CN113146312A

CN113146312A - Clamp for manufacturing automobile bumper reinforcing beam

Info

Publication number: CN113146312A
Application number: CN202110488404.XA
Authority: CN
Inventors: 王江兰; 王卫卫; 田龙; 姜晓菲; 侯本虎
Original assignee: Yantai Engineering and Technology College
Current assignee: Yantai Engineering and Technology College
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2021-07-23

Abstract

The invention belongs to the technical field of mechanical clamps, and discloses a clamp for manufacturing a reinforcing beam of an automobile bumper, which comprises a fixed plate, two passive clamps and two active clamps, wherein the two passive clamps and the two active clamps are arranged at the top of the fixed plate, the passive clamps are fixedly arranged at two ends of the fixed plate, and the active clamps are fixedly arranged in the middle of the fixed plate. According to the invention, the piston rod of the first cylinder extends upwards to prop against the bottom end of the connecting piece to vertically move upwards through the active clamp, so that the connecting piece pushes the supporting block to rotate inwards and is matched with the other supporting block rotating inwards to clamp two sides of the middle part of the reinforcing cross beam, and the tops of two ends of the reinforcing cross beam are respectively provided with the second cylinder and the pressing block to provide pressing-down and pressing.

Description

Clamp for manufacturing automobile bumper reinforcing beam

Technical Field

The invention belongs to the technical field of mechanical clamps, and particularly relates to a clamp for manufacturing a reinforcing beam of an automobile bumper.

Background

The bumper is a protective part for absorbing and reducing the impact force of a wearing part, and is generally installed at two positions of the front part and the rear part of a vehicle where collision is frequent and the impact force is large, and reinforcing cross beams are installed on the inner sides of the bumper as parts for improving the strength, which are main parts for absorbing the impact force, so the importance of the bumper is needless to say that the bumper is naturally and extremely important to process the bumper.

When processing, the existing reinforcing beam sets for more reinforcing stations to fix the clamping position for ensuring the clamping stability, but because the clamp is heavy, the size is large, the operation is inconvenient, the difficulty is brought for the processing, and the operation is troublesome, so that a small clamp needs to be designed, the clamping stability is high, and the clamp with higher flexibility ratio improves the working efficiency.

Disclosure of Invention

The invention aims to provide a clamp for manufacturing a reinforcing beam of an automobile bumper, which aims to solve the problems in the background technology.

In order to achieve the above purpose, the invention provides the following technical scheme: a clamp for manufacturing a reinforcing beam of an automobile bumper comprises a fixing plate, a passive clamp and an active clamp, the two passive clamps and the two active clamps are arranged on the top of the fixed plate, the passive clamps are fixedly arranged at the two ends of the fixed plate, the active clamps are fixedly arranged in the middle of the fixed plate, the two passive clamps clamp the end part of the reinforced beam only through two rotary clamp mechanisms respectively arranged on the two passive clamps, the active clamp clamps the middle part of the reinforcing beam only through the jacking mechanisms respectively arranged on the two active clamps, the two ends of the top of the fixed plate are also fixedly provided with slide rails which are connected with a supporting frame in a sliding way, the top fixed mounting of support frame has No. two cylinders and No. two piston rod bottom fixed mounting of cylinder has the briquetting, the briquetting is pressed at the top of strengthening the crossbeam tip.

Preferably, the passive clamp further comprises a first mounting frame, two reset rotating shafts are hinged to two sides of the top of the first mounting frame, the first rotating arm and the second rotating arm are fixedly mounted on the surfaces of the reset rotating shafts, the rubber column is fixedly mounted between the two first rotating arms, the second rotating arm of the rotating clamp mechanism can rotate along with the reset rotating shafts and can finally prop against the bottom of the reinforcing cross beam when the second rotating arm and the second rotating arm rotate along with the reset rotating shafts and clamp the rubber column matched with the other rotating clamp mechanism on two sides of the reinforcing cross beam, a torsion spring is mounted inside the reset rotating shafts, the second rotating arms of the two rotating clamp mechanisms are in a crossed state when the reinforcing cross beam is pressed down from top to bottom, and the whole rotating clamp mechanism can rotate around the reset rotating shafts by pressing the second rotating arms when the reinforcing cross beam is not pressed down from top to bottom, the rubber columns on the two sides rotate inwards, so that the reinforcing cross beam is clamped by the two rubber columns when the second rotating arm is placed flat.

