High-precision hole grinding equipment

Abstract

The utility model discloses high-precision hole grinding equipment which comprises a horizontally-arranged workbench, a clamp rotationally arranged on the top face of the workbench and a machine head arranged over the clamp in a lifting mode. The machine head comprises a stand column connected to the workbench in a sliding mode, a machine head box installed on the stand column and a grinding head arranged over the clamp through the machine head box, and the grinding head comprises a cylinder sleeve fixed to the machine head box, a driving shaft sliding in the cylinder sleeve through a lifting sleeve and a grinding rod connected to the tail end of the driving shaft. A first bearing seat corresponding to the driving shaft is arranged at the top end of the cylinder sleeve, the driving shaft is rotationally arranged on the first bearing seat through a shaft sleeve, the shaft sleeve is connected to a first motor through a synchronous belt, and a second motor for driving the lifting sleeve to ascend and descend is arranged on the side face of the machine head box. The high-precision hole grinding equipment is compact in structure and suitable for high-precision machining of deep holes.

Description

Technical Field

[0001] The utility model relates to the field of automated machinery, in particular to a high-precision hole grinding device. Background Art

[0002] At present, the more advanced and efficient process methods for machining deep holes mainly adopt gun drilling or ejector drilling, which are completed on a spindle-mounted internal cooling boring machine or a special machine tool. They can complete the machining of holes with generally low precision requirements. For deep hole machining with high precision requirements, the tool cannot meet the dimensional tolerance and form and position tolerance requirements; the inner hole after machining needs to be ground. For example, the utility model patent with Chinese patent publication number CN106181612A discloses an inner hole grinding machine. The grinding method is mainly to grind the inner hole of the workpiece through the unidirectional rotation of the grinding head, and the grinding effect is average. Utility Model Content

[0003] The purpose of the utility model is to provide a high-precision hole grinding device to overcome the deficiencies in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] An embodiment of the present utility model discloses a high-precision hole grinding device, comprising a horizontally arranged workbench, a clamp rotatably arranged on the top surface of the workbench and a machine head lifted and lowered directly above the clamp, the machine head comprising a column slidably connected to the workbench, a machine head box installed on the column and a grinding head arranged directly above the clamp through the machine head box, the grinding head comprising a cylinder sleeve fixed to the machine head box, a driving shaft sliding in the cylinder sleeve through a lifting sleeve and a grinding rod connected to the end of the driving shaft, a first bearing seat corresponding to the driving shaft is provided at the top of the cylinder sleeve, the driving shaft is rotatably set on the first bearing seat through a shaft sleeve, the shaft sleeve is connected to a first motor through a synchronous belt, and a second motor for driving the lifting sleeve to rise and fall is provided on the side of the machine head box.

[0006] Furthermore, in the above-mentioned high-precision hole grinding equipment, a cabinet is provided on the bottom surface of the workbench, and a third motor connected to the clamp through a belt drive and a fourth motor connected to the column through a screw drive are provided in the cabinet.

[0007] Furthermore, in the above-mentioned high-precision hole grinding equipment, a guide sleeve corresponding to the column is provided on the top surface of the workbench, and the column is slidably arranged in the guide sleeve.

[0008] Furthermore, in the above-mentioned high-precision hole grinding equipment, a guide groove is provided on the surface of the column along its axial direction, and a guide member sliding in the guide groove is embedded in the inner wall of the guide sleeve.

[0009] Furthermore, in the above-mentioned high-precision hole grinding equipment, the outer wall of the lifting sleeve is provided with a plurality of driving teeth, the side wall of the cylinder sleeve is provided with avoidance holes corresponding to the driving teeth, and a gear shaft engaged with the driving teeth is rotatably provided in the head box, one end of the gear shaft is connected to the second motor through a reduction gear box, and a handwheel is provided at the other end.

[0010] Furthermore, in the above-mentioned high-precision hole grinding equipment, a backlash-eliminating rack is provided on the side of the gear shaft away from the lifting sleeve, and the backlash-eliminating rack is slidably connected to the head box through a spring rod.

[0011] Furthermore, in the above-mentioned high-precision hole grinding equipment, the driving shaft includes a spline shaft, a first rotating shaft, a connecting shaft, a second rotating shaft and an installation shaft arranged in sequence, the sleeve is slidably sleeved on the spline shaft, and its inner wall is provided with a plurality of key grooves corresponding to the spline shaft, a first linear bearing is provided between the first rotating shaft and the lifting sleeve, a second linear bearing is provided between the second rotating shaft and the lifting sleeve, and the grinding rod is connected to the end of the installation shaft.

