High-precision centerless grinding machine for valve bridge machining

Abstract

The utility model belongs to the technical field of centerless grinding machines, and particularly relates to a high-precision centerless grinding machine for valve bridge machining, which comprises a grinding machine body, a grinding wheel and a sliding seat are respectively arranged on two sides of the top of the grinding machine body, the sliding seat is transversely and slidably arranged on the grinding machine body, and an adjusting mechanism is arranged between the grinding machine body and the sliding seat. A guide wheel seat sliding transversely is arranged on the sliding seat, an automatic tool retracting mechanism is arranged between the guide wheel seat and the sliding seat, a guide wheel is arranged on the guide wheel seat, and the grinding machine body is provided with a bearing support between the grinding wheel and the guide wheel. Compared with the prior art, the centerless grinding machine has the advantages that on the basis of original manual adjustment of the advancing and retreating stroke, the advancing and retreating stroke of the guide wheel during workpiece replacement is controlled by additionally arranging the high-precision gear and the rack, so that the safety distance of a clamped workpiece is increased, the tool retracting amount and the tool feeding amount can be freely adjusted according to workpieces of different sizes, manual operation steps are reduced, and the working efficiency is improved. And the reloading efficiency of the workpiece is improved, so that the productivity is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of centerless grinding machines, and particularly relates to a high-precision centerless grinding machine for machining valve bridges. Background Art

[0002] A centerless grinding machine is a grinding machine that does not require the workpiece to be positioned by its axis for grinding. It mainly consists of three mechanisms: a grinding wheel, a guide wheel (adjusting wheel), and a supporting bracket. Among them, the grinding wheel actually performs the grinding work, the guide wheel controls the rotation of the workpiece, and controls the feed speed and feed amount of the workpiece, while the supporting bracket is used to support the workpiece during grinding.

[0003] Since the centerless grinding machine is suitable for the machining of shaft parts, it is widely used in the manufacturing industry of automotive parts and is also the mainstream equipment for machining the rod part of the valve bridge at present. During the actual machining process of the valve bridge, after each part is machined, it is necessary to change the part. During this period, the operator needs to retract the guide wheel to leave the allowance for the machining stroke and the space for operating the part change. However, the retraction operation of the guide wheel of the existing centerless grinding machine is manual, and the efficiency is low. Especially when machining parts of the same batch with the same dimensional requirements, it requires repeated operations by the operator, which not only cannot improve the production capacity but also wastes a large amount of labor costs.

[0004] Therefore, there is a certain market demand for designing a high-precision centerless grinding machine with a higher degree of automation. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the utility model provides a high-precision centerless grinding machine for machining valve bridges to solve the above problems.

[0006] The high-precision centerless grinding machine for machining valve bridges of the utility model includes a grinding machine main body. Grinding wheels and sliding seats are respectively arranged on both sides of the top of the grinding machine main body. The sliding seats are arranged to slide horizontally on the grinding machine main body. An adjusting mechanism is arranged between the grinding machine main body and the sliding seats. A guide wheel seat that slides horizontally is arranged on the sliding seats. An automatic tool retraction mechanism is arranged between the guide wheel seat and the sliding seats. A guide wheel is arranged on the guide wheel seat. A supporting bracket is arranged between the grinding wheel and the guide wheel on the grinding machine main body.

[0007] Further, the automatic tool retraction mechanism includes a gear, a rack, and a stepping motor. A gear is arranged at the bottom of the guide wheel seat. A rack that meshes with the gear is arranged at the top of the sliding seat. A stepping motor that drives the gear to rotate is arranged on the guide wheel seat.

[0008] Further, the adjusting mechanism includes a lead screw and a lead screw nut seat. A horizontal lead screw is arranged inside the grinding machine main body. A lead screw nut seat is arranged on the lead screw. The lead screw nut seat is connected to the sliding seat.

[0009] Further, a second adjusting mechanism is arranged between the grinder main body and the supporting bracket. The second adjusting mechanism includes a second lead screw and a second lead screw nut seat. A horizontal second lead screw is arranged in the grinder main body. The second lead screw is provided with the second lead screw nut seat. The bottom of the supporting bracket is connected to the second lead screw nut seat.

[0010] Further, a telescopic mechanism is arranged between the supporting bracket and the second lead screw nut seat.

[0011] Further, one ends of the first lead screw and the second lead screw both extend out of the grinder main body and are provided with hand wheels.

[0012] Further, a supplementary light is arranged on the grinder main body.

[0013] Further, a cooling device corresponding to the grinding wheel is arranged on the grinder main body.

[0014] Compared with the prior art, on the basis of the original manual adjustment of the advancing and retracting stroke, this centerless grinder controls the advancing and retracting stroke when replacing the guide wheel by installing high-precision gears and racks, which not only increases the safety distance for clamping workpieces, but also can arbitrarily adjust the retraction amount and feed amount according to workpieces of different sizes, reduces the manual operation steps, improves the replacement efficiency of workpieces, and thus improves the production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 is a partial sectional view of a part of the structure of the present invention.

