movement precision and the bearing capacity of a grinding head part are improved, and the service life of a guide rail is prolonged. The eccentric wheel adjusting mechanism is in linkage with the chain adjusting mechanism, accurate deflection of 1-3 degrees of the position of the grinding head is achieved through motor driving, the tension of a transmission chain is balanced in cooperation with a balancing weight, it is ensured that the fine adjustment process is stable and efficient, and the high-precision machining requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of grinding machine technology, and in particular to a center hole grinding machine. Background Technology

[0002] Currently, there are two main methods for machining center holes. One method is to scrape and grind the center hole using multi-edged centers and centers. This method results in poor machining accuracy, low success rate, and is time-consuming, labor-intensive, and inefficient. The other method is to machine the center hole using a center hole grinder.

[0003] Existing center hole grinding machines mostly use fixed center structure clamping devices, which have limited adjustment range and are difficult to adapt to the processing requirements of workpieces of different sizes. In addition, manual operation is cumbersome and it is difficult to achieve precise fine adjustment. Furthermore, the traditional guideways of center hole grinding machines mostly adopt sliding friction design, which is prone to generating large resistance under high load or high speed conditions, resulting in decreased motion accuracy, accelerated wear, and affecting the life of the equipment. Moreover, the grinding head components also rely heavily on mechanical transmission during processing, which has insufficient adjustment accuracy and is difficult to meet the fine adjustment requirements of high-precision processing. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a center hole grinding machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A center hole grinding machine includes a grinding machine frame. A first guide rail is vertically arranged on the front surface of the grinding machine frame. A tailstock device is slidably fitted at the bottom of the first guide rail. A three-center clamping unit is slidably fitted on the first guide rail and above the tailstock device. A crossbeam is horizontally arranged on the front surface of the grinding machine frame above the first guide rail. A second slider is slidably fitted on the crossbeam. A rotary table guide rail is mounted on the second slider. A rotary table sliding seat is slidably fitted on the rotary table guide rail. A grinding head assembly is mounted on the rotary table sliding seat.

[0007] The second slider is provided with a dressing mechanism at the bottom. A lead screw mechanism is rotatably provided inside the grinding machine frame and on the back of the crossbeam. A spline shaft mechanism is rotatably provided below the lead screw mechanism. A motor is provided on the plate inside the grinding machine frame and on one side of the spline shaft mechanism. An eccentric wheel adjustment mechanism is installed at the output end of the motor.

[0008] The three-center clamping unit includes a first slider, an upper center frame, a movable retaining ring, a top rod locking sleeve, and a top rod limiting mechanism. The first slider is vertically slidably fitted on the first guide rail. The upper center frame is vertically mounted on the movable retaining ring and is used to cooperate with the tailstock device. The top rod locking sleeves are evenly arranged and horizontally distributed on the movable retaining ring. A top rod limiting mechanism is installed at the bottom of the movable retaining ring and below the top rod locking sleeve.

[0009] The eccentric wheel adjustment mechanism includes an eccentric wheel assembly and a connecting rod. The eccentric wheel assembly is mounted on the motor output end. One end of the connecting rod is slidably fitted onto the eccentric wheel assembly, and the other end is rotatably connected to the spline shaft mechanism.

[0010] Furthermore, in a preferred configuration, the movable retaining ring is installed on the front surface of the first slider, and multiple limiting grooves are evenly arranged in the transverse direction at the bottom of the outer wall of the top rod locking sleeve. The limiting grooves are used to be locked by the top rod limiting mechanism. A center rod is slidably fitted inside the top rod locking sleeve. One end of the center rod is provided with a center head for clamping the workpiece, and the other end is provided with a first screw hole. A screw is screwed into the first screw hole, and the screw is rotatably set inside the top rod locking sleeve.