Preferably, the active clamp further comprises a second mounting frame, the upper end and the lower end of the connecting piece are respectively hinged with the end part of the supporting block and the end part of the piston rod of the first cylinder, the supporting block is hinged at the top of the second mounting frame, when the piston rod of the first air cylinder extends upwards to prop against the bottom end of the connecting piece to vertically move upwards, the connecting piece pushes the supporting block to rotate inwards and clamps two sides of the reinforcing cross beam by matching with the other supporting block which rotates inwards, after the middle part of the reinforcing cross beam is clamped, can be matched with passive clamps at two ends to realize fixation, can also firmly fix the reinforcing beam by removing the extrusion of the pressing block on the tops of the two ends, the limit of the active clamp is comprehensive, the limit degree of the up-down displacement possibly occurring on the reinforcing beam at the two ends is not high, therefore, the limiting capacity of the passive clamp is compensated for by clamping the middle part through the active clamp, and the overall stable clamping of the reinforcing beam is realized.

Preferably, a selection valve is fixedly installed below one end of the fixing plate, the selection valve comprises a valve body and four exhaust mechanisms respectively installed on the valve body, and the two exhaust mechanisms in opposite positions can be communicated with two cylinders II or two cylinders I through air guide pipes.

Preferably, the selector valve is including setting up pivot, elastic mechanism, spin in the valve body inner chamber and setting up in the air inlet of valve body surface, and the air inlet passes through the air duct and links to each other with the air pump, an installation piece is installed to the bottom of pivot, installation piece movable mounting is in the bottom of valve body, the equal fixed mounting in two symmetrical sides of installation piece has elastic mechanism, elastic mechanism's tip movable mounting has the spin, but the outside rigid coupling turning handle of pivot, the operating condition that the selector valve was operated to the rotatory turning handle of staff, and conditional production line can install step motor or servo motor control pivot additional and rotate, realizes automated control.

Preferably, when the rotating shaft drives the elastic mechanism to rotate, the rolling balls can prop against the inner wall of the valve body to synchronously rotate, and when the rolling balls pass through the connecting ports of the exhaust mechanism, the air inlet and the valve body, the rolling balls can be embedded into the connecting ports and plug the connecting ports, obviously, three working modes of the selection valve exist, the first mode is to plug the two rolling balls at opposite positions through the rolling balls, two conditions can occur, one is to ventilate two cylinders II instead of ventilating two cylinders I, and the subsequent explanation shows that the exhaust condition can occur in the two cylinders I, so that the cylinders I can retract, the other is to reverse the conditions, namely, the air is introduced into the two cylinders I instead of the two cylinders II, and the cylinders II can retract, and the second mode is to ensure that no connecting port is plugged when the elastic mechanism rotates to be in a horizontal state, then No. two cylinders and a cylinder can all admit air, and the third mode is when the elasticity mechanism rotation vertical state appears, and obviously the air inlet is blocked, and then whole No. two cylinders and a cylinder can not admit air.

Preferably, the exhaust mechanism comprises a cylindrical shell, a spring, a plugging block, an ejector pin and a fixing plate are arranged in an inner cavity of the cylindrical shell, four exhaust ports are formed in the outer surface of the cylindrical shell, the two ends of the spring respectively abut against the plugging block and the cylindrical shell, the plugging block is movably sleeved in the inner cavity of the cylindrical shell, the ejector pin is fixedly connected with the inner side of the plugging block and movably sleeved in the middle of the fixing plate, the fixing plate is fixedly installed in the cylindrical shell and abuts against the plugging block, the cylindrical shell is fixedly installed on the surface of the valve body, a communicating port at the end of the cylindrical shell is connected with the air guide tube, and the other end of the air guide tube is connected with a second cylinder or a first cylinder.