[0017] In the figure: 1, grinder main body; 2, grinding wheel; 3, slide seat; 4, guide wheel seat; 5, guide wheel; 6, supporting bracket; 7, gear; 8, rack; 9, stepping motor; 10, lead screw; 11, lead screw nut seat; 12, second lead screw; 13, second lead screw nut seat; 14, telescopic mechanism; 15, hand wheel; 16, supplementary light; 17, cooling device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to better understand the present invention, the following is combined with Figures 1 to 2 to explain in detail the embodiments of the present invention.

[0019] It should be noted that the "front, rear, left, right, up, down" directions described in the text are all based on the Figure 1 "front, rear, left, right, up, down" directions in

[0020] A high-precision centerless grinding machine for machining valve bridges of the present utility model includes a grinding machine main body 1. On both sides of the top of the grinding machine main body 1, a grinding wheel 2 and a slide base 3 are respectively arranged. Among them, the grinding wheel 2 further includes a driving mechanism for driving rotation. The slide base 3 is horizontally slidably arranged on the grinding machine main body 1. An adjusting mechanism is arranged between the grinding machine main body 1 and the slide base 3. A guide wheel seat 4 that slides horizontally is arranged on the slide base 3. An automatic tool withdrawal mechanism is arranged between the guide wheel seat 4 and the slide base 3. A guide wheel 5 is arranged on the guide wheel seat 4. A supporting bracket 6 is arranged between the grinding wheel 2 and the guide wheel 5 on the grinding machine main body 1.

[0021] In the preferred technical solution of this embodiment, the automatic tool withdrawal mechanism includes a gear 7, a rack 8 and a stepping motor 9. A gear 7 is arranged at the bottom of the guide wheel seat 4. A rack 8 meshing with the gear 7 is arranged at the top of the slide base 3. A stepping motor 9 for driving the gear 7 to rotate is arranged on the guide wheel seat 4. The stepping motor 9 is used to drive the gear 7 to rotate clockwise or counterclockwise, and realize the horizontal movement of the guide wheel seat 4 on the slide base 3 through the meshing connection of the gear 7 and the rack 8. The automatic tool withdrawal mechanism is used for the automatic tool withdrawal of the guide wheel seat 4 before changing parts, and the automatic tool feeding of the guide wheel seat 4 after changing parts; among them, the tool withdrawal amount is set according to the size of the workpiece diameter. For example, when machining a workpiece with a diameter of 50 mm, the tool withdrawal amount can be set to 15 - 20 mm; while the tool feeding amount is set according to the machining allowance of the workpiece. For example, when the machining allowance is 2 mm, after adding a safety allowance of 0.5 mm on the basis of 2 mm for the tool feeding amount, it is set to 2.5 mm; when the tool feeding amount is set, the negative tool feeding amount (such as -2.5 mm) is the origin (initial position) of the guide wheel seat 4 on the slide base 3.

[0022] In the preferred technical solution of this embodiment, as Figure 1 shown in, the adjusting mechanism includes a lead screw 10 and a lead screw nut seat 11. A horizontal lead screw 10 is arranged inside the grinding machine main body 1. A lead screw nut seat 11 is arranged on the lead screw 10. The lead screw nut seat 11 is connected to the slide base 3. By rotating the lead screw 10, the lead screw nut seat 11 on the lead screw 10 moves horizontally, and during this period, the slide base 3 connected to the lead screw nut seat 11 also moves synchronously, so as to realize the horizontal adjustment of the guide wheel seat 4 and its guide wheel 5 on the slide base 3, that is, adjust the tool feeding amount and tool withdrawal amount of the guide wheel 5.

[0023] In the preferred technical solution of this embodiment, considering that when it is necessary to replace workpieces with a large diameter difference (that is, other models of workpieces with different batches and size requirements), in addition to making an adaptive adjustment to the distance between the grinding wheel 2 and the guide wheel 5, it is also necessary to synchronously make a corresponding adjustment to the horizontal position of the supporting bracket 6. As Figure 1As shown in the figure, a second adjustment mechanism is provided between the grinding machine main body 1 and the supporting bracket 6. The second adjustment mechanism includes a second lead screw 12 and a second lead screw nut seat 13. A horizontal second lead screw 12 is provided inside the grinding machine main body 1, and a second lead screw nut seat 13 is provided on the second lead screw 12. The bottom of the supporting bracket 6 is connected to the second lead screw nut seat 13. The usage method and principle of the lead screw 10 and the lead screw nut seat 11 are the same. By rotating the second lead screw 12, the lead screw nut seat 11 on the second lead screw 12 moves horizontally, and during this period, the supporting bracket 6 connected to the lead screw nut seat 11 also moves synchronously, thereby realizing the adjustment of the horizontal position of the supporting bracket 6.

[0024] In the preferred technical solution of this embodiment, a telescopic mechanism 14 is provided between the supporting bracket 6 and the second lead screw nut seat 13. The telescopic mechanism 14 is an electric telescopic rod or a hydraulic rod, so as to facilitate the control of the height position of the supporting bracket 6, and thus make adjustments according to workpieces of different diameters to ensure the grinding effect of the workpieces.