[0011] Furthermore, in a preferred configuration, one end of the screw has a threaded portion on its outer surface for screwing into the first screw hole, and the other end has a second screw hole. A screw is screwed into the second screw hole, and the screw is located at the end of the top rod locking sleeve away from the center point. The other end of the screw located in the second screw hole away from the screw inlet has a ball bearing movable hole, where a ball bearing is slidably fitted. The pointed end of the screw is used to hold the ball bearing in place.

[0012] Furthermore, in a preferred configuration, the push rod limiting mechanism includes a limiting mechanism mounting block, which is mounted on the bottom of the movable retaining ring. The limiting mechanism mounting block has a through hole for sliding of the push rod. A limiting block is provided at the top of the push rod, which passes through the movable retaining ring and locks into the limiting groove. A spring is provided on the push rod body, with the top of the spring abutting against the limiting block and the bottom of the spring abutting against the bottom end of the push rod.

[0013] In addition, a preferred structure is that the front surface of the crossbeam is symmetrically provided with second guide rails, and the second slider is laterally slidably engaged with the second guide rails. The second slider includes a sliding seat, and a rotary table guide rail mounting part is provided on the front surface of the sliding seat.

[0014] Furthermore, in a preferred configuration, the rotary table guide rail mounting part is used to mount the rotary table guide rail, and a third guide rail is symmetrically arranged vertically on the other side surface of the sliding seat away from the rotary table guide rail mounting part. The third guide rail is used to cooperate with the second guide rail, and roller rows are provided between the third guide rail and the second guide rail.

[0015] Furthermore, in a preferred configuration, the bottom of the rotary table sliding seat is provided with a mounting groove, and a chain adjustment mechanism is connected to the mounting groove. A movable hole is opened in the middle of the rotary table guide rail, which is used for the movement of the chain adjustment mechanism. A first sprocket is rotatably mounted in the movable hole, and the first sprocket cooperates with the chain adjustment mechanism for transmission. A second sprocket is rotatably mounted on the shaft of the spline shaft mechanism on the same plane as the first sprocket, and the second sprocket is used to cooperate with the chain adjustment mechanism for transmission. A connecting plate is provided on the shaft of the spline shaft mechanism on one side of the second sprocket, and the connecting plate is used to connect with the connecting rod.

[0016] Furthermore, in a preferred configuration, the chain adjustment mechanism includes a second chain, one end of which is provided with a sliding seat connector for mounting in the mounting groove, and the other end of which is connected to a bushing. A bearing rotating head is rotatably mounted inside the bushing, and the end of the bearing rotating head away from the second chain is connected to a first chain.

[0017] The second chain meshes with the teeth of the first sprocket, and the first chain meshes with the teeth of the second sprocket. A counterweight is connected to the other end of the first chain away from the bearing rotating head, and the counterweight is suspended below the second sprocket.

[0018] Furthermore, in a preferred configuration, the eccentric wheel assembly includes a connecting shaft, one end of which is mounted on the motor output end, and the other end of which is fitted with a slider. An eccentric wheel is slidably fitted onto the slider, and a sliding cavity is provided on the eccentric wheel for sliding engagement with the slider. A bearing is fitted on the outer wall of the eccentric wheel, and a mounting ring is fitted on the outside of the bearing. A sliding hole is provided on the outer wall of the mounting ring, and a connecting rod is slidably fitted into the sliding hole.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. The three-center clamping unit, combined with the fine-tuning structure of the top rod locking sleeve and screw, supports quick clamping and high-precision adjustment. The top rod is fixed by the ball locking mechanism to ensure stable clamping force during processing, avoid workpiece displacement, and effectively improve the flexibility and stability of clamping.

[0021] 2. The roller array set between the crossbeam and the second slider converts sliding friction into rolling friction, which greatly reduces the guide rail resistance, improves the motion accuracy and load-bearing capacity of the grinding head components, and extends the guide rail life;

[0022] 3. The eccentric wheel adjustment mechanism is linked with the chain adjustment mechanism. The motor drives the precise 1-3° deflection of the grinding head position. The counterweight balances the tension of the transmission chain, ensuring a smooth and efficient fine-tuning process to meet the needs of high-precision machining. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a center hole grinding machine;

[0024] Figure 2 This is a structural schematic diagram of the grinding machine frame from the front view.