[0012] Furthermore, in the above-mentioned high-precision hole grinding equipment, a toggle shaft is connected between the connecting shaft and the second rotating shaft, and eccentric wheels are respectively arranged on both sides of the toggle shaft for rotation through the rotating shaft. The rotating shaft is arranged along the radial direction of the toggle shaft, and the inner wall of the lifting sleeve is embedded with a contact ring corresponding to the eccentric wheel. A step through hole is provided in the contact ring, which are a first step hole and a second step hole respectively, wherein the first step hole is slidably sleeved on the toggle shaft, and the second step hole is slidably sleeved on the second rotating shaft.

[0013] Furthermore, in the above-mentioned high-precision hole grinding equipment, the first linear bearing is connected to the inner wall of the lifting sleeve through a bearing sleeve, and the end of the first rotating shaft close to the spline shaft is elastically abutted against the bearing sleeve through a spring sleeve, and a first plane bearing is arranged between the first rotating shaft and the spring sleeve.

[0014] Furthermore, in the above-mentioned high-precision hole grinding equipment, the outer wall of the lifting sleeve is connected to a sensing block, the side wall of the cylinder sleeve is provided with a slide groove corresponding to the sensing block, and the side wall of the head box is provided with a sensor corresponding to the sensing block.

[0015] Compared with the existing technology, the advantages of the present invention are: the high-precision hole grinding equipment has a compact structure, and the grinding effect of the workpiece is improved through the bidirectional rotation of the clamp and the grinding rod. The drive is provided by setting a rotating eccentric wheel. When the eccentric wheel rotates, the contact ring drives the eccentric wheel to rotate, so that the drive shaft repeatedly moves along its axial direction, avoiding repeated grinding marks and improving processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 Shown is a structural schematic diagram of a high-precision hole grinding device in a specific embodiment of the present utility model.

[0018] Figure 2 Shown is a transmission schematic diagram of a high-precision hole grinding device in a specific embodiment of the present utility model.

[0019] Figure 3 Shown is a schematic diagram of the positions of the grinding head and the anti-backlash rack in a specific embodiment of the present utility model.

[0020] Figure 4 Shown is a structural schematic diagram of a grinding head in a specific embodiment of the present utility model.

[0021] Figure 5 Shown is a cross-sectional schematic diagram of a grinding head in a specific embodiment of the present invention.

[0022] Figure 6 Shown is a schematic diagram of the position of the eccentric wheel in a specific embodiment of the present utility model. DETAILED DESCRIPTION

[0023] The following is a detailed description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] Ginseng Figures 1 to 6 As shown, a high-precision hole grinding equipment includes a horizontally arranged workbench, a fixture 1 rotatably arranged on the top surface of the workbench and a machine head that is lifted and lowered directly above the fixture 1. The machine head includes a column 2 slidably connected to the workbench, a machine head box 3 installed on the column 2 and a grinding head 4 set directly above the fixture 1 through the machine head box 3. The grinding head 4 includes a cylinder sleeve 41 fixed to the machine head box 3, a driving shaft 43 sliding in the cylinder sleeve 41 through a lifting sleeve 42 and a grinding rod 44 connected to the end of the driving shaft 43. A first bearing seat 45 corresponding to the driving shaft 43 is provided at the top of the cylinder sleeve 41. The driving shaft 43 is rotatably set on the first bearing seat 45 through a shaft sleeve 46. The shaft sleeve 46 is connected to the first motor 5 through a synchronous belt. A second motor 6 for driving the lifting sleeve 42 to rise and fall is provided on the side of the machine head box 3.

[0027] In this technical solution, the workbench and the machine head box are both existing structures, which are formed by splicing or processing plates. A protective cover is provided on the machine head box, in which the first motor and synchronous belt are covered to avoid accidents such as pinching. A guard plate is also provided on the top of the workbench to prevent particles generated by processing from splashing and to prevent debris from entering the working range of the grinding head. The fixture uses a conventional three-jaw chuck and is rotatably set on the workbench. The grinding head and the fixture rotate in both directions to improve the grinding effect of the workpiece, and the grinding rod of the grinding head can move straight along its axial direction while rotating, which is suitable for deep hole processing.

[0028] For example, see Figure 1 and Figure 2 As shown, a cabinet is provided on the bottom surface of the workbench, and a third motor 7 connected to the clamp 1 through a belt drive and a fourth motor 8 connected to the column 2 through a screw drive are provided in the cabinet.