[0025] In the preferred technical solution of this embodiment, as Figure 1 As shown in the figure, one ends of the lead screw 10 and the second lead screw 12 both extend out of the grinding machine main body 1 and are provided with a handwheel 15, and a rotating handle is provided on the handwheel 15 to facilitate the rotation of the lead screw 10 or the second lead screw 12.

[0026] In the preferred technical solution of this embodiment, in order to facilitate processing in environments with insufficient light such as at night, a supplementary light 16 is provided on the grinding machine main body 1.

[0027] In the preferred technical solution of this embodiment, a cooling device 17 corresponding to the grinding wheel 2 is provided on the grinding machine main body 1. The cooling device 17 is a cutting fluid nozzle (prior art), which is used to cool the workpiece and wash away the metal chips during grinding.

[0028] The usage method and principle of the present utility model: After the workpiece to be processed is placed on the supporting bracket 6, the feed speed and feed amount of the workpiece are controlled by the adjustment mechanism. At the same time, the second adjustment mechanism controls the position of the supporting bracket 6 so that the supporting bracket 6 can be located in the middle position between the grinding wheel 2 and the guide wheel 5. During processing, the grinding wheel 2 is responsible for grinding, and the guide wheel 5 controls the rotation of the workpiece. When a workpiece is completed, the automatic tool withdrawal mechanism operates: First, the driving mechanism drives the gear 7 to rotate clockwise, so that the entire guide wheel seat 4 moves to the right to achieve tool withdrawal, leaving a gap for replacing the workpiece and for the machining allowance of the new workpiece; then the driving mechanism drives the gear 7 to rotate counterclockwise, so that the entire guide wheel seat 4 moves to the left on the slide seat 3 until it returns to the origin and waits for workpiece replacement; after the workpiece replacement is completed, the driving mechanism drives the gear 7 to rotate counterclockwise slowly, so that the guide wheel seat 4 moves to the left to complete the feed amount stroke, and finally the workpiece is completed for grinding.

[0029] All the electrical components mentioned in this article are electrically connected to the external main controller and the 220V mains power supply, and the main controller can be a conventional known device such as a computer for control purposes.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are 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 operate in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-precision centerless grinding machine for valve bridge machining, comprising a grinding machine main body (1), characterized in that: On both sides of the top of the grinding machine main body (1), a grinding wheel (2) and a sliding seat (3) are respectively arranged. The sliding seat (3) is horizontally slidably arranged on the grinding machine main body (1). An adjusting mechanism is arranged between the grinding machine main body (1) and the sliding seat (3). A guide wheel seat (4) that slides horizontally is arranged on the sliding seat (3). An automatic tool retraction mechanism is arranged between the guide wheel seat (4) and the sliding seat (3). A guide wheel (5) is arranged on the guide wheel seat (4). A supporting bracket (6) is arranged between the grinding wheel (2) and the guide wheel (5) on the grinding machine main body (1); The automatic tool retraction mechanism includes a gear (7), a rack (8), and a stepping motor (9). A gear (7) is arranged at the bottom of the guide wheel seat (4). A rack (8) that meshes with the gear (7) is arranged at the top of the sliding seat (3). A stepping motor (9) that drives the gear (7) to rotate is arranged on the guide wheel seat (4).

2. A high-precision centerless grinding machine for valve bridge machining as described in claim 1, characterized in that: The adjusting mechanism includes a lead screw (10) and a lead screw nut seat (11). A horizontal lead screw (10) is arranged inside the grinding machine main body (1). A lead screw nut seat (11) is arranged on the lead screw (10). The lead screw nut seat (11) is connected to the sliding seat (3).

3. A high-precision centerless grinding machine for machining valve bridges as described in claim 2, characterized in that: A second adjusting mechanism is arranged between the grinding machine main body (1) and the supporting bracket (6). The second adjusting mechanism includes a second lead screw (12) and a second lead screw nut seat (13). A horizontal second lead screw (12) is arranged inside the grinding machine main body (1). A second lead screw nut seat (13) is arranged on the second lead screw (12). The bottom of the supporting bracket (6) is connected to the second lead screw nut seat (13).

4. A high-precision centerless grinding machine for valve bridge machining as described in claim 3, characterized in that: A telescopic mechanism (14) is arranged between the supporting bracket (6) and the second lead screw nut seat (13).

5. A high-precision centerless grinding machine for valve bridge machining according to claim 3, characterized in that: One ends of the lead screw (10) and the second lead screw (12) both extend out of the grinding machine main body (1) and are provided with a handwheel (15).

6. A high-precision centerless grinding machine for valve bridge machining as described in claim 1, characterized in that: A supplementary light (16) is arranged on the grinding machine main body (1).

7. A high-precision centerless grinding machine for valve bridge machining as described in claim 1, characterized in that: A cooling device (17) corresponding to the grinding wheel (2) is arranged on the grinding machine main body (1).

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