[0025] Figure 3 This is a structural schematic diagram of the grinding machine frame from the rear view.

[0026] Figure 4 A schematic diagram of the structure in the closed state of the active retaining ring;

[0027] Figure 5 This is a schematic diagram of the structure after the movable retaining ring and the upper center frame are disassembled.

[0028] Figure 6 A schematic diagram of the structure in the open position of the active retaining ring;

[0029] Figure 7 This is a schematic diagram of the top rod limiting mechanism;

[0030] Figure 8 This is a schematic diagram of the internal structure of the top rod locking sleeve;

[0031] Figure 9 This is a schematic diagram of the screw structure;

[0032] Figure 10 This is a schematic diagram of the rotary table guide rail and the second slider in their installed state.

[0033] Figure 11 This is a schematic diagram of the structure after the rotary table guide rail and the second slider are separated.

[0034] Figure 12 A schematic diagram of the structure in which the second slider is mounted on the crossbeam;

[0035] Figure 13 This is a schematic diagram of the structure after the roller bank and crossbeam are separated.

[0036] Figure 14 This is a schematic diagram of the structure when the lead screw and splined shaft are in contact.

[0037] Figure 15 This is a schematic diagram of the internal structure of the grinding machine frame;

[0038] Figure 16 This is a schematic diagram of the chain adjustment mechanism connected to the rotary table guide rail.

[0039] Figure 17 This is a schematic diagram of the rotary table guide rail and rotary table sliding seat after disassembly.

[0040] Figure 18 This is a schematic diagram of the internal structure of the rotary table guide rail;

[0041] Figure 19This is a schematic diagram of the chain adjustment mechanism after it has been separated from the rotary table guide rail;

[0042] Figure 20 This is a partially enlarged structural diagram of the chain adjustment mechanism;

[0043] Figure 21 This is a schematic diagram of the disassembled motor and eccentric wheel assembly.

[0044] Figure 22 This is a schematic diagram of the disassembled eccentric wheel assembly.

[0045] In the diagram: 01 Grinding machine frame, 02 First guide rail, 03 Tailstock assembly, 04 Three-center clamping unit, 05 Grinding head assembly, 06 Eccentric wheel adjustment mechanism, 07 First slider, 08 Upper center rest, 09 Dressing mechanism, 010 Crossbeam, 0101 Second guide rail, 011 Second slider, 0111 Sliding seat, 0112 Third guide rail mounting part, 0113 Third guide rail, 012 Rotary table guide rail, 0121 Movable hole, 0122 First sprocket, 013 Rotary table sliding seat, 0131 Mounting slot, 014 Lead screw mechanism, 015 Splined shaft mechanism, 0151 Connecting plate, 0152 Second sprocket, 1. Movable retaining ring, 2. Push rod locking rod sleeve. 21 Limiting groove, 22 Top rod, 221 Top head, 222 First screw hole, 23 Screw, 231 Threaded part, 232 Second screw hole, 233 Ball movable hole, 24 Screw, 25 Ball, 3 Top rod limiting mechanism, 31 Limiting mechanism mounting block, 32 Push rod, 33 Spring, 34 Limiting block, 4 Roller row, 5 Motor, 6 Chain adjusting mechanism, 61 First chain, 611 Bearing rotating head, 62 Counterweight, 63 Second chain, 631 Bearing sleeve, 632 Sliding seat connector, 7 Eccentric wheel assembly, 71 Connecting shaft, 72 Slider, 73 Eccentric wheel, 731 Sliding cavity, 74 Bearing, 75 Mounting ring, 751 Sliding hole, 8 Connecting rod. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0047] Reference Figure 1-22A center hole grinding machine includes a grinding machine frame 01. A first guide rail 02 is vertically arranged on the front surface of the grinding machine frame 01. A tailstock device 03 is slidably fitted at the bottom of the first guide rail 02. A three-center clamping unit 04 is slidably fitted on the first guide rail 02 and above the tailstock device 03. A crossbeam 010 is horizontally arranged on the front surface of the grinding machine frame 01 above the first guide rail 02. A second slider 011 is slidably fitted on the crossbeam 010. A rotary table guide rail 012 is mounted on the second slider 011. A rotary table sliding seat 013 is slidably fitted on the rotary table guide rail 012. A grinding head component 05 is mounted on the rotary table sliding seat 013. The grinding head component 05 is used for grinding the workpiece.

