Cam shaft grinding machine capable of switching main shaft machining modes

Abstract

The invention relates to the technical field of cam shaft machining, in particular to a cam shaft grinding machine capable of switching main shaft machining modes, which comprises a rotating roller, two telescopic rods, two tensioning wheels, a grinding belt and a transmission part, the rotating roller is rotationally arranged, one ends of the two telescopic rods are rotationally arranged on a machine tool, and the other ends of the two telescopic rods are rotationally arranged on the transmission part; each tensioning wheel is rotationally arranged at the end, away from the machine tool, of one telescopic rod, the two tensioning wheels are located between the rotating roller and the cam shaft, and the grinding belt is wound around the rotating roller and the two tensioning wheels. And the rotation angle of the telescopic rod is inversely proportional to the speed of the rotating roller. And the telescopic rods are arranged, when the contact pressure between the cam on the cam shaft and the grinding belt is increased, the grinding belt can drive the two telescopic rods to rotate and contract so as to adapt to the cam on the cam shaft and prevent the cam on the cam shaft from being broken, the grinding degree of the grinding belt on the cam on the cam shaft can be improved at the moment, and the grinding quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of camshaft processing, and in particular to a camshaft grinder capable of switching spindle processing modes. Background Art

[0002] In the field of modern mechanical manufacturing, camshafts are key components of engines and other equipment, and their processing accuracy directly affects the performance and reliability of the entire equipment. The cams on the surface of camshafts have a variety of different profile shapes and sizes, and precision grinding is an important part of the production process.

[0003] Existing camshaft grinders have certain limitations in structure and function. The grinding wheel belt is usually in a fixed position, which is difficult to adapt to the grinding needs of the cam on the camshaft. Due to the different distances between the circumference of the cam and the grinding belt, the contact pressure between the cam and the grinding belt will change during grinding, making the grinding degree of the circumference of the cam uneven, reducing the processing quality and product qualification rate; if the distance between the grinding belt and the cam is adjusted by manual adjustment, the operator needs to frequently adjust the various parameters of the grinder according to the cam size, which not only consumes a lot of manpower and time, but also seriously affects the processing efficiency and is difficult to meet the needs of large-scale production. If the design uses an electronic control adjustment system to automatically adapt to the grinding of different cam sizes, although precise control can be achieved in theory, the electronic control system has a complex structure and needs to be equipped with a large number of sensors, controllers and complex programming logic. This not only increases the manufacturing cost of the grinder, but also increases the maintenance difficulty and failure rate of the equipment. For some small and medium-sized manufacturing enterprises, its application and promotion are greatly restricted. Summary of the invention

[0004] Based on this, it is necessary to provide a camshaft grinder with switchable spindle processing mode to address the problem of inconsistent grinding degrees of various cam circumferential surfaces during grinding of the current camshaft.

[0005] The above purpose is achieved through the following technical solutions: A camshaft grinder capable of switching spindle processing modes comprises a machine tool and a grinding mechanism, wherein the machine tool is fixedly arranged, the camshaft is rotatably arranged on the machine tool around its own axis, the axis of the camshaft extends along a first direction, the grinding mechanism comprises a fixed seat, a grinding assembly and a driving assembly, the fixed seat is slidably arranged on the machine tool along a first direction and a second direction, the second direction is perpendicular to the first direction on the same plane, the grinding assembly comprises a roller, a telescopic rod, a tensioning wheel, a grinding belt and a transmission part, the roller is rotatably arranged on the fixed seat, and the rotation axis of the roller extends along the first direction, the driving assembly is used to drive the roller to rotate, the telescopic rod There are two tension wheels, one end of the two telescopic rods is rotatably set above the fixed seat, and the rotation axes of the two telescopic rods extend along the first direction, each tension wheel is rotatably set at one end of one of the telescopic rods away from the fixed seat, the two tension wheels are located between the roller and the camshaft, the grinding belt is wound around the roller and the two tension wheels, and the part of the grinding belt located between the two tension wheels can contact the camshaft; the grinding belt is always in a taut state, and the transmission part is used to change the transmission ratio between the driving assembly and the roller by the rotation angle of the telescopic rod, and the rotation angle of the telescopic rod is inversely proportional to the speed of the roller.