[0029] The technical scheme is characterized in that the cabinet is of a conventional structure and is formed by splicing profiles and plates, is used for supporting the workbench, and has the third motor and the fourth motor installed therein to avoid accidents such as pinch injury, the cabinet is provided with a control device formed by a touch screen on one side, conventional heat dissipation holes can be processed in the wall plate of the cabinet, and conventional heat dissipation fans are arranged to avoid high temperature in the cabinet and affect the normal operation of the third motor and the fourth motor, the third motor is fixed to the inner wall of the cabinet through a conventional motor base, and the output shaft of the third motor is drivingly connected to the rotating shaft of the three-jaw chuck through a conventional belt device, the fourth motor is fixed to the inner wall of the cabinet through a conventional motor base, and the output shaft of the fourth motor is drivingly connected to the lead screw through a conventional gear transmission, the bottom end of the lead screw is rotatably arranged on the bottom wall of the cabinet through a bearing seat, the column is of a hollow structure and has a bottom end connected to the nut of the lead screw, and the column is driven to ascend and descend by the rotation of the lead screw, so that the whole head is driven to ascend and descend, thereby meeting the requirements of production of workpieces of different lengths.

[0030] Exemplarily, as shown in Figure 1 and Figure 2 , the top surface of the workbench is provided with a guide sleeve 9 corresponding to the column 2, and the column 2 is slidingly arranged in the guide sleeve 9.

[0031] In the technical scheme, the guide sleeve is of an existing structure and is fixed to the workbench through bolts, thereby improving the moving precision of the column, the column is provided with a central back plate, and the bottom of the head cabinet is provided with a positioning block corresponding to the central back plate, so that the head cabinet and the column can be quickly positioned and installed in the circumferential direction, and the structure of the central back plate and the positioning block is not required as long as the head cabinet and the column can be positioned in the circumferential direction.

[0032] Exemplarily, as shown in Figure 1 and Figure 2 , the surface of the column 2 is provided with a guide groove in the axial direction thereof, and the inner wall of the guide sleeve 9 is embedded with a guide piece sliding in the guide groove.

[0033] In the technical scheme, the guide piece directly utilizes an existing key structure to limit the rotation of the column in cooperation with the guide groove, thereby avoiding rotation of the column during rotation of the lead screw.

[0034] Exemplarily, as shown in Figures 1 to 5 , the outer wall of the lifting sleeve 42 is provided with a plurality of driving teeth 421, the side wall of the cylinder sleeve 41 is provided with a plurality of avoiding holes 411 corresponding to the driving teeth, a gear shaft 47 meshing with the driving teeth is rotatably arranged in the head cabinet 3, one end of the gear shaft 47 is drivingly connected to the second motor 6 through a speed reducer, and the other end is provided with a hand wheel 48.

[0035] In this technical solution, the second motor is a conventional servo reduction motor, and is directly connected to the end of the gear shaft through a coupling, or the output shaft of the motor is connected to the gear shaft through a conventional reduction box, so that the lifting sleeve is driven to rise and fall through the gear shaft, that is, the grinding rod is driven to move along its axial direction. It can also be disconnected from the second motor through the fork in the reduction box, and the rotation of the gear shaft is controlled by the handwheel. The control principle of the gear shaft is existing technology and will not be described here one by one.

[0036] For example, see Figures 1 to 5 As shown, a backlash-eliminating rack 49 is provided on the side of the gear shaft away from the lifting sleeve 42 , and the backlash-eliminating rack 49 is slidably connected to the head box 3 through a spring rod 410 .

[0037] In this technical solution, the spring rod is an existing structure and is installed on the head box through end covers and bolts. The anti-backlash rack is a cylindrical structure with an open top, and its bottom is connected to the telescopic short of the spring rod by bolts. The side of the anti-backlash rack is processed with anti-backlash teeth that engage with the gear shaft. The axial force is applied to the anti-backlash rack through the spring rod without interfering with the normal operation of the gear shaft, so that the gear shaft is always engaged with the driving teeth of the lifting sleeve, thereby improving production accuracy.

[0038] For example, see Figures 1 to 6 As shown, the drive shaft 43 includes a spline shaft 431, a first rotating shaft 432, a connecting shaft 433, a second rotating shaft 434 and an installation shaft 435 arranged in sequence, and the sleeve 46 is slidably sleeved on the spline shaft 431, and its inner wall is provided with a plurality of key grooves corresponding to the spline shaft 431, a first linear bearing 420 is provided between the first rotating shaft 432 and the lifting sleeve 42, a second linear bearing 430 is provided between the second rotating shaft 434 and the lifting sleeve 42, and the grinding rod 44 is connected to the end of the installation shaft 435.