[0048] The second slider 011 has a dressing mechanism 09 at its bottom. Inside the grinding machine frame 01 and on the back of the crossbeam 010, a lead screw mechanism 014 is rotatably mounted. Below the lead screw mechanism 014, a spline shaft mechanism 015 is rotatably mounted. Inside the grinding machine frame 01 and on a plate on one side of the spline shaft mechanism 015, a motor 5 is mounted. An eccentric wheel adjustment mechanism 06 is mounted at the output end of the motor 5. The eccentric wheel adjustment mechanism 06 is used for fine adjustment.

[0049] Furthermore, the three-center clamping unit 04 includes a first slider 07, an upper center frame 08, a movable retaining ring 1, a push rod locking sleeve 2, and a push rod limiting mechanism 3. The first slider 07 is vertically slidably fitted on the first guide rail 02. The upper center frame 08 is vertically mounted on the movable retaining ring 1. The upper center frame 08 is used to cooperate with the tailstock device 03. The push rod locking sleeves 2 are evenly arranged horizontally on the movable retaining ring 1. The push rod limiting mechanism 3 is installed at the bottom of the movable retaining ring 1 and below the push rod locking sleeve 2. The push rod locking sleeve 2 is used to clamp the workpiece.

[0050] Meanwhile, the eccentric wheel adjustment mechanism 06 includes an eccentric wheel assembly 7 and a connecting rod 8. The eccentric wheel assembly 7 is mounted on the output end of the motor 5. One end of the connecting rod 8 is slidably fitted on the eccentric wheel assembly 7, and the other end is rotatably connected to the spline shaft mechanism 015.

[0051] In addition, the movable retaining ring 1 is installed on the front surface of the first slider 07. Multiple limiting grooves 21 are evenly arranged in the transverse direction at the bottom of the outer wall of the top rod locking sleeve 2. The limiting grooves 21 are used to be locked by the top rod limiting mechanism 3. The top rod locking sleeve 2 has a sliding fit inside the top rod 22. One end of the top rod 22 is provided with a top head 221 for clamping the workpiece, and the other end is provided with a first screw hole 222. A screw 23 is screwed into the first screw hole 222. The screw 23 is rotatably set inside the top rod locking sleeve 2. Rotating the screw 23 can adjust the length of the top rod 22 extending from the top rod locking sleeve 2.

[0052] Meanwhile, one end of the screw 23 has a threaded portion 231 on its outer surface for screwing into the first screw hole 222, and the other end has a second screw hole 232. A screw 24 is screwed into the second screw hole 232. The screw 24 is located at the end of the top rod locking sleeve 2 away from the top tip 221. The other end of the screw 23 located away from the entrance of the second screw hole 232 has a ball movement hole 233. A ball 25 is slidably fitted into the ball movement hole 233. The pointed end of the screw 24 is used to press against the ball 25 and lock the ball 25, thereby locking the screw 23.

[0053] Furthermore, the push rod limiting mechanism 3 includes a limiting mechanism mounting block 31, which is installed at the bottom of the movable retaining ring 1. The limiting mechanism mounting block 31 has a through hole for sliding of the push rod 32. The top of the push rod 32 is provided with a limiting block 34, which passes through the movable retaining ring 1 and locks into the limiting groove 21. A spring 33 is provided on the push rod 32. The top of the spring 33 abuts against the limiting block 34, and the bottom of the spring 33 abuts against the bottom end of the push rod 32. The spring 33 realizes the reset of the push rod 32.