Preferably, circular through-hole has all been seted up on the surface of fixed plate and shutoff piece, the shaft of shutoff piece and the laminating of the inner chamber wall of cylinder shell, when the shutoff piece contacted with the fixed plate, the shaft of shutoff piece is with the gas vent shutoff, and the circular through-hole on air current accessible fixed plate and shutoff piece surface circulates among the air discharge mechanism, if the shutoff piece shaft no longer blocks the gas vent, then its inside high-pressure gas can be through the direct discharge of gas vent.

Preferably, the end of the thimble is designed to be smooth and spherical, the end sphere of the thimble extends into the inner cavity of the valve body, when the rolling ball is embedded into a connecting port of the exhaust mechanism and the valve body, the rolling ball can prop against the thimble to retreat, and meanwhile, the blocking block retreats together, so that the exhaust port originally blocked by the blocking block can be separated from a blocked state, the inner cavity of the cylindrical shell is communicated with an external environment, high-pressure gas in the cylindrical shell and a second cylinder or a first cylinder communicated with the cylindrical shell can be exhausted along the exhaust port, and when the rolling ball is separated from the connecting port through rotation, the exhaust port is blocked again by the moving back of the blocking block due to the elastic force of the spring.

The invention has the following beneficial effects:

1. the invention uses the cooperation of the second rotating arm and the first rotating arm in the rotating clamp mechanism, when the reinforcing beam presses down the crossed second rotating arm from top to bottom, the whole rotating clamp mechanism rotates inwards, so that the rubber columns respectively positioned on the two rotating clamps can clamp the reinforcing beam in the middle to realize preliminary limit, the active clamp extends upwards through the piston rod of the first cylinder to prop against the bottom end of the connecting piece to vertically move upwards so that the connecting piece pushes the supporting piece to rotate inwards and clamps two sides of the middle part of the reinforcing beam by matching with the other supporting piece rotating inwards, the tops of two ends of the reinforcing beam are respectively provided with the second cylinder and the pressing block to press down, under the condition of ensuring that the passive clamp finishes clamping, the active clamp or the second cylinder and the pressing block can be arbitrarily selected to stably fix the reinforcing beam, and the clamp, the volume is small and exquisite, and clamping performance is stable, has brought very big convenience for processing.

2. According to the invention, the plurality of hollow grooves for installation are arranged at the top of the fixing plate, so that the positions of all parts of the fixture on the fixing plate can be flexibly adjusted, the positions can be changed according to the processing requirements, the optimal reinforcing position can be selected, and the optimal reinforcing effect can be achieved.

3. According to the invention, by designing the unique vent valve, a worker can freely and flexibly select the second cylinder, the pressing block clamping or the active clamp clamping through the selection valve, air can be fed by using one air pump, so that the actions of a plurality of groups of cylinders can be controlled, and the rear selection valve also has the functions of plugging and exhausting, so that the functionality of the selection valve is improved, and the functionality of the whole starting clamp is also improved.

Drawings

FIG. 1 is an overall schematic view of the present invention;

FIG. 2 is a right side view of the present invention;

FIG. 3 is a schematic view of a passive clamp according to the present invention;

FIG. 4 is a schematic view of the passive clamp of the present invention in an initial state;

FIG. 5 is a side view of the structure of the active clamp of the present invention;

FIG. 6 is a schematic view of the selector valve of the present invention;

FIG. 7 is a schematic view of the internal structure of the selector valve of the present invention;

FIG. 8 is a schematic view of the distribution of the spring mechanism and the ball of the present invention;

FIG. 9 is an exploded view of the venting mechanism of the present invention;

fig. 10 is a schematic cross-sectional view of the exhaust mechanism of the present invention.