[0006] Preferably, the driving assembly includes a rotating shaft and a motor. The rotating shaft is arranged on a fixed seat and rotates around its own axis. The axis of the rotating shaft extends along a first direction. The rotating shaft drives the roller to rotate through a transmission part. The motor is fixedly installed on the fixed seat, and the motor is used to drive the rotating shaft to rotate.

[0007] Preferably, the grinding mechanism further comprises a fixed shaft, which is fixedly mounted on the fixed seat, and the axis of the fixed shaft extends along the first direction, the rotating roller is sleeved on the fixed shaft, and the rotating roller is rotatably connected to the fixed shaft.

[0008] Preferably, the transmission part includes a first fixed ring, a driving wheel and an adjusting member, the first fixed ring is sleeved on the rotating shaft, and the first fixed ring is rotatably connected to the rotating shaft, the first fixed ring is fixedly connected to the fixing seat, two driving wheels are provided, the two driving wheels are sleeved on the rotating shaft, and the driving wheels are fixedly connected to the rotating shaft, and the two driving wheels are symmetrical about the first fixed ring; there are two adjusting members, each of which includes a second fixed ring, a guide column, a stud, a nut and a guide wheel, the second fixed ring is sleeved on the fixed shaft, the two ends of the guide column are respectively connected to the first fixed ring and the second fixed ring, and the axis of the rotating shaft and the axis of the fixed shaft and the axis of the guide column are located in the same plane, and the guide column is inclined with the rotating shaft The guide wheels are arranged obliquely, and the studs are all sleeved on the guide columns, and the studs are slidably arranged along the axial direction of the guide columns. The nuts are threadedly connected to the studs, and the nuts are rotatably arranged on the first fixed ring around the rotation axis. The two telescopic rods are located on both sides of the first fixed ring, and the two telescopic rods are respectively rotatably connected to the first fixed ring. The nut is rollingly connected to one of the telescopic rods. The guide wheel is sleeved on the studs, and the guide wheel is rotatably connected to the studs. Each driving wheel is provided with a conical surface, and the roller is provided with two conical surfaces symmetrical about its center. A guide wheel in each adjusting member is rollingly connected to a driving wheel and a conical surface of the roller, and the generatrixes of the two conical surfaces at the contact position with the guide wheel are parallel to each other.

[0009] Preferably, a plurality of transmission parts are provided, and the plurality of transmission parts are arranged sequentially along the first direction on the fixing seat.

[0010] Preferably, each telescopic rod includes a fixed part, a movable part and a spring, the fixed part is sleeved on the rotating shaft, the movable part is slidably arranged on the fixed part along the radial direction of the rotating shaft, the two ends of the spring are respectively connected to the fixed part and the movable part, and the spring is telescopic along the sliding direction of the movable part on the fixed part; a torsion spring is provided between each telescopic rod and the first fixed ring; under normal conditions, the telescopic rod is in an extended state, and the tensioning wheels on the two telescopic rods are farthest apart.

[0011] Preferably, the elastic force of the spring is greater than the torsion force of the torsion spring.

[0012] Preferably, a ratchet mechanism is provided between each tensioning wheel and the corresponding telescopic rod, and the ratchet mechanism is used to enable the tensioning wheel to rotate unidirectionally on the telescopic rod.

[0013] Preferably, the grinding mechanism further includes a first power mechanism, and the first power mechanism is used to control the fixing seat to slide along the first direction and the second direction.

[0014] Preferably, a chuck, a clamping fixture and a second power mechanism are provided on the machine tool. The chuck is rotatable around its own axis and is arranged on the machine tool. The rotation axis of the chuck extends along a first direction. The chuck is used to clamp the camshaft. The clamping fixture is slidably arranged on the machine tool along the first direction and can abut against one end of the camshaft away from the chuck. The second power mechanism is used to drive the chuck to rotate.

