Grinding head assembly and polishing machine

Abstract

The utility model discloses a grinding head assembly and a polishing machine. The grinding head assembly comprises a grinding head, a driving mechanism, a machine base and a lifting mechanism. The driving mechanism comprises a permanent magnet motor, a main shaft and a shaft sleeve, a machine body of the permanent magnet motor is fixed on the machine base, an annular rotor and a stator surrounding the periphery of the rotor are arranged in the machine body, the shaft sleeve is pivoted to the machine base, is connected in a hole in the middle of the rotor in a penetrating mode and is synchronously connected with the rotor, and the main shaft is connected in the shaft sleeve in a penetrating mode; the spindle is in key connection with the shaft sleeve so as to synchronously rotate with the shaft sleeve and move relative to the shaft sleeve in the axial direction of the shaft sleeve; the lifting mechanism comprises an air cylinder and a supporting plate, the supporting plate is pivoted to the top of the spindle and supported below the top of the spindle, a cylinder body of the air cylinder is fixedly matched with the machine base, and the telescopic rod is connected to the supporting plate. The grinding head is connected to the lower end of the spindle. The occupied space of the driving mechanism in the grinding head assembly is reduced, a transmission mechanism does not need to be arranged between the permanent magnet motor and the main shaft, and the transmission efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of stone processing technology, specifically to a grinding head assembly and a polishing machine. Background Technology

[0002] Polishing machines are important equipment for stone processing. They typically include a grinding head assembly, which uses multiple grinding heads to continuously polish the stone surface, achieving a certain degree of smoothness.

[0003] A grinding head assembly typically includes a drive mechanism and a grinding head. The drive mechanism generally includes a spindle, a motor, and a lifting cylinder. The grinding head is connected to the bottom of the spindle. The motor drives the spindle to rotate, which in turn drives the grinding head. The lifting cylinder moves the spindle up and down, allowing the material to be ground to be placed below the grinding head, and simultaneously allowing the grinding head to move downwards and contact the surface of the material. Because a high-power motor is required to drive the grinding head, the motor is quite large. The motor cannot be coaxial with the spindle; the motor shaft is usually connected to the spindle via a belt drive. In this transmission method, belt drives experience significant wear, reducing transmission efficiency and increasing energy consumption. More importantly, the motor not being coaxial with the spindle results in a large space occupied by the entire grinding head assembly, hindering the arrangement of other components on the polishing machine. The large size also limits the lateral movement of the grinding head assembly on the polishing machine, making it difficult to polish large-sized materials. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to propose a grinding head assembly with high transmission efficiency and small space occupation.

[0005] The second objective of this utility model is to provide a polishing machine.

[0006] To achieve the first objective mentioned above, this utility model adopts the following technical solution:

[0007] The grinding head assembly includes a grinding head, a drive mechanism, a base, and a lifting mechanism;

[0008] The drive mechanism includes a permanent magnet motor, a main shaft, and a bushing. The body of the permanent magnet motor is fixed on the base. Inside the body, there is a ring-shaped rotor and a stator surrounding the rotor. The bushing is pivotally connected to the base and passes through a hole in the middle of the rotor and is synchronously connected to the rotor. The main shaft passes through the inside of the bushing and is keyed to the bushing so that the main shaft and the bushing rotate synchronously and move relative to the bushing along the axial direction of the bushing.

[0009] The lifting mechanism includes a cylinder and a support plate. The support plate is pivotally connected to the top of the main shaft and supported below the top of the main shaft. The cylinder body is fixedly fitted to the machine base, and the telescopic rod is connected to the support plate.

[0010] The grinding head is connected to the lower end of the spindle.

[0011] The lifting mechanism includes two cylinders respectively located on both sides of the main shaft. The two sides of the support plate protrude from both sides of the main shaft. The cylinder bodies of the two cylinders are fixedly connected to the body of the permanent magnet motor, and the telescopic rods are fixed to both sides of the support plate.

[0012] A connecting sleeve is fitted on the upper outer side of the main shaft. Two first bearings are provided between the connecting sleeve and the main shaft, which are offset along the axial direction of the main shaft. The inner ring of the first bearing is connected to the main shaft, and the outer ring is connected to the connecting sleeve. A support spacer is fitted on the main shaft between the two first bearings. The two ends of the support spacer abut against the inner rings of the two first bearings respectively. A shoulder is provided on the main shaft, which is supported on the lower end face of the inner ring of the lower first bearing. A locking nut is screwed onto the top of the main shaft and pressed against the upper end face of the inner ring of the upper first bearing. A support plate is fixedly connected to the top of the connecting sleeve.

