Compact positioning and clamping mechanism

Abstract

The utility model belongs to the technical field of automobile parts processing, and relates to a compact positioning and clamping mechanism, which comprises a tensioning device shell, a piston rod, a wedge block base, a first wedge block, a second wedge block and a limiting block, a through stepped through hole is formed in the inside axis direction of the tensioning device shell, the piston rod is arranged in the stepped through hole and can slide, the wedge block base is arranged on the top of the piston rod, limiting round holes are formed in the left and right sides of the tensioning device shell, the limiting round holes are communicated with the stepped through hole, and the first wedge block and the second wedge block are arranged in the two limiting round holes respectively. When the utility model is used, the piston rod is pushed to slide by hydraulic oil, the wedge block base moves upwards along with the piston rod, the first wedge block and the second wedge block slide outwards along the taper surface of the wedge block base at this time, the pin insertion positioning of positioning holes with different sizes is realized, the deviation caused by the positioning gap is avoided, the positioning precision is ensured, and the situation that the tightness of positioning is not the same is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts processing technology, specifically, it relates to a precision positioning structure on a high-precision fixture with two pins and one surface, and in particular a compact positioning and clamping mechanism. Background Technology

[0002] In the automotive manufacturing industry, high-precision fixtures are a crucial factor in producing products that meet customer drawing requirements. Therefore, obtaining high-precision fixtures inevitably places higher demands on fixture positioning devices. Currently, automotive parts processing typically employs a two-pin positioning method. The two pins are generally fixed round pins or fixed diamond pins. However, this type of positioning structure has the following unavoidable problems in practical applications:

[0003] 1. The diameter of the round pin is generally smaller than the diameter of the positioning hole, resulting in a positioning gap and inaccurate positioning; for high-precision product processing, it is difficult to meet product requirements.

[0004] 2. The positioning gap is too small, making product clamping inconvenient; if operators are not careful, the product may be misaligned or damaged, resulting in product scrap.

[0005] 3. For larger hole diameters, the diameter of the locating pin will also increase, which will inevitably consume more material and increase costs.

[0006] 4. For aluminum casting blanks with large deviations, the clamping will result in uneven tightness, making it impossible to accurately position the workpiece.

[0007] 5. The positioning product is singular and cannot be reused; one type of fixed round pin can only be used to position products with one size hole diameter. Utility Model Content

[0008] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a compact positioning and clamping mechanism.

[0009] According to the present invention, a compact positioning and clamping mechanism includes a tensioning device housing, a piston rod, a wedge block base, a first wedge block, a second wedge block, and a limiting block. The tensioning device housing has a through-hole along its axial direction. A slidable piston rod is disposed within the through-hole. The wedge block base is mounted on the top of the piston rod. Limiting holes are provided on both the left and right sides of the tensioning device housing, communicating with the through-hole. The first and second wedge blocks are respectively disposed within the two limiting holes, and both the first and second wedge blocks are in contact with the conical surface of the wedge block base. A limiting block is fitted onto the bottom of the piston rod, and the limiting block is disposed within the through-hole.

[0010] In a preferred embodiment: mounting ears are provided on the bottom left and right sides of the tensioning device housing, making the tensioning device housing T-shaped, and a plurality of positioning device locking screws are provided on the mounting ears.

[0011] In a preferred embodiment: an oil inlet chamber is provided on the bottom left side of the tensioning device housing, and the oil inlet chamber is connected to a stepped through hole; an oil inlet is provided at the bottom of the mounting ear on the left side of the tensioning device housing, and the oil inlet is connected to the oil inlet chamber; an oil outlet chamber is provided on the bottom right side of the tensioning device housing, and the oil outlet chamber is connected to a stepped through hole; the connection between the oil outlet chamber and the stepped through hole is higher than the connection between the oil inlet and the oil inlet chamber; an oil outlet is provided at the bottom of the mounting ear on the right side of the tensioning device housing, and the oil outlet is connected to the oil outlet chamber.

[0012] In a preferred embodiment: oil port sealing rings are installed at both the oil inlet port and the oil outlet port.

[0013] In a preferred embodiment: an annular first sealing groove is formed in the middle of the stepped through hole, and a housing sealing ring is provided in the first sealing groove.

[0014] In a preferred embodiment: a top cover is provided on the top of the tensioning device housing, and the top cover is fixed to the tensioning device housing by means of a plurality of top cover locking screws. The top cover is used to limit the sliding of the piston rod in the stepped through hole.

[0015] In a preferred embodiment: the piston rod is a stepped shaft, and an annular second sealing groove is provided in the middle of the stepped section of the piston rod, and a piston rod sealing ring is provided in the second sealing groove.

[0016] In a preferred embodiment: the top of the piston rod is threaded, and the top thread of the piston rod engages with the threaded hole of the wedge block base.