[0015] The beneficial effects of the present invention are as follows: a telescopic rod is arranged through the cooperation between the grinding belt and the camshaft; when the contact pressure between the cam on the camshaft and the grinding belt increases, the grinding belt will drive the two telescopic rods to rotate and contract, thereby adapting to the cam on the camshaft to avoid breakage; at this time, the grinding belt will increase the degree of grinding of the cam on the camshaft; in order to make the grinding degree of the cam at various positions on the camshaft consistent, the transmission part will control the rotation speed of the roller to reduce, thereby reducing the grinding degree of the cam on the camshaft, so that the grinding degree of the cam at various positions on the camshaft is as consistent as possible; at the same time, multiple cams with different diameters on the camshaft can also achieve a relatively consistent state of grinding degree, thereby ensuring the grinding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a camshaft grinder capable of switching spindle processing modes provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of a grinding mechanism of a camshaft grinder capable of switching spindle processing modes provided by an embodiment of the present invention; Figure 3 A top view of a grinding mechanism of a camshaft grinder capable of switching spindle processing modes provided by an embodiment of the present invention; Figure 4 for Figure 3 The enlarged view of point A in the middle; Figure 5 A split diagram of a grinding mechanism of a camshaft grinder capable of switching spindle processing modes provided by an embodiment of the present invention; Figure 6 A split diagram of the transmission part of a camshaft grinder capable of switching spindle processing modes provided in an embodiment of the present invention.

[0017] in: 100, machine tool; 101, fixed seat; 102, rotating roller; 103, telescopic rod; 104, tensioning wheel; 105, grinding belt; 106, rotating shaft; 110, fixed shaft; 111, first fixed ring; 112, driving wheel; 113, second fixed ring; 114, guide column; 115, stud; 116, nut; 117, guide wheel; 201, chuck; 202, tightening fixture. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] like Figures 1 to 6As shown, an embodiment of the present invention provides a camshaft grinder with switchable spindle processing modes, including a machine tool 100 and a grinding mechanism, wherein the machine tool 100 is fixedly arranged, and the camshaft is rotatably arranged on the machine tool 100 around its own axis, and the axis of the camshaft extends along a first direction, and the grinding mechanism includes a fixed seat 101, a grinding assembly and a driving assembly, and the fixed seat 101 is slidably arranged on the machine tool 100 along a first direction and a second direction, and the second direction is perpendicular to the first direction on the same plane, and the grinding assembly includes a roller 102, a telescopic rod 103, a tensioning wheel 104, a grinding belt 105 and a transmission part, and the roller 102 is rotatably arranged on the fixed seat 101, and the rotation axis of the roller 102 extends along the first direction, and the driving assembly is used to drive the roller 102 to rotate, and the telescopic rod 103 There are two tensioning wheels 104, one end of the two telescopic rods 103 is rotatably set above the fixed seat 101, and the rotation axis of the two telescopic rods 103 extends along the first direction, each tensioning wheel 104 is rotatably set at one end of one of the telescopic rods 103 away from the fixed seat 101, the two tensioning wheels 104 are located between the roller 102 and the camshaft, the grinding belt 105 is wound around the roller 102 and the two tensioning wheels 104, and the part of the grinding belt 105 located between the two tensioning wheels 104 can contact the camshaft; the grinding belt 105 is always in a taut state, and the transmission part is used to change the transmission ratio between the driving assembly and the roller 102 by the rotation angle of the telescopic rod 103, and the rotation angle of the telescopic rod 103 is inversely proportional to the speed of the roller 102.

[0022] Through the cooperation between the grinding belt 105 and the camshaft, a telescopic rod 103 is set. When the contact pressure between the cam on the camshaft and the grinding belt 105 increases, the grinding belt 105 will drive the two telescopic rods 103 to rotate and contract, so as to adapt to the cam on the camshaft to avoid breakage. At this time, the grinding belt 105 will increase the degree of grinding of the cam on the camshaft. In order to make the grinding degree of the cam at each position on the camshaft consistent, the transmission part will control the rotation speed of the roller 102 to reduce, thereby reducing the grinding degree of the cam on the camshaft, so that the grinding degree of the cam at each position on the camshaft is as consistent as possible; at the same time, multiple cams with different diameters on the camshaft can also achieve a relatively consistent grinding degree, thereby ensuring the grinding quality.

[0023] In this embodiment, the driving assembly includes a rotating shaft 106 and a motor. The rotating shaft 106 is rotatable around its own axis and is arranged on the fixed base 101. The axis of the rotating shaft 106 extends along the first direction. One end of the two telescopic rods 103 away from the tensioning wheel 104 is sleeved on the rotating shaft 106, and each telescopic rod 103 is rotatably connected to the rotating shaft 106. The motor is fixedly installed on the fixed base 101, and the motor is used to drive the rotating shaft 106 to rotate. The rotating shaft 106 drives the roller 102 to rotate through the transmission part, and the rotation of the rotating shaft 106 provides power for the roller 102.