[0013] The support plate is provided with an end cap that covers the top of the connecting sleeve, and the end cap is fixed to the support plate by bolts.

[0014] The top of the bushing is provided with a dust cover that extends upward and protrudes from the upper part of the permanent magnet motor. At least a portion of the top of the dust cover passes through the connecting sleeve and is fitted with the connecting sleeve with a clearance.

[0015] The base includes a plate-shaped portion and a cylindrical portion extending downward from the plate-shaped portion to be fitted onto the outside of the bushing. The bushing is pivotally engaged with the cylindrical portion via a second bearing. The body of the permanent magnet motor is fixedly connected to the upper surface of the plate-shaped portion.

[0016] The bushing has a detachable bushing fixed inside, which is mounted on the main shaft. The inner surface of the bushing has a keyway extending along its axial direction. The main shaft has a detachable key protruding from its surface, which is slidably embedded in the keyway.

[0017] The spindle is equipped with a cooling channel that extends from one end to the other.

[0018] To achieve the second objective mentioned above, this utility model adopts the following technical solution:

[0019] Polishing machine, including the aforementioned grinding head assembly.

[0020] The beneficial effects of this utility model are as follows:

[0021] In this invention, a permanent magnet motor drives the bushing to rotate. The bushing is keyed to the spindle, allowing the spindle to rotate with the bushing. Simultaneously, the spindle can move up and down relative to the bushing along its own axis, thus meeting the grinding requirements of the grinding head. The permanent magnet motor and the spindle are coaxially arranged, which greatly reduces the space occupied by the drive mechanism in the grinding head assembly. Furthermore, the bushing is directly connected to the rotor of the permanent magnet motor, eliminating the need for a transmission mechanism between the permanent magnet motor and the spindle, thereby improving transmission efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 for Figure 2 Schematic diagram of the middle bushing;

[0025] Figure 4 for Figure 2 A schematic diagram of the central spindle. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0027] like Figure 1 , 2As shown, this utility model discloses a grinding head assembly, which includes a grinding head 10, a drive mechanism, a base 20, and a lifting mechanism. The drive mechanism includes a permanent magnet motor 40, a main shaft 30, and a bushing 31. The body 41 of the permanent magnet motor 40 is fixedly connected to the base 20 by bolts. Inside the body 41 of the permanent magnet motor 40, a rotor 42 and a stator 43 are arranged. The rotor 42 is annular with a through hole in its center. The stator 43 surrounds the outer periphery of the rotor 42. The bushing 31 is pivotally connected to the base 20, and its upper end passes through the through hole in the center of the rotor 42 and is synchronously connected to the rotor 42. That is, the permanent magnet motor 40 can drive the bushing 31 to rotate relative to the base 20. The main shaft 30 passes through the bushing 31, and its upper and lower ends protrude from the bushing 31 respectively. The grinding head 10 is connected to the lower end of the main shaft 30. The main shaft 30 and the bushing 31 are keyed together, and the main shaft 30 is connected to the bushing 31 through the key connection. The main shaft 30 can rotate with the bushing 31, and at the same time, it can move up and down relative to the bushing 31 along its own axis. The lifting mechanism is used to drive the main shaft 30 to move up and down, so as to change the distance between the grinding head 10 at the bottom of the main shaft 30 and the stone support table, thereby facilitating the placement of the stone to be ground. That is, after raising the main shaft 30 to a certain height, the distance between the grinding head 10 and the stone support table increases. After the stone is placed on the stone support table, the main shaft 30 descends, so that the grinding head 10 can contact the stone surface. The lifting mechanism includes a cylinder 50 and a support plate 53. The support plate 53 is pivotally engaged with the top of the main shaft 30, and the support plate 53 supports the top of the main shaft 30. The cylinder body of the cylinder 50 is fixedly engaged with the base 20, and the telescopic rod extends upward and connects to the support plate 53. Activating the cylinder 50 moves the support plate 53 upward, which in turn pushes the main shaft 30 upward.