[0039] In this technical solution, the drive shaft is integrally formed from the same rod to ensure the coaxiality between the spline shaft, the first rotating shaft, the connecting shaft, the second rotating shaft and the mounting shaft. The top end of the sleeve is provided with a synchronous wheel (not shown) and is connected to the first motor through a synchronous belt to drive the sleeve to rotate. The inner wall of the sleeve is provided with a number of keyways corresponding to the spline shaft. The spline shaft and the keyway cooperate to fix the drive shaft and the sleeve circumferentially, so that the sleeve drives the drive shaft to rotate, that is, drives the grinding rod to rotate, and at the same time does not interfere with the axial sliding of the drive shaft, that is, the lifting sleeve drives the drive shaft to slide.

[0040] For example, see Figures 1 to 6As shown, a toggle shaft 436 is connected between the connecting shaft 433 and the second rotating shaft 434. Eccentric wheels 440 are respectively arranged on both sides of the toggle shaft 436 for rotation through the rotating shaft. The rotating shaft is arranged along the radial direction of the toggle shaft 436. A contact ring 450 corresponding to the eccentric wheel 440 is embedded in the inner wall of the lifting sleeve 42. A stepped through hole is arranged in the contact ring 450, which are a first stepped hole and a second stepped hole respectively. The first stepped hole is slidably sleeved on the toggle shaft 436, and the second stepped hole is slidably sleeved on the second rotating shaft 434.

[0041] In this technical solution, the rotating shaft passes through the toggle shaft along the radial direction of the toggle shaft, and is connected to a rotating eccentric wheel at both ends. A contact ring is embedded in the inner wall of the lifting sleeve, and the eccentric wheel rolls and abuts against the top surface of the contact ring. During the rotation of the driving shaft, the eccentric wheel rolls along the top surface of the contact ring, thereby driving the driving shaft to repeatedly move along its axial direction relative to the contact ring, so that the grinding rod completes the corresponding axial processing, avoids repeated grinding marks, and improves processing accuracy. By setting the stepped through hole, the axial relative sliding between the contact ring and the driving shaft is avoided. The bottom end of the contact ring abuts against the top end of the second linear bearing, and the bottom end of the second linear bearing is axially fixed to the inner wall of the lifting sleeve by a conventional retaining spring.

[0042] For example, see Figures 1 to 6 As shown, the first linear bearing 420 is connected to the inner wall of the lifting sleeve 42 through the bearing sleeve 460, and the end of the first rotating shaft 432 close to the spline shaft 431 is elastically abutted against the bearing sleeve 460 through the spring sleeve 470, and a first plane bearing 480 is arranged between the first rotating shaft 432 and the spring sleeve 470.

[0043] In this technical solution, the two ends of the bearing sleeve are axially fixed to the inner wall of the lifting sleeve by conventional structures such as the step surface of the inner wall of the lifting sleeve and the retaining spring. The two ends of the first linear bearing are axially fixed to the inner wall of the bearing sleeve by conventional structures such as the step surface of the inner wall of the bearing sleeve and the retaining spring. The shoulder end face of the first rotating shaft elastically abuts the bearing sleeve through a spring sleeve. The spring sleeve is a conventional elastic structure, which exerts an axial force on the drive shaft to ensure that the eccentric wheel always abuts the contact ring, thereby driving the drive shaft to repeatedly move along its axial direction. The two ends of the spring sleeve are respectively rotated and abutted against the drive shaft through the bearing sleeve and the first plane bearing, that is, the spring sleeve does not rotate with the drive shaft, avoiding failure caused by its torsion, etc. A locking cover is slidingly provided on the end of the lifting sleeve close to the grinding rod. The locking cover blocks the bottom end of the drive sleeve to prevent debris from entering the interior of the drive sleeve. The locking cover is rotatably sleeved on the mounting shaft through the second plane bearing to improve the rotation accuracy of the drive shaft.

[0044] For example, see Figures 1 to 3 As shown, the outer wall of the lifting sleeve 42 is connected to the sensing block 490, the side wall of the cylinder sleeve 41 is provided with a slide groove corresponding to the sensing block, and the side wall of the head box 3 is provided with a sensor 31 corresponding to the sensing block.