[0024] In this embodiment, the grinding mechanism also includes a fixed shaft 110, which is fixedly installed on the fixed seat 101, and the axis of the fixed shaft 110 extends along the first direction, the axis of the camshaft, the axis of the rotating shaft 106 and the axis of the fixed shaft 110 are in the same plane, and the axis of the camshaft, the axis of the rotating shaft 106 and the axis of the fixed shaft 110 are arranged in sequence along the second direction, the fixed shaft 110 is located on the side of the rotating shaft 106 away from the camshaft, the roller 102 is sleeved on the fixed shaft 110, and the roller 102 is rotatably connected to the fixed shaft 110.

[0025] In this embodiment, the transmission part includes a first fixing ring 111, a driving wheel 112 and an adjusting member. The first fixing ring 111 is sleeved on the rotating shaft 106, and the first fixing ring 111 and the rotating shaft 106 are rotatably connected. The first fixing ring 111 is fixedly connected to the fixing seat 101. There are two driving wheels 112, which are sleeved on the rotating shaft 106, and the driving wheels 112 are fixedly connected to the rotating shaft 106. The two driving wheels 112 are symmetrical about the first fixing ring 111; there are two adjusting members, each of which includes a second fixing ring 113, a guide column 114, a stud 115, and a nut 116. 6 and guide wheel 117, the second fixing ring 113 is sleeved on the fixed shaft 110, the two ends of the guide column 114 are connected to the first fixing ring 111 and the second fixing ring 113 respectively, and the axis of the rotating shaft 106 and the axis of the fixed shaft 110 and the axis of the guide column 114 are located in the same plane, the guide column 114 and the rotating shaft 106 are inclined, the studs 115 are sleeved on the guide columns 114, and the studs 115 are slidably arranged along the axis direction of the guide columns 114, the guide columns 114 are multi-prisms, the studs 115 cannot rotate around the axis of the guide columns 114 on the guide columns 114, and the nuts 116 are threadedly connected to the studs 115 The first fixing ring 111 is connected to the first fixing ring 111, and the nut 116 is rotatably arranged around the rotating shaft 106. The two telescopic rods 103 are located on both sides of the first fixing ring 111, and the two telescopic rods 103 are respectively rotatably connected to the first fixing ring 111. The nut 116 is rollingly connected to one of the telescopic rods 103. When the telescopic rod 103 rotates around the rotating shaft 106, it can drive the corresponding nut 116 to rotate around the guide column 114; the guide wheel 117 is sleeved on the stud 115, and the guide wheel 117 is rotatably connected to the stud 115. The two second fixing rings 113 in the two adjusting members are symmetrically arranged about the roller 102. The two The stud 115 and the nut 116 are rotationally symmetrical about the center of the first fixed ring 111, each driving wheel 112 is provided with a conical surface, and the roller 102 is provided with two conical surfaces symmetrical about its center. A guide wheel 117 in each adjusting member is rollingly connected to a driving wheel 112 and a conical surface of the roller 102 respectively, and the generatrixes of the two conical surfaces at the contact positions with the guide wheel 117 are parallel to each other, the conical surface on the driving wheel 112 and the conical surface on the roller 102 are both provided with a large end and a small end, the small ends of the two conical surfaces of the two driving wheels 112 are close to each other, and the large ends of the two conical surfaces on the roller 102 are close to each other.

[0026] A gear is rotatably provided on the first fixed ring 111, and a rack plate is provided on the side where the two telescopic rods 103 are close to each other. The two rack plates are respectively engaged with the gears. After the cam on the camshaft rotates, its protruding part contacts the grinding belt 105 and pushes the grinding belt 105. One of the telescopic rods 103 rotates and drives the gear to rotate through the rack plate connected to it. The rotation of the gear drives the other rack plate to rotate. The rotation of the other rack plate drives the other telescopic rod 103 to rotate. The rotation angles of the two telescopic rods 103 are consistent, so that the rotation of the roller 102 is smoother.