[0028] In this invention, a permanent magnet motor drives the bushing to rotate. The bushing is keyed to the spindle, allowing the spindle to rotate with the bushing. Simultaneously, the spindle can move up and down relative to the bushing along its own axis, thus meeting the grinding requirements of the grinding head. The permanent magnet motor and the spindle are coaxially arranged, which greatly reduces the space occupied by the drive mechanism in the grinding head assembly. Furthermore, the bushing is directly connected to the rotor of the permanent magnet motor, eliminating the need for a transmission mechanism between the permanent magnet motor and the spindle, thereby improving transmission efficiency.

[0029] In a preferred embodiment, the lifting mechanism of this invention includes two cylinders 50, which are located on both sides of the main shaft 30. The two sides of the support plate 53 protrude from both sides of the main shaft 30. The cylinder bodies of the two cylinders 50 are fixedly connected to the body 41 of the permanent magnet motor 40, and the telescopic rods 51 are fixed to both sides of the support plate 53. A thrust bearing can be provided between the support plate and the main shaft 30, allowing the support plate 53 to pivot with the main shaft 30 while bearing a certain axial pressure. In a preferred embodiment, for greater stability and more flexible rotation of the lifting mechanism, a connecting sleeve 52 is fitted onto the upper outer side of the main shaft 30. Two first bearings 55 are provided between the connecting sleeve 52 and the main shaft 30. The bearing 55 is offset along the axial direction of the main shaft 30. The inner ring of the first bearing 55 is fixed to the main shaft 30 by a tight fit, and the outer ring is fixed to the connecting sleeve 52 by a tight fit. The main shaft 30 and the connecting sleeve 52 are pivotally connected by the two first bearings 55 so that they can rotate relative to each other. A support spacer 56 is sleeved on the outside of the main shaft 30. The top of the support spacer 56 abuts against the lower end face of the inner ring of the upper first bearing 55, and the bottom abuts against the upper end face of the inner ring of the lower first bearing 55. A shoulder is provided on the main shaft 30, which supports the lower end face of the inner ring of the lower first bearing 55. A locking nut 54 is screwed to the top of the main shaft 30. The locking nut 54 is pressed against the upper end face of the inner ring of the upper first bearing 55. The support plate 53 is fixedly connected to the top of the connecting sleeve 52.

[0030] An end cap 57 is provided on the support plate 53 to cover the top of the connecting sleeve 52. The end cap 57 is fixed to the support plate 53 by bolts. The end cap 57 covers the top of the connecting sleeve 52 to prevent dust, water and other impurities from entering the connecting sleeve 52 and affecting the first bearing 55. The end cap 57 is detachably installed on the support plate 53, which facilitates the assembly and maintenance of the locking nut 54 and other parts. In addition, a dust cover 311 extending upward is provided on the top of the bushing 31. The dust cover 311 is sleeved on the outside of the main shaft 30 and protrudes from the upper part of the permanent magnet motor 40. At least a part of the top of the dust cover 311 penetrates into the connecting sleeve 52 from the bottom. The dust cover 311 and the connecting sleeve 52 provide a closed environment for the main shaft 30. At the same time, the dust cover 311 and the connecting sleeve 52 are clearance-fitted so that they can rotate relative to each other to avoid interference.

[0031] The aforementioned base 20 includes a plate-shaped portion 21 and a cylindrical portion 22 extending downward from the plate-shaped portion 21 to be fitted onto the outside of the bushing 31. The bushing 31 is pivotally engaged with the cylindrical portion 22 via a second bearing 23. The body 41 of the permanent magnet motor 40 is fixedly connected to the upper surface of the plate-shaped portion 21.

[0032] A bushing 32 is detachably fixed inside the bushing 31. The bushing 32 is sleeved on the outside of the spindle 30. The inner surface of the bushing 32 is provided with a keyway 321 extending along its axial direction. Correspondingly, a protruding key 301 protruding from the surface of the spindle 30 is detachably fixed at a corresponding position on the spindle 30. The protruding key 301 is slidably embedded in the keyway 321, so that the spindle 30 can slide along the axial direction of the bushing 32, thereby allowing the spindle 30 to rotate with the bushing 31 and move up and down relative to the bushing 31. Because of the detachable fixing method, when the bushing 32 and the protruding key 301 wear down and reduce the machining accuracy, new bushing 32 and protruding key 301 can be replaced.