In the figure: 1. a fixing plate; 2. a passive clamp; 201. a first mounting frame; 202. a first rotating arm; 203. a second rotating arm; 204. a rubber column; 205. resetting the rotating shaft; 3. an active clamp; 301. a second mounting rack; 302. a first cylinder; 303. a connecting member; 304. a support block; 4. a slide rail; 5. a support frame; 6. a second cylinder; 7. briquetting; 8. a selector valve; 801. a valve body; 802. a rotating shaft; 803. an elastic mechanism; 804. an exhaust mechanism; 8041. a cylindrical shell; 8042. an exhaust port; 8043. a spring; 8044. a plugging block; 8045. a thimble; 8046. a fixing plate; 805. an air inlet; 806. a ball.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 10, in the embodiment of the present invention, a fixture for manufacturing a bumper reinforcement beam includes a fixed plate 1, two passive fixtures 2 and two active fixtures 3, where the two passive fixtures 2 and the two active fixtures 3 are disposed on the top of the fixed plate 1, the passive fixtures 2 are fixedly mounted at two ends of the fixed plate 1, and the active fixture 3 is fixedly mounted in the middle of the fixed plate 1, the two passive fixtures 2 clamp the end of the reinforcement beam only by two rotating clamp mechanisms respectively disposed on the two passive fixtures 2, the active fixture 3 clamps the middle of the reinforcement beam only by a top support mechanism respectively disposed on the two active fixtures 3, the two ends of the top of the fixed plate 1 are further fixedly mounted with slide rails 4, the slide rails 4 are slidably connected with support frames 5, the top of the support frames 5 is fixedly mounted with a second cylinder 6, and the bottoms of piston rods of the second cylinder 6 are fixedly mounted with press blocks 7, the pressing block 7 presses on the top of the end part of the reinforcing beam.

Wherein, the passive clamp 2 also includes a first mounting frame 201, two reset rotating shafts 205 are hinged on two sides of the top of the first mounting frame 201, two first rotating arms 202 and two second rotating arms 203 are fixedly mounted on the surface of the reset rotating shafts 205, a rubber column 204 is fixedly mounted between the two first rotating arms 202, the second rotating arm 203 of the rotating clamp mechanism can rotate along with the reset rotating shafts 205 and can finally prop against the bottom of the reinforced beam when rotating to the horizontal state, the first rotating arm 202 and the rubber column 204 can also rotate along with the reset rotating shafts 205 and clamp two sides of the reinforced beam by the rubber column 204 matched with another rotating clamp mechanism, a torsion spring is mounted in the reset rotating shafts 205, the second rotating arms 203 of the two rotating clamp mechanisms are in a cross state under the initial state without external force as shown in figure four, when the reinforced beam is pressed from top to bottom, the whole rotating clamp mechanism can rotate around the reset rotating shafts 205 by pressing the second rotating arms 203, the rubber columns 204 on both sides are then rotated inward, so that when the second rotating arm 203 is laid flat, the reinforcing beam is clamped by the two rubber columns 204.

Wherein, the active clamp 3 also includes the second mounting bracket 301, the upper and lower both ends of the connecting piece 303 are hinged with the end of the supporting block 304 and the end of the piston rod of the first cylinder 302 respectively, the supporting block 304 is hinged with the top of the second mounting bracket 301, when the piston rod of the first cylinder 302 extends upwards to prop against the bottom end of the connecting piece 303 to go up vertically, the connecting piece 303 pushes the supporting block 304 to rotate inwards and cooperate with another supporting block 304 rotating inwards to clamp both sides of the reinforcing beam, after the middle part of the reinforcing beam is clamped, the fixing can be realized by cooperating with the passive clamps 2 at both ends, the reinforcing beam can be firmly fixed by removing the extrusion of the pressing block 7 to the top parts at both ends, the active clamp 3 is limited comprehensively, the limit degree of the upper and lower displacement of the reinforcing beam which may occur at both ends is not high, so the limit capacity of the passive clamp 2 is compensated by the clamping of the active clamp 3 to the middle part, the whole stable clamping of the reinforcing beam is realized.

Wherein, the selector valve 8 is fixedly arranged below one end of the fixing plate 1, the selector valve 8 comprises a valve body 801 and four exhaust mechanisms 804 respectively arranged on the valve body 801, and the two exhaust mechanisms 804 at opposite positions can be communicated with the two second cylinders 6 or the two first cylinders 302 through air ducts.