[0027] When the two telescopic rods 103 rotate and drive the two tensioning wheels 104 to approach each other, the two telescopic rods 103 respectively drive the two nuts 116 to rotate, and the two nuts 116 rotate through the corresponding studs 115 to drive the two guide wheels 117 to approach the large end of the conical surface on the roller 102, thereby reducing the rotation speed of the roller 102; conversely, when the two telescopic rods 103 rotate and drive the two tensioning wheels 104 to move away from each other, the rotation speed of the roller 102 increases.

[0028] In this embodiment, a plurality of transmission parts are provided, and the plurality of transmission parts are sequentially arranged along the first direction on the fixing seat 101. The plurality of grinding belts 105 in the plurality of transmission parts can independently grind the plurality of cams on the camshaft at the same time, thereby improving the grinding efficiency.

[0029] In this embodiment, each telescopic rod 103 includes a fixed part, a movable part and a spring, the fixed part is sleeved on the rotating shaft 106, the movable part is slidably arranged on the fixed part along the radial direction of the rotating shaft 106, the two ends of the spring are respectively connected to the fixed part and the movable part, and the spring is extended and retracted along the sliding direction of the movable part on the fixed part; a torsion spring is provided between each telescopic rod 103 and the first fixed ring 111; under normal conditions, the telescopic rod 103 is in an extended state, and the tensioning wheels 104 on the two telescopic rods 103 are the farthest apart, and the grinding belt 105 under normal conditions is in a taut state under the action of the spring and the torsion spring, and the two tensioning wheels 104 tend to move away from each other under the action of the torsion spring.

[0030] In this embodiment, the elastic force of the spring is greater than the torsion force of the torsion spring. When the grinding belt 105 contacts the cam on the camshaft, the spring will not be compressed. If the contact pressure between the cam and the grinding belt 105 increases, the grinding belt 105 will pull the two tensioning wheels 104 closer to each other until the two tensioning wheels 104 can no longer get close to each other. Then the spring will be compressed, ensuring that the grinding belt 105 will not break.

[0031] In this embodiment, a ratchet mechanism is provided between each tensioning wheel 104 and the corresponding telescopic rod 103, and the ratchet mechanism is used to make the tensioning wheel 104 rotate unidirectionally on the telescopic rod 103. The camshaft and the grinding belt 105 are in a position where they contact each other, and their movement directions are opposite. When the raised portion of the cam on the camshaft contacts the grinding belt 105, the abutment force between the cam and the grinding belt 105 will increase, and the friction between them will increase. The camshaft may drive the grinding belt 105 to rotate in the opposite direction, causing the grinding belt 105 to slip on the roller 102, and the camshaft and the grinding belt 105 are relatively stationary, and the grinding effect is reduced. The ratchet is provided so that the tensioning wheel 104 can only rotate in one direction, providing resistance to the reverse rotation of the grinding belt 105, thereby improving the grinding effect.

[0032] In this embodiment, the grinding mechanism also includes a first power mechanism, which is used to control the fixed seat 101 to slide along the first direction and the second direction. During the grinding process, before the first power mechanism drives the fixed seat 101 to move along the first direction, it will first drive the fixed seat 101 along the second direction away from the camshaft. At this time, the grinding belt 105 will be disengaged from the cam in contact with the camshaft, and a gap is provided between the cross-section of the grinding belt 105 perpendicular to the first direction and the cross-sections of all the cams on the camshaft perpendicular to the first direction. Then the first power mechanism drives the fixed seat 101 to move along the first direction to the position of the next cam on the camshaft. During the movement, the grinding belt 105 will not contact the cam, thereby avoiding collision between the grinding belt 105 and the end face of the cam on the camshaft.

[0033] In this embodiment, a chuck 201, a clamping fixture 202 and a second power mechanism are provided on the machine tool 100. The chuck 201 is rotatably arranged on the machine tool 100 around its own axis. The rotation axis of the chuck 201 extends along a first direction. The chuck 201 is used to clamp the camshaft. The chuck 201 is a three-jaw chuck 201 that can clamp the camshaft. The clamping fixture 202 is slidably arranged on the machine tool 100 along the first direction and can abut against one end of the camshaft away from the chuck 201. The second power mechanism is used to drive the chuck 201 to rotate.