[0054] Among them, the front surface of the crossbeam 010 is symmetrically provided with second guide rails 0101, and the second slider 011 is laterally slidably engaged with the second guide rail 0101. The second slider 011 includes a sliding seat 0111, and a rotary table guide rail mounting part 0112 is provided on the front surface of the sliding seat 0111.

[0055] Meanwhile, the rotary table guide rail mounting part 0112 is used to install the rotary table guide rail 012. The sliding seat 0111 is symmetrically provided with a third guide rail 0113 on the other side surface away from the rotary table guide rail mounting part 0112. The third guide rail 0113 is used to cooperate with the second guide rail 0101, and a roller row 4 is provided between the third guide rail 0113 and the second guide rail 0101. The roller row 4 can effectively reduce the frictional resistance between the third guide rail 0113 and the second guide rail 0101.

[0056] In addition, the bottom of the rotary table sliding seat 013 is provided with a mounting groove 0131, and a chain adjustment mechanism 6 is connected to the mounting groove 0131. A movable hole 0121 is opened in the middle of the rotary table guide rail 012. The movable hole 0121 is used for the movement of the chain adjustment mechanism 6, and a first sprocket 0122 is rotatably arranged in the movable hole 0121. The first sprocket 0122 cooperates with the chain adjustment mechanism 6 for transmission. A second sprocket 0152 is rotatably arranged on the shaft of the spline shaft mechanism 015 on the same plane as the first sprocket 0122. The second sprocket 0152 is used to cooperate with the chain adjustment mechanism 6 for transmission. A connecting plate 0151 is provided on the shaft of the spline shaft mechanism 015 on one side of the second sprocket 0152. The connecting plate 0151 is used to connect with the connecting rod 8. The chain adjustment mechanism 6 is used to adjust the rotary table sliding seat 013.

[0057] Furthermore, the chain adjustment mechanism 6 includes a second chain 63. One end of the second chain 63 is provided with a sliding seat connector 632 for installation in the mounting groove 0131. The other end of the second chain 63 is connected to a bushing 631. A bearing rotating head 611 is rotatably installed inside the bushing 631. The end of the bearing rotating head 611 away from the second chain 63 is connected to the first chain 61. The second chain 63 meshes with the teeth of the first sprocket 0122, and the first chain 61 meshes with the teeth of the second sprocket 0152. The other end of the first chain 61 away from the bearing rotating head 611 is connected to a counterweight 62. The counterweight 62 is suspended below the second sprocket 0152. The bearing rotating head 611, in conjunction with the bushing 631, can achieve different angles of deflection of the first chain 61 and the second chain 63 during chain drive.

[0058] Furthermore, the eccentric wheel assembly 7 includes a connecting shaft 71. One end of the connecting shaft 71 is mounted on the output end of the motor 5, and the other end of the connecting shaft 71 is fitted with a slider 72. An eccentric wheel 73 is slidably fitted on the slider 72. The eccentric wheel 73 has a sliding cavity 731 for sliding engagement with the slider 72. A bearing 74 is fitted on the outer wall of the eccentric wheel 73, and a mounting ring 75 is fitted on the outside of the bearing 74. A sliding hole 751 is opened on the outer wall of the mounting ring 75. The connecting rod 8 is slidably fitted at the sliding hole 751. The slider 72 rotates, driving the eccentric wheel 73 to slide in accordance with its eccentricity, thereby realizing the synchronous sliding of the outer safety ring 75, pushing out the connecting rod 8, and realizing the rotation of the connecting disc 0151 by 1-3 degrees. The key shaft mechanism 015 rotates synchronously by 1-3 degrees.

