Stamping detection device with directional anti-deviation function

Abstract

The application discloses a stamping detection equipment with a directional anti-deviation function, which comprises a base, a guide frame, a lifting block, clamping assemblies and a cable. The guide frame is vertically installed on the upper surface of the base. The lifting block is vertically and slidingly installed on the guide frame. The clamping assemblies are two in number. One clamping assembly is fixedly installed on the top end of the guide frame, and the other clamping assembly is fixed to the upper surface of the lifting block. One end of the cable is connected to the vertically moving clamping assembly, the other end of the cable is connected to one electrode of a direct current power supply, and a current meter is arranged on the cable. The clamping assembly comprises a swing head, a concave block and a connecting seat. The connecting seat is fixed to the top end of the guide frame or the lifting block. The concave block is installed on the connecting seat. The swing head is rotatably installed in the recess of the concave block. The swing head rotation axis is along the horizontal direction. The swing head has a square surface at the middle position. The swing head has a clamping workpiece with a closing structure. The swing head is provided with a mechanism for resetting the swing head.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of workpiece impact compression test, in particular to a stamping detection equipment with directional anti-deviation function. BACKGROUND

[0002] In the field of materials, many properties need to be measured for selection when used, and the impact resistance and compression resistance of the material itself and the related properties of the final workpiece are also related to the shape of the workpiece. Therefore, if the workpiece is used in an important place, the impact resistance and compression resistance of the workpiece directly affect the reliability of the device assembled therefrom, and the impact resistance and compression resistance of the workpiece should be tested in advance to verify the impact resistance and compression resistance of the workpiece.

[0003] In the prior art, the workpiece is generally placed on a moving platform to generate impact, and then the workpiece is removed for visual observation and internal flaw detection, etc. to check whether the workpiece is damaged. This method is not fast enough, needs to be operated in multiple steps, and the impact or compression process cannot ensure that all the pressure is applied to the workpiece. The workpiece has different shapes and surface bevels, and the impact force is often deviated, causing the workpiece to move in the vertical direction of the applied force or even fly out to be dangerous, and the overall workpiece stamping test efficiency is low. SUMMARY

[0004] The present application aims to provide a stamping detection equipment with directional anti-deviation function to solve the problems in the background art.

[0005] In order to solve the above technical problems, the present application provides the following technical scheme:

[0006] A stamping detection equipment with directional anti-deviation function, the detection equipment includes a base, a guide frame, a lifting block, a clamping assembly, and a cable. The guide frame is vertically installed on the upper surface of the base. The lifting block is vertically slidably installed on the guide frame. There are two clamping assemblies. One clamping assembly is fixedly installed at the top end of the guide frame, and the other clamping assembly is fixed to the upper surface of the lifting block. One end of the cable is connected to the vertically moving clamping assembly, and the other end of the cable is connected to one electrode of a direct current power supply. A current meter is arranged on the cable.

[0007] Workpiece is placed on the clamping assembly at the lifting block and effectively clamped, the clamping position is conductive and the cable is connected, after clamping, both clamping assemblies are electrified through the cable, for example, connected to the positive electrode of the twenty-four-volt DC power supply, under the condition that the structure does not change, the amount of charge on the two clamping assemblies and the workpiece is stable and unchanged, the lifting block is controlled to rise and impact the workpiece, and finally falls to the initial position, during which the charge will change to a certain extent, but as long as there is no large change in the internal metallographic structure of the workpiece before and after impact, the initial charge distribution should still be the case, that is, the current meter detects the bidirectional current obtained during the process, if the workpiece is damaged during the impact process, cracks or other conditions appear on the surface or inside, the charge distribution will certainly be different after stabilizing, and the amount of charge will also be different under the same voltage, the current meter detects the current that is not mutually offset, which indicates that the impact force will cause damage to the workpiece, and the impact performance limit of the workpiece is obtained.

[0008] The clamping assembly comprises a swing head, a concave block and a connecting seat, the connecting seat is fixed to the top end of the guide frame or the lifting block, the concave block is installed on the connecting seat, the swing head is rotatably installed in the recess of the concave block, the swing head rotation axis is in the horizontal direction, the swing head has a square surface at the middle position, the swing head has a closing structure to clamp the workpiece, and a mechanism for resetting the swing head is installed in the concave block.