[0034] The working principle of the camshaft grinder with switchable spindle processing mode provided in the above embodiment is: First, the camshaft is placed in the chuck 201 and clamped by the chuck 201, and then the clamping fixture 202 is pushed on the machine tool 100 along the first direction to approach the camshaft until the camshaft is clamped, and then the second power mechanism is started, the second power mechanism drives the chuck 201 to rotate, and the chuck 201 drives the camshaft to rotate, and then the motor and the first power mechanism are started, the motor drives the rotating shaft 106 to rotate, the rotating shaft 106 drives the driving wheel 112 to rotate, and the driving wheel 112 drives the guide wheel 117 to rotate through the cooperation between its conical surface and the guide wheel 117, and the guide wheel 117 is driven to rotate. The wheel 117 drives the roller 102 to rotate through the corresponding conical surface on the roller 102, and the roller 102 drives the grinding belt 105 to rotate, and the grinding belt 105 drives the tensioning wheel 104 to rotate. At the same time, the first power mechanism drives the fixed seat 101 to approach the camshaft along the second direction until the grinding belt 105 can fully contact the camshaft. When the protruding part on the camshaft rotates to contact the grinding belt 105, the pressure on the grinding belt 105 increases, and the grinding belt 105 will drive the telescopic rod 103 to rotate on the rotating shaft 106. The rotation of the telescopic rod 103 The corresponding rack plate drives the gear to rotate, that is, the two telescopic rods 103 rotate synchronously in opposite directions. If the rotation of the telescopic rod 103 is not enough to cope with the pressure change on the grinding belt 105, the telescopic rod 103 will be compressed to prevent the grinding belt 105 from breaking. At this time, the pressure between the cam of the camshaft and the grinding belt 105 increases. When the telescopic rod 103 rotates, the telescopic rod 103 will drive the corresponding nut 116 to rotate. The rotation of the nut 116 drives the stud 115 threadedly connected thereto to slide on the guide post 114, and the guide post 114 moves toward the nut 11 6 approaches and drives the guide wheel 117 to move synchronously, the guide wheel 117 slides on the conical surfaces on the driving wheel 112 and the roller 102, and the guide wheel 117 approaches the small end of the conical surface on the driving wheel 112 and approaches the large end of the conical surface on the roller 102, the transmission ratio between the driving wheel 112 and the roller 102 is reduced, so the rotation speed of the roller 102 is reduced, the speed of the grinding belt 105 is reduced, and the relative speed between the grinding belt 105 and the protruding part of the cam on the camshaft is reduced, so that the grinding degree of the circumferential surface of the cam on the camshaft is as consistent as possible.

[0035] Similarly, when the protruding portion of the cam on the camshaft is separated from the grinding belt 105, the contact pressure between the grinding belt 105 and the cam on the camshaft is reduced, but the relative speed between the two is increased, thereby ensuring the degree of grinding.

[0036] When it is necessary to grind the next cam of a different size, the second power mechanism drives the fixing seat 101 to move in the second direction so that it can fully contact the circumference of the next cam, and then controls the fixing seat 101 to approach the next cam in the first direction until the grinding is completed.

[0037] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A camshaft grinder capable of switching spindle processing modes, characterized in that: include: A machine tool and a grinding mechanism, wherein the machine tool is fixedly arranged, a camshaft is rotatably arranged on the machine tool around its own axis, the axis of the camshaft extends in a first direction, the grinding mechanism comprises a fixed seat, a grinding assembly and a driving assembly, the fixed seat is slidably arranged on the machine tool along a first direction and a second direction, the second direction is perpendicular to the first direction on the same plane, the grinding assembly comprises a roller, a telescopic rod, a tensioning wheel, a grinding belt and a transmission part, the roller is rotatably arranged on the fixed seat, and the rotation axis of the roller extends in the first direction, the driving assembly is used to drive the roller to rotate, the telescopic rod and the tensioning wheel are each provided with two, One end of the two telescopic rods is rotatably set above the fixed seat, and the rotation axes of the two telescopic rods extend along the first direction. Each tensioning wheel is rotatably set at one end of one of the telescopic rods away from the fixed seat. The two tensioning wheels are located between the roller and the camshaft. The grinding belt is wound around the roller and the two tensioning wheels, and the part of the grinding belt located between the two tensioning wheels can contact the camshaft; the grinding belt is always in a taut state, and the transmission part is used to change the transmission ratio between the driving assembly and the roller according to the rotation angle of the telescopic rod, and the rotation angle of the telescopic rod is inversely proportional to the speed of the roller.