[0059] In this embodiment, when grinding with a center hole grinder, the workpiece body is clamped by a three-center clamping device 04. The bottom of the workpiece is held in place by the lower center of the tail end device 03. After the workpiece is placed at the center of the movable retaining ring 1, the height of the movable retaining ring 1 is adjusted by adjusting the first slider 07 so that it can be clamped in a suitable position. The workpiece is held in place by adjusting the top rod locking sleeve 2. When adjusting the top rod locking sleeve 2, the screw 24 is first turned out a certain distance from the second screw hole 232 so that the tip of the screw 24 no longer presses against the ball 25. The ball 25 can move in the ball movable hole 233, and the operator can then rotate the screw 23.

[0060] As the screw 23 rotates, the threaded part 231 rotates within the first threaded hole 222. The tip rod 22 rotates with the threaded part 231, extending or retracting at the end of the tip rod locking sleeve 2. This allows the tip rod 221 to be adjusted to press against the outer wall of the workpiece. After adjusting the tip rod 22, the screw 24 can be turned so that the tip of the screw 24 presses against the ball 25 again. The ball 25 then pushes out of the ball movement hole 233 and contacts the inner wall of the tip rod locking sleeve 2, thus preventing the screw 232 from rotating and locking it in place.

[0061] The rotating screw 23 is used for fine adjustment of the extension length of the tip 221. When a large adjustment is required, the top rod limiting mechanism 3 is used to adjust the distance of the extension of the entire top rod locking sleeve 2. By pulling down the push rod 32, the spring 33 contracts, thereby causing the limiting block 34 to separate from the limiting groove 21. At this time, the top rod locking sleeve 2 on the movable retaining ring 1 can be slid. After adjustment, the push rod 32 is released, the spring 33 releases its elastic potential energy, and the spring 33 resets, driving the push 32 to reset, so that the limiting block 34 can be re-engaged into the limiting groove 21.

[0062] When the grinding head component 05 of the grinding machine frame 01 is working, the second slider 011 moves on the crossbeam 010 to adjust the position of the grinding head component 05 laterally. When adjusting the grinding head component 05 laterally, the third guide rail 0113 moves laterally on the second guide rail 0101. Roller row 4 is set between the third guide rail 0113 and the second guide rail 0101 to achieve mutual sliding between the third guide rail 0113 and the second guide rail 0101. The design of the roller row 4 makes the guide rail have higher load capacity and rigidity. The linear contact and cross arrangement between the roller row 4 and the second guide rail 0101 and the third guide rail 0113 enable the guide rail to withstand greater loads.

[0063] Meanwhile, the design of roller row 4 reduces the coefficient of friction between the second guide rail 0101 and the third guide rail 0113, thereby reducing frictional resistance during movement and improving motion accuracy and speed. This design enables the guide rail to maintain high-precision linear motion even under high-speed movement and frequent starts.

[0064] When the grinding head component 05 is working, it is often necessary to make fine adjustments to the rotary table sliding seat 013 so that the rotary table sliding seat 013 can move a small distance on the rotary table guide rail 012. This can be achieved by the eccentric wheel adjustment mechanism 06 in conjunction with the spline shaft mechanism 015 and the chain adjustment mechanism 6.

[0065] During adjustment, motor 5 drives connecting shaft 71 to rotate at a certain angle, thereby rotating slider 72. When slider 72 rotates, eccentric wheel 73, with its eccentric structure, moves laterally in conjunction with sliding cavity 731 while slider 72 rotates. This causes mounting ring 75 to move connecting rod 8. Connecting rod 8 pushes out, causing connecting disc 0151, which is rotatably connected to it, to rotate 1-3 degrees. After connecting disc 0151 rotates 1-3 degrees, second sprocket 0152 deflects 1-3 degrees. After second sprocket 0152 rotates, first chain 61 moves downward in conjunction with counterweight 62, causing second chain 63 to pull rotary table sliding seat 013 a small distance on rotary table guide rail 012, thereby achieving fine adjustment of grinding head assembly 05.