The selector valve 8 comprises a rotating shaft 802 arranged in an inner cavity of a valve body 801, an elastic mechanism 803, a rolling ball 806 and an air inlet 805 arranged on the outer surface of the valve body 801, the air inlet 805 is connected with an air pump through an air duct, an installation block is installed at the bottom of the rotating shaft 802, the installation block is movably installed at the bottom of the valve body 801, the elastic mechanism 803 is fixedly installed on two symmetrical sides of the installation block, the rolling ball 806 is movably installed at the end of the elastic mechanism 803, a rotating handle can be fixedly connected to the outer portion of the rotating shaft 802, a worker rotates the rotating handle to operate the working state of the selector valve 8, a stepping motor or a servo motor can be additionally installed on a conditional production line to control the rotating.

Wherein, when the rotation shaft 802 drives the elastic mechanism 803 to rotate, the rolling ball 806 can prop against the inner wall of the valve body 801 to rotate synchronously, and when the rolling ball 806 passes through the connecting port of the exhaust mechanism 804, the air inlet 805 and the valve body 801, the rolling ball 806 can be embedded into the connecting port and seals the connecting port, obviously, three working modes of the selector valve 8 exist, the first mode is to seal the two rolling balls 806 which are in opposite positions, two conditions can occur, one is to ventilate the two cylinders No. two air cylinders No. 6 and not to ventilate the two cylinders No. one 302, and the subsequent explanation shows that the two cylinders No. one 302 can generate exhaust condition, so the cylinder No. one 302 can retract, the other is to invert the above conditions, namely to intake air to the two cylinders No. one 302 and intake air to the two cylinders No. 6, and the cylinder No. two 6 can generate retraction, the second mode is when the elastic mechanism 803 rotates to generate horizontal state, no connecting port is blocked, so that air can be fed into both the second air cylinder 6 and the first air cylinder 302, and in the third mode, when the elastic mechanism 803 is rotated to be in a vertical state, the air inlet 805 is obviously blocked, so that the whole second air cylinder 6 and the whole first air cylinder 302 cannot be fed.

The exhaust mechanism 804 includes a cylindrical shell 8041, a spring 8043, a blocking block 8044, an ejector pin 8045 and a fixing plate 8046 are arranged in an inner cavity of the cylindrical shell 8041, four exhaust ports 8042 are formed in an outer surface of the cylindrical shell 8041, two ends of the spring 8043 respectively push against the blocking block 8044 and the cylindrical shell 8041, the blocking block 8044 is movably sleeved in the inner cavity of the cylindrical shell 8041, the ejector pin 8045 is fixedly connected with an inner side of the blocking block 8044, the ejector pin 8045 is movably sleeved in a middle portion of the fixing plate 8046, the fixing plate 8046 is fixedly installed inside the cylindrical shell 8041, the fixing plate 8046 pushes against the blocking block 8044, the cylindrical shell 8041 is fixedly installed on a surface of the valve body 801, a communicating port at an end portion of the cylindrical shell 8041 is connected with an air guide tube, and the other end of the air guide tube is connected to the second cylinder 6 or the first cylinder 302.

Circular through holes are formed in the surfaces of the fixing plate 8046 and the blocking block 8044, the column body of the blocking block 8044 is attached to the inner cavity wall of the cylindrical shell 8041, when the blocking block 8044 contacts with the fixing plate 8046, the column body of the blocking block 8044 blocks the exhaust port 8042, air flow in the exhaust mechanism 804 can flow through the circular through holes in the surfaces of the fixing plate 8046 and the blocking block 8044, and if the column body of the blocking block 8044 does not block the exhaust port 8042 any more, high-pressure air in the blocking block 8044 can be directly exhausted through the exhaust port 8042.

When the rolling ball 806 is embedded into a connection port between the exhaust mechanism 804 and the valve body 801, the rolling ball 806 can prop against the ejection pin 8045 to retreat, and meanwhile, the blocking block 8044 retreats together, so that the exhaust port 8042 originally blocked by the blocking block 8044 can be separated from a blocked state, so that the inner cavity of the cylindrical shell 8041 is communicated with an external environment, so that the cylindrical shell 8041 and the second cylinder 6 or the first cylinder 302 communicated with the cylindrical shell 8041 can be exhausted along the exhaust port 8042, and when the rolling ball 806 is separated from the connection port through rotation, the exhaust port 8042 is blocked again by the blocking block 8044 due to the elastic force of the spring 8043.