[0009] The workpiece is placed on the swing head, and during the stamping test, the stress on the workpiece may not be able to ensure that it is in a vertical stress state, if a vertical force is fixedly applied, the workpiece is easy to fly horizontally when the shape of the workpiece is uneven, which causes danger and also cannot complete the test, in this case, the swing head is rotated to retreat, so that the workpiece is subjected to a horizontal component force, the clamping state is maintained, and the stamping test force applied by the device to the workpiece is completely released approximately vertically, the swing of the swing head cannot be free, and a rotating reset force should be provided.

[0010] The clamping assembly further comprises a pressure matching cylinder, the pressure matching cylinder is installed in the concave block,

[0011] The swing head comprises a clamping block, a rotating shaft and a swing body, the rotating shaft passes through the clamping block, the rotating shaft is provided with the swing body at both ends, the rotating shaft is connected with the concave block through a bearing, and the swing body is rotatably installed in the pressure matching cylinder,

[0012] The swing body comprises two sector blocks arranged at the radial outer edge of the shaft, a pressure guiding hole is arranged in the sector block, one end of the pressure guiding hole extends to the outer side surface of the sector block, the other end of the pressure guiding hole extends to the radial surface of the sector block, and the two sector blocks and the pressure guiding holes thereon are centrally symmetrical about the axis line of the rotating shaft,

[0013] The pressure distribution cylinder comprises a cylinder shell, a partition plate, a swing body installed in the cylinder shell, two groups of branch holes symmetrically arranged on the side wall of the cylinder shell, and a base circle on which the swing body is not provided with a sector block.

[0014] The pressure of the fluid gradually changes from outside. In the initial state, the two pressure introduction holes are both in the middle position of the branch holes. When the swing head is forced to rotate, the rotation of the swing body changes under pressure. One of the two pressure introduction holes introduces increased pressure, and the other introduces reduced pressure. The swing body is forced to rotate as a reset force. Through the pressure reset structure, the required reset force setting can be obtained by changing the injection pressure. It is convenient to adjust the rotation constraint of different workpieces.

[0015] The detection device further comprises an air pipe connected to a pressure source provided from outside.

[0016] The gas pressure source is used to adjust the required pressure, which is supplied to the branch hole for swing reset of the swing body.

[0017] The connecting seat and the concave block are provided with a gas distribution channel, the gas distribution channel comprises a main channel and a plurality of pressure introduction channels, and the clamping assembly further comprises a flow resistance sheet,

[0018] The main channel is arranged in the connecting seat, one end of the main channel is located on the side wall of the connecting seat and connected to the air pipe, the other end of the main channel extends to the center of the connecting seat and extends out of the pressure relief channel towards the outer surface of the side of the connecting seat away from the swing head, the pressure relief channel is directly opposite to the atmosphere, the flow resistance sheet is arranged in the main channel, a plurality of matching protrusions are arranged on the flow resistance sheet along the flow direction of the main channel, the pressure introduction channels are arranged between the matching protrusions on the vertical side wall of the main channel, the pressure introduction channels are sequentially connected to the branch holes, and the sequence of the pressure introduction channels from the air pipe is the sequence of the connection to the head and tail of each group of branch holes. The one connected to the highest pressure in each group of branch holes is the head.

[0019] The high-pressure gas introduced from the air pipe advances in the main channel, each matching protrusion acts as a flow resistance structure to sequentially reduce the pressure, and finally flows out of the device at the pressure relief channel. The fluid flow formed by the matching protrusions can realize the characteristic of gradually reducing the pressure. The gradually reduced pressure is sequentially introduced into the branch hole to provide a cross pressure difference for the rotation reset of the swing body in the pressure distribution cylinder.

[0020] Each pressure introduction channel is provided with a buffer zone on its connection path, and the volume of the buffer zone is greater than one quarter of the volume in the pressure distribution cylinder.

[0021] The buffer area can accumulate a large amount of gas in advance, and maintain the pressure gradient established in sequence on the main channel. When the swing body moves in the pressure adjusting cylinder to change the connection pressure between the two pressure areas, the gas in the buffer area can be quickly released into the cylinder shell without waiting for the gas in the main channel to be replenished.

[0022] The end of the baffle in contact with the swing body is provided with a lip, and the lip has elasticity. The lip elastically contacts the outer surface of the base circle of the swing body, and the area surrounded between the baffle and the radial side surface of the swing body where the pressure hole outlet is arranged is filled with pressure gas. The lip is pressed to be in closer contact with the base circle of the swing body, thereby preventing leakage to the other side of the baffle and achieving the swing reset of the swing body.