[0066] In this invention, the three-center clamping unit 04, combined with the fine-tuning structure of the top rod locking sleeve 2 and the screw 23, supports rapid clamping and high-precision adjustment. The top rod 22 is fixed by the ball 25 locking mechanism to ensure stable clamping force during processing, avoid workpiece displacement, and effectively improve the flexibility and stability of clamping. The roller row 4 set between the crossbeam 010 and the second slider 011 converts sliding friction into rolling friction, significantly reducing guide rail resistance, improving the motion accuracy and load-bearing capacity of the grinding head component 05, and extending the life of the guide rail. The eccentric wheel adjustment mechanism 06 is linked with the chain adjustment mechanism 6, and the grinding head position is precisely deflected by 1-3° by the motor 5. The counterweight 62 balances the transmission chain tension to ensure a smooth and efficient fine-tuning process, meeting the needs of high-precision processing.

[0067] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A center hole grinding machine, comprising a grinding machine frame (01), characterized in that, A first guide rail (02) is vertically arranged on the front surface of the grinding machine frame (01). A tailstock device (03) is slidably fitted at the bottom of the first guide rail (02). A three-center clamping unit (04) is slidably fitted on the first guide rail (02) and above the tailstock device (03). A crossbeam (010) is horizontally arranged on the front surface of the grinding machine frame (01) above the first guide rail (02). A second slider (011) is slidably fitted on the crossbeam (010). A rotary table guide rail (012) is installed on the second slider (011). A rotary table sliding seat (013) is slidably fitted on the rotary table guide rail (012). A grinding head component (05) is installed on the rotary table sliding seat (013). The second slider (011) is provided with a dressing mechanism (09) at the bottom. Inside the frame of the grinding machine (01) and on the back of the crossbeam (010), a lead screw mechanism (014) is rotatably provided. Below the lead screw mechanism (014), a spline shaft mechanism (015) is rotatably provided. Inside the frame of the grinding machine (01) and on the plate on one side of the spline shaft mechanism (015), a motor (5) is provided. An eccentric wheel adjustment mechanism (06) is assembled at the output end of the motor (5). The three-center clamping unit (04) includes a first slider (07), an upper center frame (08), a movable retaining ring (1), a top rod locking sleeve (2), and a top rod limiting mechanism (3). The first slider (07) is vertically slidably fitted on the first guide rail (02). The upper center frame (08) is vertically installed on the movable retaining ring (1). The upper center frame (08) is used to cooperate with the tailstock device (03). The top rod locking sleeves (2) are evenly arranged horizontally on the movable retaining ring (1). The top rod limiting mechanism (3) is installed at the bottom of the movable retaining ring (1) and below the top rod locking sleeves (2). The eccentric wheel adjustment mechanism (06) includes an eccentric wheel assembly (7) and a connecting rod (8). The eccentric wheel assembly (7) is mounted on the output end of the motor (5). One end of the connecting rod (8) is slidably fitted on the eccentric wheel assembly (7), and the other end is rotatably connected to the spline shaft mechanism (015).

2. The center hole grinding machine according to claim 1, characterized in that, The movable retaining ring (1) is installed on the front surface of the first slider (07). Multiple limiting grooves (21) are evenly arranged in the transverse direction at the bottom of the outer wall of the top rod locking sleeve (2). The limiting grooves (21) are used to be locked by the top rod limiting mechanism (3). The top rod locking sleeve (2) is slidably fitted with a top rod (22). One end of the top rod (22) is provided with a top head (221) for clamping the workpiece, and the other end is provided with a first screw hole (222). A screw (23) is screwed into the first screw hole (222). The screw (23) is rotatably set inside the top rod locking sleeve (2).