The working principle and the using process are as follows:

during installation, the reinforcing cross beam is pressed down from the second rotating arm 203 in a cross state, the second rotating arm 203 is pressed, the whole rotating clamp mechanism can be made to rotate around the reset rotating shaft 205 by pressing the second rotating arm 203, then the rubber columns 204 on two sides rotate inwards, so that when the second rotating arm 203 is laid flat, the reinforcing cross beam is clamped by the two rubber columns 204, at the moment, the supporting frame 5 needs to be moved, the supporting frame 5 slides along the sliding rail 4 to bring the second air cylinder 6 and the pressing block 7 above two ends of the reinforcing cross beam, at the moment, the middle part of the reinforcing cross beam is also positioned between the two supporting blocks 304 which are not clamped, and an air pump connected with the air inlet 805 is started;

according to the required use state, the air intake to the first cylinder 302 or the air intake to the second cylinder 6 can be freely selected, if the reinforced beam needs to be integrally clamped and is not limited by the processing position, the rotating shaft 802 is rotated to adjust the elastic mechanism 803 to be in a horizontal state, air is simultaneously fed into the second cylinder 6 and the first cylinder 302, so that the integral clamping of the reinforced beam is realized, if the edges of the two ends of the reinforcing beam are tapped and grooved, the middle part of the reinforcing beam needs to be clamped, the rolling ball 806 is adjusted to plug the connecting port communicated with the second cylinder 6, if the middle part is positioned at a processing position, only two ends are clamped, the active clamp 3 is removed, the rolling ball 806 is adjusted to plug a connecting port communicated with the first cylinder 302, only the second cylinder 6 is ventilated, the second cylinder 6 props against the press block 7 to press down, and the reinforcing cross beam is clamped and pressed;

if a beam of a certain specification needs to be machined at the clamping part of the passive clamp 2, the mounting position of the passive clamp 2 on the fixing plate 1 is changed, and the clamping positions of the passive clamp 2 at the two ends of the reinforcing beam are adjusted.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an anchor clamps are used in manufacturing of car bumper web, includes fixed plate (1), passive anchor clamps (2) and initiative anchor clamps (3), passive anchor clamps (2), initiative anchor clamps (3) all are equipped with two at the top of fixed plate (1), passive anchor clamps (2) fixed mounting just at the both ends of fixed plate (1) initiative anchor clamps (3) fixed mounting in the middle part of fixed plate (1), its characterized in that: two passive anchor clamps (2) are realized only through two rotary clamp mechanisms (202, 203, 204, 205) on locating two passive anchor clamps (2) respectively to the tip centre gripping of reinforcing beam, initiative anchor clamps (3) are realized only through the shore mechanism (302, 303, 304) of locating respectively on two initiative anchor clamps (3) to the middle part centre gripping of reinforcing beam, the both ends at fixed plate (1) top are fixed mounting still have slide rail (4), it is connected with support frame (5) to slide on slide rail (4), the piston rod bottom fixed mounting of the top fixed mounting of support frame (5) having No. two cylinders (6) and No. two cylinders (6) has briquetting (7), briquetting (7) press the top at the reinforcing beam tip.

2. The jig for manufacturing a reinforcing cross member of an automobile bumper according to claim 1, wherein: passive anchor clamps (2) still include mounting bracket (201) No. one, the both sides at mounting bracket (201) top all articulate there are two pivot (205) that reset, rotor arm (202) and No. two rotor arms (203) all have two at the fixed surface who resets pivot (205), rubber column (204) fixed mounting is between two rotor arms (202), No. two rotor arms (203) of rotary clamp mechanism can be followed pivot (205) rotation that resets and finally can withstand web beam's bottom under changeing to the horizontality, rotor arm (202) and rubber column (204) also can be followed pivot (205) rotation that resets and will cooperate the both sides of web beam are cliied to web beam's rubber column (204) of another rotary clamp mechanism.