[0023] The end of the cable is provided with a contact head, the contact head is in sliding contact with the vertical side wall of the swing head, and the contact head is conductive.

[0024] The swing head needs to be slightly swung during detection to adapt to the shape of the workpiece. The contact head is in sliding contact with the swing head to maintain electrical connection. The cable can maintain good electrical conductivity with the clamping assembly. The charge distribution during the stamping process is detected to fully reflect whether the internal metallographic structure of the workpiece changes and whether internal cracks are generated due to impact.

[0025] An outer cover is arranged on the base, and the outer cover surrounds the guide frame, the lifting block and the clamping assembly.

[0026] Except for the base and the gas pipe and cable that need to be connected externally, the rest of the device is wrapped by the outer cover to prevent the workpiece from cracking and flying out during the detection process, which may cause danger to the surrounding environment.

[0027] Compared with the prior art, the present application has the following beneficial effects: by imparting electric charge to the workpiece before and after testing, under the same potential, the charge distribution does not change when the shape and internal metallographic structure of the workpiece do not change. When the workpiece is damaged by the stamping force, the number of attached charges before and after stamping changes, which produces an unbalanced current on the cable. The stamping force is realized by imparting vertical speed to the workpiece through the lifting block. The clamping assembly has a swing degree of freedom along the horizontal axis. When the workpiece is impacted and pressed, the swing head can be forced to retreat to fully apply a force perpendicular to the surface of the workpiece, prevent the workpiece from flying out due to a large horizontal component of the force, and cause danger and interruption of the test. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0029] Figure 1 is a front view of the overall structure of the present application;

[0030] Figure 2 is a structural schematic view at the clamping assembly of the present application;

[0031] Figure 3 is Figure 2 is a view A-A in the state of initial alignment of the swing head;

[0032] Figure 4 is Figure 2 is a view A-A in another state of the swing head;

[0033] Figure 5 is Figure 3 is a view C in the present application;

[0034] Figure 6 is Figure 2 is a view B-B in the present application;

[0035] In the figure: 1, base; 2, guide frame; 3, lifting block; 4, clamping assembly; 41, swing head; 411, clamping block; 412, rotating shaft; 413, swing body; 4131, sector block; 4132, pressure guiding hole; 42, concave block; 43, connecting seat; 44, gas distribution channel; 441, main channel; 442, pressure guiding passage; 443, pressure releasing passage; 45, flow resistance sheet; 451, apposition convex; 46, pressure distribution cylinder; 461, cylinder shell; 4611, shunt hole; 462, partition plate; 4621, lip; 51, cable; 52, contact head; 6, air pipe; 9, workpiece. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] A stamping detection device with a directional anti-deviation function, the detection device comprising a base 1, a guide frame 2, a lifting block 3, a clamping assembly 4, and a cable 51, the guide frame 2 being vertically installed on the upper surface of the base 1, the lifting block 3 being vertically and slidingly installed on the guide frame 2, the clamping assembly 4 being two, one clamping assembly 4 being fixedly installed at the top end of the guide frame 2, and the other clamping assembly 4 being fixed to the upper surface of the lifting block 3, one end of the cable 51 being connected to the vertically moving clamping assembly 4, the other end of the cable 51 being connected to an electrode of a direct current power supply, and a current meter being arranged on the cable 51.

[0038] As Figure 1As shown, workpiece 9 is placed on clamping component 4 at lifting block 3 and effectively clamped. The clamping position is conductive and connected to cable 51. After clamping, both clamping components 4 are energized through cable 51, for example, both are connected to the positive terminal of a 24-volt DC power supply. Under the condition that the structure remains unchanged, the amount of charge on the two clamping components 4 and workpiece 9 is stable and constant. The lifting block 3 is controlled to rise and impact workpiece 9, and finally falls back to the initial position. During the process, the charge will change to some extent, but as long as the internal metallographic structure of workpiece 9 does not change significantly before and after the impact, it should still be the initial charge distribution. That is, the current detected by the ammeter during the process should be a bidirectional current with positive and negative phases canceling each other out. If workpiece 9 is damaged during the impact process, such as cracks appearing on its surface or inside, the charge distribution will inevitably be different after stabilization. Under the same voltage, the amount of charge will also be different. If the ammeter detects a current that does not cancel each other out, it means that the impact force will cause damage to workpiece 9, thus obtaining the impact performance limit of workpiece 9.