[0045] In this technical solution, the sensor is set on the head box through a conventional bracket, and cooperates with the sensor block to limit the maximum stroke of the lifting sleeve to avoid collision, etc.

[0046] In summary, the high-precision hole grinding equipment has a compact structure. The grinding effect of the workpiece is improved through the bidirectional rotation of the fixture and the grinding rod. The drive is provided by setting a rotating eccentric wheel. When the eccentric wheel rotates, the contact ring drives the eccentric wheel to rotate, so that the drive shaft repeatedly moves along its axial direction, avoiding repeated grinding marks and improving processing accuracy.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0048] The above description is only a specific implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A high-precision hole grinding device, characterized in that: It includes a horizontally arranged workbench, a clamp rotatably arranged on the top surface of the workbench and a machine head that is lifted and lowered directly above the clamp. The machine head includes a column slidably connected to the workbench, a machine head box installed on the column and a grinding head arranged directly above the clamp through the machine head box. The grinding head includes a cylinder sleeve fixed to the machine head box, a driving shaft sliding in the cylinder sleeve through a lifting sleeve and a grinding rod connected to the end of the driving shaft. The top of the cylinder sleeve is provided with a first bearing seat corresponding to the driving shaft. The driving shaft is rotatably set on the first bearing seat through a sleeve. The sleeve is connected to the first motor through a synchronous belt. The side of the machine head box is provided with a second motor that drives the lifting sleeve to rise and fall.

2. The high-precision hole grinding equipment according to claim 1, characterized in that: A cabinet is provided on the bottom surface of the workbench, and a third motor connected to the clamp through a belt drive and a fourth motor connected to the column through a screw drive are provided in the cabinet.

3. The high-precision hole grinding equipment according to claim 1, characterized in that: The top surface of the workbench is provided with a guide sleeve corresponding to the column, and the column is slidably arranged in the guide sleeve.

4. The high-precision hole grinding equipment according to claim 3, characterized in that: A guide groove is provided on the surface of the column along its axial direction, and a guide piece that slides in the guide groove is embedded in the inner wall of the guide sleeve.

5. The high-precision hole grinding equipment according to claim 1, characterized in that: The outer wall of the lifting sleeve is provided with a plurality of driving teeth, the side wall of the cylinder sleeve is provided with avoidance holes corresponding to the driving teeth, and a gear shaft engaged with the driving teeth is rotatably provided in the head box. One end of the gear shaft is connected to the second motor through a reduction gear box, and the other end is provided with a handwheel.

6. The high-precision hole grinding equipment according to claim 5, characterized in that: A backlash-eliminating rack is provided on the side of the gear shaft facing away from the lifting sleeve, and the backlash-eliminating rack is slidably connected to the head box through a spring rod.

7. The high-precision hole grinding equipment according to claim 1, characterized in that: The drive shaft includes a spline shaft, a first rotating shaft, a connecting shaft, a second rotating shaft and an installation shaft arranged in sequence. The sleeve is slidably sleeved on the spline shaft, and its inner wall is provided with a plurality of key grooves corresponding to the spline shaft. A first linear bearing is provided between the first rotating shaft and the lifting sleeve, and a second linear bearing is provided between the second rotating shaft and the lifting sleeve. The grinding rod is connected to the end of the installation shaft.

8. The high-precision hole grinding equipment according to claim 7, characterized in that: A toggle shaft is connected between the connecting shaft and the second rotating shaft, and eccentric wheels are respectively arranged on both sides of the toggle shaft for rotation through the rotating shaft. The rotating shaft is arranged along the radial direction of the toggle shaft, and a contact ring corresponding to the eccentric wheel is embedded in the inner wall of the lifting sleeve. A stepped through hole is provided in the contact ring, which are a first stepped hole and a second stepped hole respectively, wherein the first stepped hole is slidably sleeved on the toggle shaft, and the second stepped hole is slidably sleeved on the second rotating shaft.

9. The high-precision hole grinding equipment according to claim 8, characterized in that: The first linear bearing is connected to the inner wall of the lifting sleeve through a bearing sleeve. One end of the first rotating shaft close to the spline shaft elastically abuts against the bearing sleeve through a spring sleeve. A first plane bearing is provided between the first rotating shaft and the spring sleeve.

10. The high-precision hole grinding equipment according to claim 1, characterized in that: The outer wall of the lifting sleeve is connected to a sensing block, the side wall of the cylinder sleeve is provided with a sliding groove corresponding to the sensing block, and the side wall of the head box is provided with a sensor corresponding to the sensing block.

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