[0017] In a preferred embodiment: tapered slides are provided on the left and right sides of the wedge block base, and guide grooves are opened on the side end faces of the wedge block base. The first wedge block and the second wedge block have a tapered surface at one end near the wedge block base. Guide grooves are opened on the tapered surfaces of the first wedge block and the second wedge block. The first wedge block and the second wedge block are embedded into the guide grooves of the wedge block base through the guide grooves. The tapered surfaces of the first wedge block and the second wedge block are both in contact with the tapered surfaces of the wedge block base.

[0018] In a preferred embodiment: a third sealing groove is formed in the middle of the side end of the limiting block, and a sealing ring of the limiting block is provided in the third sealing groove.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In use, this invention uses hydraulic oil to push the piston rod to slide, and the wedge block base moves upward with the piston rod. At this time, the first wedge block and the second wedge block slide outward along the conical surface of the wedge block base until they make close contact with the processed product. This achieves pin insertion positioning of positioning holes of different sizes, avoids deviations caused by positioning gaps, ensures the accuracy of the limit, and reduces the situation of inconsistent positioning tightness. The limit pressure is controlled by hydraulic adjustment of hydraulic oil to prevent damage to the product. It can handle processed products with different positioning and allows for reuse of the device, reducing cost consumption. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a cross-sectional view of the present invention;

[0023] Figure 2 This is a three-dimensional view of the present invention;

[0024] Detailed Implementation

[0025] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0026] like Figure 1 and Figure 2 As shown, this utility model discloses a compact positioning and clamping mechanism, including a tensioning device housing 4, a piston rod 9, a wedge-shaped block base 7, a first wedge-shaped block 5, a second wedge-shaped block 8, and a limiting block 12. The tensioning device housing 4 has a through stepped hole along its axial direction. A slidable piston rod 9 is installed in the stepped hole. The wedge-shaped block base 7 is installed on the top of the piston rod 9. Limiting holes are opened on both the left and right sides of the tensioning device housing 4, and the limiting holes communicate with the stepped hole. The first wedge-shaped block 5 and the second wedge-shaped block 8 are respectively installed in the two limiting holes. The first wedge-shaped block 5 and the second wedge-shaped block 8 are both in contact with the conical surface of the wedge-shaped block base 7. The limiting block 12 is sleeved on the bottom of the piston rod 9 and is installed in the stepped hole to provide a base support for the piston rod 9.

[0027] The tensioning device housing 4 has mounting ears on its bottom left and right sides, making it T-shaped. Several positioning locking screws 14 are provided on the mounting ears to fix the device to the mounting base and prevent displacement during positioning. An oil inlet chamber 3 is opened on the bottom left side of the tensioning device housing 4, communicating with a stepped through hole. An oil inlet is opened at the bottom of the left mounting ear of the tensioning device housing 4, communicating with the oil inlet chamber 3. An oil outlet chamber 13 is opened on the bottom right side of the tensioning device housing 4, communicating with a stepped through hole. The opening of the oil outlet chamber 13 communicating with the stepped through hole is higher than... The oil inlet is connected to the oil inlet chamber 3. An oil outlet is opened at the bottom of the mounting ear on the right side of the tensioning device housing 4. The oil outlet is connected to the oil outlet chamber 13. Oil port sealing rings 2 are installed at both the port of the oil inlet and the port of the oil outlet. The oil port sealing rings 2 can provide a good sealing effect during the connection with the oil supply system. An annular first sealing groove is opened in the middle of the stepped through hole. A housing sealing ring 10 is set in the first sealing groove. A top cover 6 is set on the top of the tensioning device housing 4. The top cover 6 is fixed to the tensioning device housing 4 by multiple top cover locking screws 15. The top cover 6 is used to limit the sliding of the piston rod 9 in the stepped through hole.

[0028] The piston rod 9 is a stepped shaft. An annular second sealing groove is provided in the middle of the stepped section of the piston rod 9. A piston rod sealing ring 11 is provided in the second sealing groove. During the sliding process of the piston rod 9 in the stepped through hole, the hydraulic oil can be effectively contained in the cavity through the piston rod sealing ring 11 and the outer shell sealing ring 10, preventing oil leakage and reducing oil pressure. The top of the piston rod 9 is threaded, and the top thread of the piston rod 9 cooperates with the threaded hole of the wedge block base 7.

[0029] Tapered slides are provided on the left and right sides of the wedge base 7. Guide grooves are opened on the side end faces of the wedge base 7. The first wedge 5 and the second wedge 8 have a tapered surface near the wedge base 7. Guide grooves are opened on the tapered surfaces of the first wedge 5 and the second wedge 8. The first wedge 5 and the second wedge 8 are embedded into the guide grooves of the wedge base 7 through the guide grooves, so that the tapered surfaces of the first wedge 5 and the second wedge 8 are in contact with the tapered surfaces of the wedge base 7.