[0039] The clamping assembly 4 includes a swing head 41, a concave block 42, and a connecting seat 43. The connecting seat 43 is fixed to the top of the guide frame 2 or the lifting block 3. The concave block 42 is installed on the connecting seat 43. The swing head 41 is rotatably installed in the recess of the concave block 42. The axis of rotation of the swing head 41 is horizontal. The middle position of the swing head 41 has a square surface. The swing head 41 has a mating structure to clamp the workpiece 9. A mechanism for resetting the swing head 41 is installed in the concave block 42.

[0040] like Figure 2 As shown, when workpiece 9 is placed on swing head 41, the force on workpiece 9 during the stamping test may not be guaranteed to be vertical. If a vertical force is applied, workpiece 9 may fly out horizontally if its shape is irregular, causing danger and making it impossible to complete the test. In this case, swing head 41 rotates and retracts, allowing workpiece 9 to then be subjected to a horizontal component force, maintaining the clamping state and releasing all the stamping test force applied to workpiece 9 by the device approximately vertically. The swing head 41 cannot swing freely; it should be constrained and provided with a rotational reset force.

[0041] The clamping assembly 4 also includes a pressure-regulating cylinder 46, which is installed inside the concave block 42.

[0042] The swing head 41 includes a clamping block 411, a rotating shaft 412, and a return swing body 413. The rotating shaft 412 connects the clamping block 411, and return swing bodies 413 are respectively provided at both ends of the rotating shaft 412. The rotating shaft 412 is connected to the concave block 42 through bearings. The return swing body 413 is rotatably installed in the pressure distribution cylinder 46.

[0043] The pendulum body 413 includes two sector-shaped blocks 4131 disposed on the outer radial edge of the shaft. Each sector-shaped block 4131 has a pressure-guiding hole 4132. One end of the pressure-guiding hole 4132 extends to the outer side of the sector-shaped block 4131, and the other end extends to the radial surface of the sector-shaped block 4131. The two sector-shaped blocks 4131 and their pressure-guiding holes 4132 are symmetrical about the axis of rotation 412.

[0044] The pressure distribution cylinder 46 includes a shell 461 and a baffle 462. A pendulum body 413 is installed inside the shell 461. Two sets of symmetrically distributed flow holes 4611 are opened on the side wall of the shell 461. The symmetry plane of the two sets of flow holes 4611 is a plane that passes through the axis of the rotating shaft 412. Multiple holes in each set of flow holes 4611 are connected to fluids with sequentially changing pressures. The baffle 462 is set on the inner wall of the shell 461. The other end of the baffle 462 abuts against the base circle of the pendulum body 413 where the sector block 4131 is not set.

[0045] like Figure 3 , 4 As shown, the pressure P1 to P7 gradually changes from external drainage, with P1 being the largest and P7 the smallest. In the initial state, the pressure-introducing holes 4132 on both sector blocks 4131 are aligned with the hole at the middle position of the branch hole 4611, i.e., the hole for pressure P4. When the pendulum head 41 is forced to rotate, the rotational pressure state of the pendulum body 413 changes, with one of the two pressure-introducing holes 4132 introducing an increased pressure and the other introducing a decreased pressure. Figure 4 The state of the pendulum body is forced to rotate as a reset force. Through the pressure-type reset structure, the required reset force setting can be obtained by changing the injected pressure, which makes it convenient to adjust the rotation constraint of different workpieces 9.

[0046] The detection device also includes an air pipe 6, which is connected to an externally supplied pressurized air source and is connected to the connector 43.

[0047] A gas pressure source is used to adjust the required pressure and supply it to the branch hole 4611 to reset the pendulum body 413.

[0048] A gas distribution channel 44 is provided within the connecting seat 43 and the concave block 42. The gas distribution channel 44 includes a main channel 441 and several pressure-guiding channels 442. The clamping assembly 4 also includes a flow resistance plate 45.