3. The center hole grinding machine according to claim 2, characterized in that, The screw (23) has a threaded part (231) on the outside of one end of the rod body for screwing into the first screw hole (222), and a second screw hole (232) is opened at the other end. A screw (24) is screwed into the second screw hole (232). The screw (24) is located at the other end of the top rod locking sleeve (2) away from the top tip (221). The other end of the screw (23) located in the second screw hole (232) away from the entrance of the screw (24) is connected to a ball movement hole (233). A ball (25) is slidably engaged in the ball movement hole (233). The pointed end of the screw (24) is used to hold the ball (25).

4. The center hole grinding machine according to claim 2, characterized in that, The top rod limiting mechanism (3) includes a limiting mechanism mounting block (31), which is installed at the bottom of the movable retaining ring (1). The limiting mechanism mounting block (31) has a through hole for sliding of the push rod (32). The top of the push rod (32) is provided with a limiting block (34), which passes through the movable retaining ring (1) and locks the limiting groove (21). A spring (33) is provided on the push rod (32), with the top of the spring (33) abutting against the limiting block (34) and the bottom of the spring (33) abutting against the bottom end of the push rod (32).

5. The center hole grinding machine according to claim 1, characterized in that, The front surface of the crossbeam (010) is symmetrically provided with second guide rails (0101) on the top and bottom. The second slider (011) is laterally slidably engaged with the second guide rail (0101). The second slider (011) includes a sliding seat (0111). A rotary table guide rail mounting part (0112) is provided on the front surface of the sliding seat (0111).

6. The center hole grinding machine according to claim 5, characterized in that, The rotary table guide rail mounting part (0112) is used to install the rotary table guide rail (012). The sliding seat (0111) is symmetrically provided with a third guide rail (0113) on the other side surface away from the rotary table guide rail mounting part (0112). The third guide rail (0113) is used to cooperate with the second guide rail (0101), and roller rows (4) are provided between the third guide rail (0113) and the second guide rail (0101).

7. The center hole grinding machine according to claim 1, characterized in that, The bottom of the rotary table sliding seat (013) is provided with a mounting groove (0131), and a chain adjustment mechanism (6) is connected to the mounting groove (0131). A movable hole (0121) is opened in the middle of the rotary table guide rail (012). The movable hole (0121) is used for the movement of the chain adjustment mechanism (6), and a first sprocket (0122) is rotatably arranged in the movable hole (0121). The first sprocket (0122) is used to drive the chain adjustment mechanism (6). A second sprocket (0152) is rotatably arranged on the shaft of the spline shaft mechanism (015) on the same plane as the first sprocket (0122). The second sprocket (0152) is used to drive the chain adjustment mechanism (6). A connecting plate (0151) is provided on the shaft of the spline shaft mechanism (015) on one side of the second sprocket (0152). The connecting plate (0151) is used to connect with the connecting rod (8).

8. The center hole grinding machine according to claim 7, characterized in that, The chain adjustment mechanism (6) includes a second chain (63), one end of which is provided with a sliding seat connector (632) for installation in the mounting groove (0131), and the other end of the second chain (63) is connected to a bushing (631). A bearing rotating head (611) is rotatably provided inside the bushing (631), and the end of the bearing rotating head (611) away from the second chain (63) is connected to a first chain (61). The second chain (63) meshes with the teeth of the first sprocket (0122), the first chain (61) meshes with the teeth of the second sprocket (0152), and the other end of the first chain (61) away from the bearing rotating head (611) is connected to a counterweight (62), which is suspended below the second sprocket (0152).

9. The center hole grinding machine according to claim 1, characterized in that, The eccentric wheel assembly (7) includes a connecting shaft (71), one end of which is mounted on the output end of the motor (5), and a slider (72) is sleeved on the other end of the connecting shaft (71). An eccentric wheel (73) is slidably fitted on the slider (72). A sliding cavity (731) for sliding fit of the slider (72) is provided on the eccentric wheel (73). A bearing (74) is sleeved on the outer wall of the eccentric wheel (73). An mounting ring (75) is sleeved on the outside of the bearing (74). A sliding hole (751) is provided on the outer wall of the mounting ring (75). The connecting rod (8) is slidably fitted at the sliding hole (751).

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