[0030] A third sealing groove is provided in the middle of the side end of the limiting block 12, and a limiting block sealing ring 1 is provided in the third sealing groove. The limiting block sealing ring 1 is used to enhance the connection and sealing between the limiting block 12 and the tensioning device housing 4.

[0031] Working principle

[0032] In use, this invention connects to the oil inlet via an external oil supply line, allowing oil to be delivered through the oil inlet chamber 3 into the annular cavity between the limiting block 12 and the piston rod 9. The oil pressure lifts the piston rod 9, causing the wedge-shaped block base 7 to move upwards along with the piston rod 9. At this time, the first wedge 5 and the second wedge 8 slide outwards along the conical surface of the wedge-shaped block base 7 until they make close contact with the processed product. This achieves pin-insertion positioning of positioning holes of different sizes, avoiding deviations caused by positioning gaps, ensuring the accuracy of the limit, and reducing inconsistent positioning tightness. The limit pressure is controlled by hydraulically adjusting the hydraulic oil to prevent damage to the product. This invention can handle processed products with different positioning and allows for repeated use of the device, reducing cost consumption.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A compact positioning and clamping mechanism, characterized in that, The device includes a tensioning device housing (4), a piston rod (9), a wedge block base (7), a first wedge block (5), a second wedge block (8), and a limiting block (12). The tensioning device housing (4) has a through stepped hole in the axial direction inside. A slidable piston rod (9) is installed in the stepped hole. The top of the piston rod (9) is fitted with the wedge block base (7). Limiting holes are opened on both the left and right sides of the tensioning device housing (4). The limiting holes are connected to the stepped hole. The first wedge block (5) and the second wedge block (8) are respectively installed in the two limiting holes. The first wedge block (5) and the second wedge block (8) are both in contact with the conical surface of the wedge block base (7). The bottom of the piston rod (9) is fitted with a limiting block (12). The limiting block (12) is installed in the stepped hole.

2. The compact positioning and clamping mechanism according to claim 1, characterized in that, The tensioning device housing (4) has mounting ears on the bottom left and right sides, making the tensioning device housing (4) T-shaped, and a number of positioning device locking screws (14) are provided on the mounting ears.

3. The compact positioning and clamping mechanism according to claim 1, characterized in that, The bottom left side of the tensioning device housing (4) has an oil inlet chamber (3) connected to a stepped through hole. The bottom of the left mounting ear of the tensioning device housing (4) has an oil inlet port connected to the oil inlet chamber (3). The bottom right side of the tensioning device housing (4) has an oil outlet chamber (13) connected to the stepped through hole. The connection between the oil outlet chamber (13) and the stepped through hole is higher than the connection between the oil inlet port and the oil inlet chamber (3). The bottom of the right mounting ear of the tensioning device housing (4) has an oil outlet port connected to the oil outlet chamber (13).

4. The compact positioning and clamping mechanism according to claim 3, characterized in that, Oil port sealing rings (2) are installed at both the oil inlet and the oil outlet.

5. The compact positioning and clamping mechanism according to claim 3, characterized in that, The stepped through hole has an annular first sealing groove in the middle of the step, and a shell sealing ring (10) is provided in the first sealing groove.

6. The compact positioning and clamping mechanism according to claim 3, characterized in that, The top of the tensioning device housing (4) is provided with a top cover (6), which is fixed to the tensioning device housing (4) by means of multiple top cover locking screws (15). The top cover (6) is used to limit the sliding of the piston rod (9) in the stepped through hole.

7. The compact positioning and clamping mechanism according to claim 1, characterized in that, The piston rod (9) is a stepped shaft, and an annular second sealing groove is provided in the middle of the stepped shaft of the piston rod (9). A piston rod sealing ring (11) is provided in the second sealing groove.

8. The compact positioning and clamping mechanism according to claim 7, characterized in that, The piston rod (9) has a thread at the top, and the thread at the top of the piston rod (9) is engaged with the threaded hole of the wedge block base (7).

9. The compact positioning and clamping mechanism according to claim 1, characterized in that, Tapered slides are provided on the left and right sides of the wedge base (7). Guide grooves are opened on the side end faces of the wedge base (7). The first wedge (5) and the second wedge (8) have a conical surface at one end of the wedge base (7). Guide grooves are opened on the conical surfaces of the first wedge (5) and the second wedge (8). The first wedge (5) and the second wedge (8) are embedded into the guide groove of the wedge base (7) through the guide groove. The conical surface of the first wedge (5) and the second wedge (8) are both in contact with the conical surface of the wedge base (7).

10. The compact positioning and clamping mechanism according to claim 1, characterized in that, A third sealing groove is provided at the middle of the side end of the limiting block (12), and a limiting block sealing ring (1) is provided in the third sealing groove.

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