[0049] The main channel 441 is arranged in the connecting seat 43, one end of the main channel 441 is located at the sidewall of the connecting seat 43 and connected to the air pipe 6, the other end of the main channel 441 extends to the center of the connecting seat 43 and extends out of the outer surface of the connecting seat 43 away from the swing head 41 to form a pressure relief channel 443, the pressure relief channel 443 is directly opposite to the atmosphere, the flow resistance piece 45 is arranged in the main channel 441, a plurality of pairs of matching protrusions 461 are arranged on the flow resistance piece 45 along the flow direction of the main channel 441, a pressure guide channel 442 is arranged between each pair of matching protrusions 451 on the vertical sidewall of the main channel 441, and the pressure guide channels 442 are sequentially connected to the branch holes 4611. The sequence of the pressure guide channels 442 from the air pipe 6 is the sequence of the connection of the pressure guide channels 442 to the head and tail of each group of branch holes 4611, and the branch hole 4611 connected to the highest pressure in each group is the head.

[0050] As shown in Figure 2 、 6 , the high-pressure gas introduced from the air pipe 6 advances in the main channel 441, each matching protrusion 451 acts as a flow resistance structure to sequentially reduce the pressure, and finally flows out of the device at the pressure relief channel 443, forming a fluid flow. The matching protrusions 451 can only achieve the characteristics of step-by-step pressure reduction. The step-by-step pressure reduction gas is sequentially introduced into the branch holes 4611 to provide a cross pressure difference for the swing body 413 to rotate and reset in the pressure distribution cylinder 46.

[0051] Each pressure guide channel 442 is provided with a buffer zone on its connection path, and the volume of the buffer zone is greater than one-fourth of the volume in the pressure distribution cylinder 46.

[0052] The buffer zone can accumulate a large amount of gas in advance and maintain the pressure gradient sequentially established in the main channel 441. When the swing body 413 moves in the pressure distribution cylinder 46 and changes the connected pressure of the two pressure areas, the gas in the buffer zone can be quickly released into the cylinder shell 461 without waiting for the gas in the main channel 441 to be supplemented.

[0053] The end of the partition plate 462 abutting against the swing body 413 is provided with a lip 4621, and the lip 4621 has elasticity. As shown in Figure 3 、 5 , the lip 4621 elastically abuts against the outer surface of the base circle of the swing body 413, and the area surrounded between the partition plate 462 and the radial side surface of the swing body 413 where the pressure guide hole 4132 outlet is arranged is filled with pressure gas. The lip 4621 is pressed to abut more closely against the base circle of the swing body 413, preventing leakage to the other side of the partition plate 462 and failing to achieve the swing reset of the swing body 413.

[0054] The end of the cable 51 is provided with an abutting head 52, the abutting head 52 is in sliding contact with the vertical sidewall of the swing head 41, and the abutting head 52 is conductive.

[0055] As shown in Figure 1 、 2As shown, the head 41 needs to swing slightly during the detection process to adapt to the shape of the workpiece 9, the head 41 is in sliding contact with the head 41 to maintain electrical connection, the cable 51 can maintain good electrical conductivity with the clamping assembly 4, and the detection of the charge distribution during the stamping process can fully reflect whether the internal metallographic structure of the workpiece 9 changes and whether internal cracks are generated due to the impact.

[0056] The base 1 is provided with a cover, and the cover surrounds the guide frame 2, the lifting block 3 and the clamping assembly 4.

[0057] The device is wrapped by the cover except the base 1 and the air pipe 6 and the cable 51 which need to be connected externally, so as to prevent the workpiece 9 from cracking and flying out during the detection process and causing danger to the surrounding.

[0058] It should be noted that the relational terms herein such as first and second, and the like, are used only to differentiate one entity or action from another, and do not necessarily require or imply that these entities or actions occur in any such actual relationship or order. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or device.

[0059] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and does not limit the present application, although the above-mentioned embodiments of the present application are described in detail, those skilled in the art can still modify the technical solutions recorded in the above-mentioned embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A punch detection apparatus having a directional anti-skew function, characterized by: The detection equipment includes a base (1), a guide frame (2), a lifting block (3), a clamping assembly (4), and a cable (51). The guide frame (2) is vertically installed on the upper surface of the base (1). The lifting block (3) is vertically and slidingly installed on the guide frame (2). The clamping assembly (4) has two clamping assemblies (4). One clamping assembly (4) is fixedly installed on the top end of the guide frame (2). The other clamping assembly (4) is fixedly installed on the upper surface of the lifting block (3). One end of the cable (51) is connected to the vertically moving clamping assembly (4). The other end of the cable (51) is connected to one electrode of a direct current power supply. A current meter is arranged on the cable (51). The clamping assembly (4) includes a swing head (41), a concave block (42), and a connecting seat (43). The connecting seat (43) is fixed to the top end of the guide frame (2) or the upper surface of the lifting block (3). The concave block (42) is installed on the connecting seat (43). The swing head (41) is rotatably installed in the recess of the concave block (42). The rotation axis of the swing head (41) is in the horizontal direction. The swing head (41) has a four-square surface at the middle position. The swing head (41) has a hinged structure for clamping a workpiece (9). A mechanism for resetting the swing head (41) is installed in the concave block (42).