[0033] like Figure 2 , 4 As shown, the main shaft 30 has a hollow structure. Specifically, a cooling channel is provided on it, extending from its upper end to its lower end. When polishing stone, a water supply pipe can be connected to the top of the main shaft 30. The water entering the main shaft 30 can cool down the permanent magnet motor 40 and other components such as bearings.

[0034] The polishing machine of this utility model includes the above-mentioned grinding head assembly. The other structures of the polishing machine are the same as those in the prior art, and will not be described in detail here.

[0035] The above description is merely a preferred embodiment of the present utility model, and is a further detailed description of the present utility model in conjunction with specific preferred embodiments. It should not be considered that the specific implementation of the present utility model is limited to these descriptions. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A grinding head assembly, characterized in that: It includes a grinding head, a driving mechanism, a machine base, and a lifting mechanism; The driving mechanism includes a permanent magnet motor, a main shaft, and a sleeve. The body of the permanent magnet motor is fixed on the base, and a ring-shaped rotor and a stator surrounding the outer periphery of the rotor are arranged inside the body. The sleeve is pivotally connected to the base, and is inserted into a hole in the middle of the rotor and synchronously connected with the rotor. The main shaft is inserted into the sleeve, and the main shaft and the sleeve are key-connected so that the main shaft and the sleeve rotate synchronously and move relative to the sleeve along the axial direction of the sleeve. The lifting mechanism includes a cylinder and a support plate, the support plate is pivotally connected to the top of the main shaft and supported below the top of the main shaft, the cylinder body of the cylinder is fixedly matched with the machine base, and the telescopic rod is connected to the support plate; The grinding head is connected to the lower end of the main shaft.

2. The grinding head assembly according to claim 1, characterized in that: The lifting mechanism includes two cylinders respectively arranged on both sides of the main shaft, the two sides of the support plate respectively protrude from the two sides of the main shaft, the cylinder bodies of the two cylinders are fixedly connected to the body of the permanent magnet motor, and the telescopic rods are respectively fixed on both sides of the support plate.

3. The grinding head assembly according to claim 2, characterized in that: A connecting sleeve is sleeved on the upper outer side of the main shaft, and two first bearings staggered along the axial direction of the main shaft are arranged between the connecting sleeve and the main shaft. The inner ring of the first bearing is connected to the main shaft, and the outer ring is connected to the connecting sleeve. A supporting spacer sleeve located between the two first bearings is sleeved on the main shaft, and the two ends of the supporting spacer sleeve are respectively pressed against the inner rings of the two first bearings. A shoulder is provided on the main shaft for supporting the lower end surface of the inner ring of the first bearing below. A locking nut pressed on the upper end surface of the inner ring of the first bearing above is screwed on the top of the main shaft, and the support plate is fixedly connected to the top of the connecting sleeve.

4. The grinding head assembly according to claim 3, characterized in that: An end cover is arranged on the support plate and covers the top of the connecting sleeve. The end cover is fixed on the support plate by bolts.

5. The grinding head assembly according to claim 3, characterized in that: A dust cover extending upward and protruding from the upper part of the permanent magnet motor is arranged on the top of the shaft sleeve, and at least a part of the top end of the dust cover is inserted into the connecting sleeve and is in gap fit with the connecting sleeve.

6. The grinding head assembly according to claim 1, characterized in that: The base includes a plate-like portion and a cylindrical portion extending downward from the plate-like portion to be sleeved outside the shaft sleeve. The shaft sleeve is pivotally matched with the cylindrical portion through a second bearing. The body of the permanent magnet motor is fixedly connected to the upper surface of the plate-like portion.

7. The grinding head assembly according to claim 1, characterized in that: A bushing arranged on the main shaft is detachably fixed inside the shaft sleeve, and a keyway extending along its axial direction is arranged on the inner surface of the bushing. A convex key protruding from its surface is detachably fixed on the main shaft, and the convex key is slidably embedded in the keyway.

8. The grinding head assembly according to claim 1, characterized in that: The main shaft is provided with a cooling channel extending from one end to the other end thereof.

9. Polishing machine, characterized in that, The invention comprises a grinding head assembly as described in any one of claims 1 to 8.

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