2. The camshaft grinder with switchable spindle processing mode according to claim 1, characterized in that: The driving assembly includes a rotating shaft and a motor. The rotating shaft rotates around its own axis and is arranged on a fixed seat. The axis of the rotating shaft extends along a first direction. The rotating shaft drives the roller to rotate through a transmission part. The motor is fixedly installed on the fixed seat, and the motor is used to drive the rotating shaft to rotate.

3. The camshaft grinder with switchable spindle processing mode according to claim 2, characterized in that: The grinding mechanism also includes a fixed shaft, which is fixedly installed on the fixed seat, and the axis of the fixed shaft extends along the first direction. The roller is sleeved on the fixed shaft, and the roller is rotatably connected to the fixed shaft.

4. The camshaft grinder with switchable spindle processing mode according to claim 3, characterized in that: The transmission part includes a first fixed ring, a driving wheel and an adjusting member. The first fixed ring is sleeved on the rotating shaft, and the first fixed ring is rotatably connected to the rotating shaft. The first fixed ring is fixedly connected to the fixing seat. There are two driving wheels, which are sleeved on the rotating shaft and fixedly connected to the rotating shaft. The two driving wheels are symmetrical about the first fixed ring. There are two adjusting members, each of which includes a second fixed ring, a guide column, a stud, a nut and a guide wheel. The second fixed ring is sleeved on the fixed shaft, and the two ends of the guide column are respectively connected to the first fixed ring and the second fixed ring, and the axis of the rotating shaft and the axis of the fixed shaft are in the same plane as the axis of the guide column, and the guide column is inclined with respect to the rotating shaft. The studs are all sleeved on the guide posts, and the studs are slidably arranged along the axial direction of the guide posts, the nuts are threadedly connected to the studs, and the nuts are rotatably arranged on the first fixing ring around the rotation axis, the two telescopic rods are located on both sides of the first fixing ring, and the two telescopic rods are respectively rotatably connected to the first fixing ring, the nut is rollingly connected to one of the telescopic rods, the guide wheel is sleeved on the studs, and the guide wheel is rotatably connected to the studs, each driving wheel is provided with a conical surface, and the roller is provided with two conical surfaces symmetrical about its center, a guide wheel in each adjusting member is respectively rollingly connected to a driving wheel and a conical surface of the roller, and the generatrixes of the two conical surfaces at the contact position with the guide wheel are parallel to each other.

5. The camshaft grinder capable of switching spindle processing modes according to claim 4, characterized in that: A plurality of transmission parts are provided, and the plurality of transmission parts are arranged in sequence along a first direction on the fixing seat.

6. The camshaft grinding machine with switchable spindle processing mode according to claim 3, characterized in that: Each telescopic rod includes a fixed part, a movable part and a spring. The fixed part is sleeved on the rotating shaft, and the movable part is slidably arranged on the fixed part along the radial direction of the rotating shaft. The two ends of the spring are respectively connected to the fixed part and the movable part, and the spring is extended and retracted along the sliding direction of the movable part on the fixed part. A torsion spring is provided between each telescopic rod and the first fixed ring. Under normal circumstances, the telescopic rod is in an extended state, and the tensioning wheels on the two telescopic rods are farthest apart.

7. The camshaft grinding machine with switchable spindle processing mode according to claim 6, characterized in that: The elastic force of the spring is greater than the torsion force of the torsion spring.

8. The camshaft grinding machine with switchable spindle processing mode according to claim 1, characterized in that: A ratchet mechanism is provided between each tensioning wheel and the corresponding telescopic rod, and the ratchet mechanism is used to make the tensioning wheel rotate unidirectionally on the telescopic rod.

9. The camshaft grinding machine with switchable spindle processing mode according to claim 1, characterized in that: The grinding mechanism also includes a first power mechanism, which is used to control the fixing seat to slide along the first direction and the second direction.

10. The camshaft grinding machine with switchable spindle processing mode according to claim 1, characterized in that: The machine tool is provided with a chuck, a clamping fixture and a second power mechanism. The chuck is arranged on the machine tool and rotates around its own axis. The rotation axis of the chuck extends along a first direction. The chuck is used to clamp the camshaft. The clamping fixture is slidably arranged on the machine tool along the first direction and can abut against the end of the camshaft away from the chuck. The second power mechanism is used to drive the chuck to rotate.

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