2. The punch detection apparatus having a directional anti-skew function according to claim 1, characterized in that: The clamping assembly (4) further includes a pressure matching cylinder (46) installed inside the concave block (42). The swing head (41) includes a clamping block (411), a rotating shaft (412), and a swing body (413). The rotating shaft (412) passes through the clamping block (411). The swing body (413) is arranged at both ends of the rotating shaft (412). The rotating shaft (412) is connected to the concave block (42) through a bearing. The swing body (413) is rotatably installed in the pressure matching cylinder (46). The swing body (413) includes two sector blocks (4131) arranged on the radial outer edge of the shaft. A pressure guiding hole (4132) is arranged in the sector block (4131). One end of the pressure guiding hole (4132) extends to the outer side surface of the sector block (4131). The other end of the pressure guiding hole (4132) extends to the radial surface of the sector block (4131). The two sector blocks (4131) and the pressure guiding holes (4132) thereon are centrally symmetric around the axis of the rotating shaft (412). The pressure matching cylinder (46) includes a cylinder shell (461) and a partition plate (462). The swing body (413) is installed in the cylinder shell (461). Two groups of branch holes (4611) are symmetrically arranged on the side wall of the cylinder shell (461). The symmetry plane of the two groups of branch holes (4611) is a plane passing through the axis of the rotating shaft (412). The branch holes (4611) in each group are sequentially connected to fluids with sequentially changing pressures. The partition plate (462) is arranged on the inner wall of the cylinder shell (461). The other end of the partition plate (462) abuts against the base circle of the swing body (413) without the sector block (4131).

3. The punch detection apparatus having a directional anti-skew function according to claim 2, characterized in that: The detection equipment further includes an air pipe (6) connected to an externally provided pressure source. The air pipe (6) is connected to the connecting seat (43).

4. The punch detection apparatus having a directional anti-skew function according to claim 3, characterized in that: The connecting seat (43) and the concave block (42) are provided with a gas distribution channel (44), the gas distribution channel (44) comprises a main channel (441) and a plurality of pressure introduction channels (442), the clamping assembly (4) further comprises a flow resistance sheet (45), The main channel (441) is arranged in the connecting seat (43), one end of the main channel (441) is located at the side wall of the connecting seat (43) and connected with the air pipe (6), the other end of the main channel (441) extends to the center of the connecting seat (43) and extends out a pressure relief channel (443) from the outer surface of the side of the connecting seat (43) away from the swing head (41), the pressure relief channel (443) is directly opposite to the atmosphere, the flow resistance sheet (45) is arranged in the main channel (441), a plurality of pairs of combined protrusions (451) are arranged on the flow resistance sheet (45) along the flow direction of the main channel (441), the vertical side wall of the main channel (441) is provided with a pressure introduction channel (442) between each pair of combined protrusions (451), the pressure introduction channels (442) are sequentially connected to the branch holes (4611), the sequence of the pressure introduction channels (442) from the air pipe (6) is the sequence of the connection to the head and tail of each group of branch holes (4611), and the branch hole (4611) connected with the highest pressure is the head.

5. The punch detection apparatus having a directional anti-skew function according to claim 4, characterized in that: Each of the pressure introduction channels (442) is provided with a buffer zone on the connection path, and the volume of the buffer zone is greater than one fourth of the volume in the pressure distribution cylinder (46).

6. The punch detection apparatus having a directional anti-skew function according to claim 2, characterized in that: The end of the baffle (462) abutting against the swing body (413) is provided with a lip (4621), and the lip (4621) has elasticity.

7. The punch detection apparatus having a directional anti-skew function according to claim 1, characterized in that: The end of the cable (51) is provided with an abutting head (52), the abutting head (52) is in sliding contact with the vertical side wall of the swing head (41), and the abutting head (52) is conductive.

8. The punch detection apparatus having a directional anti-skew function according to claim 1, characterized in that: The base (1) is provided with an outer cover, and the outer cover surrounds the guide frame (2), the lifting block (3) and the clamping assembly (4).

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