3. The jig for manufacturing a reinforcing cross member of an automobile bumper according to claim 1, wherein: the active clamp (3) further comprises a second mounting frame (301), the upper end and the lower end of the connecting piece (303) are hinged to the end portion of the supporting block (304) and the end portion of a piston rod of the first air cylinder (302) respectively, the supporting block (304) is hinged to the top of the second mounting frame (301), when a piston rod of the first air cylinder (302) extends upwards to abut against the bottom end of the connecting piece (303) to vertically move upwards, the connecting piece (303) pushes the supporting block (304) to rotate inwards and is matched with the other supporting block (304) which rotates inwards to clamp two sides of the reinforcing cross beam.

4. The jig for manufacturing a reinforcing cross member of an automobile bumper according to claim 1, wherein: the air exhaust device is characterized in that a selection valve (8) is fixedly mounted below one end of the fixing plate (1), the selection valve (8) comprises a valve body (801) and four air exhaust mechanisms (804) respectively mounted on the valve body (801), and the two air exhaust mechanisms (804) in opposite positions can be communicated with two second air cylinders (6) or two first air cylinders (302) through air guide pipes.

5. The jig for manufacturing a reinforcing cross member of an automobile bumper according to claim 4, wherein: the selector valve (8) comprises a rotating shaft (802), an elastic mechanism (803), a rolling ball (806) and an air inlet (805) formed in the outer surface of a valve body (801), wherein the rotating shaft (802), the elastic mechanism (803) and the rolling ball (806) are arranged in an inner cavity of the valve body (801), an installation block is installed at the bottom of the rotating shaft (802), the installation block is movably installed at the bottom of the valve body (801), the elastic mechanism (803) is fixedly installed on two symmetrical sides of the installation block, and the rolling ball (806) is movably installed at the end of the elastic mechanism (803).

6. The jig for manufacturing a reinforcing cross member of an automobile bumper according to claim 5, wherein: when the rotating shaft (802) drives the elastic mechanism (803) to rotate, the rolling ball (806) can prop against the inner wall of the valve body (801) to rotate synchronously, and when the rolling ball (806) passes through the connecting port of the exhaust mechanism (804) and the air inlet (805) and the valve body (801), the rolling ball (806) can be embedded into the connecting port and plugs the connecting port.

7. The jig for manufacturing a reinforcing cross member of an automobile bumper according to claim 6, wherein: the exhaust mechanism (804) comprises a cylindrical shell (8041), a spring (8043), a blocking block (8044), an ejector pin (8045) and a fixing plate (8046) are arranged in an inner cavity of the cylindrical shell (8041), four exhaust ports (8042) are formed in the outer surface of the cylindrical shell (8041), two ends of the spring (8043) respectively abut against the blocking block (8044) and the cylindrical shell (8041), the blocking block (8044) is movably sleeved in the inner cavity of the cylindrical shell (8041), the ejector pin (8045) is fixedly connected with the inner side of the blocking block (8044), the ejector pin (8045) is movably sleeved in the middle of the fixing plate (8046), the fixing plate (8046) is fixedly installed inside the cylindrical shell (8041), the fixing plate (8046) abuts against the blocking block (8044), and the cylindrical shell (8041) is fixedly installed on the surface of the valve body (801).

8. The jig for manufacturing a reinforcing cross member of an automobile bumper according to claim 7, wherein: circular through holes are formed in the surfaces of the fixing plate (8046) and the blocking block (8044), the column body of the blocking block (8044) is attached to the inner cavity wall of the cylindrical shell (8041), and when the blocking block (8044) is in contact with the fixing plate (8046), the column body of the blocking block (8044) blocks the exhaust port (8042).

9. The jig for manufacturing a reinforcing cross member of an automobile bumper according to claim 7, wherein: the end part of the thimble (8045) is smooth and is a sphere, and the sphere at the end part of the thimble (8045) extends into the cavity of the valve body (801).