Helium detection jig for air tightness of battery cover plate

Abstract

The invention discloses a battery cover plate airtightness helium detection jig, which is characterized in that the upper part of a lower die is recessed to form a storage groove, the left end and the right side of the interior of the storage groove are respectively provided with a plurality of uniformly distributed ejection structures, a placing plate is arranged in the storage groove in an up-and-down moving manner, and the left end of the storage groove is rotatably provided with a connecting rotating shaft; the left end of the placing plate sleeves the connecting rotating shaft, the connecting rotating shaft is sleeved with an upper die, a movable die is arranged in the upper die in an up-down sliding mode, two sets of deflection grooves are formed in the connecting rotating shaft, and when the upper die is far away from or close to the lower die, the connecting rotating shaft can rotate by 90 degrees clockwise or anticlockwise; and the placing plate is arranged in the lower die in an up-and-down lifting mode through the ejection structure, the placing plate is connected with the connecting rotating shaft and can rotate by 90 degrees along with the connecting rotating shaft, when the upper die is far away from the lower die, the placing plate is located outside the position between the upper die and the lower die, and hand clamping caused by misoperation of a user when the upper die is pressed is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and in particular to a helium detection jig for air tightness of a battery cover. Background Art

[0002] Battery covers are generally produced using a stamping process, which has a simple process and a fast production cycle. The resulting power battery covers have good structural integrity and can also significantly reduce weight. After the battery covers are stamped, they also need to be tested for air tightness.

[0003] At present, the air tightness test of the battery cover is generally to place the battery cover on the lower mold, and press the upper mold on the upper part of the lower mold, and then pass gas to perform air tightness test. The upper mold and the lower mold are vertically arranged, and the upper mold is generally directly connected to the lifting mechanism. During the test, the worker places the battery cover directly on the lower mold, and then moves the upper mold down for testing. When the personnel's hand reaches under the upper mold, if the personnel is distracted or for other reasons, it is easy to cause the hand to be pinched;

[0004] Similarly, the lower mold needs to be vacuumed during the inspection process. Since the upper surface of the lower mold and the surface of the battery cover are smooth and horizontal, the workpiece will be adsorbed on the lower mold and difficult to remove when taking out the material. For this reason, we designed a battery cover airtightness helium inspection fixture. Summary of the invention

[0005] The invention provides a battery cover airtightness helium inspection jig, which solves the problem that during inspection, workers place the battery cover directly on top of the lower mold, and then move the upper mold downward for inspection. When the worker's hand is inserted under the upper mold, if the worker is distracted, the hand may be easily pinched for other reasons.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A battery cover gas tightness helium inspection jig, comprising a lower mold, a storage groove is formed on the upper part of the lower mold, a plurality of evenly distributed ejection structures are respectively arranged at the left end and the right side of the storage groove, a placement plate is arranged in the storage groove for vertical movement, the top of the ejection structure is connected to the placement plate in an upward and downward lifting manner, and a workpiece is placed on the placement plate;

[0008] The left end of the storage slot is rotatably mounted with a connecting shaft, the left end of the placement plate is sleeved on the outside of the connecting shaft, and the two are connected by sliding up and down, and a disengagement mechanism is also provided on the left side of the placement plate, and the disengagement mechanism is connected by sliding up and down with the connecting shaft;

[0009] The outer part of the connecting shaft is sleeved with an upper mold, and the two are arranged to slide up and down. A movable mold is arranged inside the upper mold to slide up and down.

[0010] Further, a mounting cavity is provided on the upper end surface of the upper mold, an air cavity is provided at the bottom of the upper mold, and the mounting cavity is communicated with the air cavity, an upper cover plate is screwed on the upper part of the mounting cavity, two groups of guide rods are provided at the bottom end of the upper cover plate, each group of guide rods includes two guide rods, each guide rod is sleeved with a compression spring, and the bottom end of the compression spring abuts against the movable mold;

[0011] The movable mold slides up and down and is placed in the installation cavity. The lower end of the movable mold is also provided with an extrusion portion, which extends into the air cavity. After the upper mold is in contact and pressed with the lower mold, the workpiece is placed inside the air cavity. At this time, the movable mold will press the workpiece tightly against the upper end surface of the placement plate under the action of the clamping spring, so that the two are tightly pressed together, the sealing is improved, and the subsequent detection of the air tightness of the workpiece is convenient.

[0012] Furthermore, the rear surface of the upper mold is provided with three groups of equally spaced air inlet holes, the air inlet holes are connected to the interior of the installation cavity, and the air inlet holes are used to connect to an external pipeline, so as to facilitate helium to be filled into the closed air cavity formed between the upper mold and the lower mold, so as to facilitate subsequent detection;

[0013] The left and right sides of the lower mold are penetrated to form exhaust holes, and three connecting holes distributed at equal intervals are opened in the receiving groove. The connecting holes are connected to the exhaust holes. During use, one end of the exhaust hole is connected to the pipeline of an external negative pressure pump, and the other end is sealed. The inside of the exhaust hole is evacuated, and the air cavity is filled with helium. A helium detector is used to detect the pumped gas to determine whether the helium in the air cavity enters the exhaust hole through the workpiece, and then determine whether the workpiece is deflated.

[0014] Furthermore, a plurality of installation openings distributed in a circumferential array are provided at both left and right ends of the storage slot, and a lifting opening is provided in the installation opening;

[0015] The ejection structure includes an ejection spring placed in the lifting port, an ejection rod is slidably arranged in the installation port, the lower end of the ejection rod is placed in the lifting port, and the bottom of the ejection rod is widened to form a disc-shaped structure, the bottom end of the disc-shaped structure abuts against the top of the ejection spring, and the design of the ejection structure enables the placement plate to move up and down, and when the upper mold is away from the lower mold, the placement plate can be above the lower mold, and when the lower mold overlaps with the upper mold, the placement plate is completely placed in the storage groove.

[0016] Furthermore, a guide groove 2 and a guide groove 1 are respectively provided on the left and right sides of the lower end surface of the placement plate, and both guide grooves 1 and 2 are arc-shaped structures, and the centers of the circles of the two are collinear with the axis of the connecting shaft. The top of the ejection structure is in sliding contact with the guide groove 1 and the guide groove 2, and the multiple ejection structures on the left and right sides are distributed in a circular array, and the central axis of the array between them is collinear with the axis of the connecting shaft, so that the ejection structure can support the placement plate during its rotation.

[0017] Furthermore, a circular hole 1 is provided at the left end of the placement plate, a circular hole 2 is provided at the left end of the upper mold, a connecting shaft is inserted into the circular hole 1, a lifting groove is symmetrically provided at the lower end of the outer surface of the connecting shaft, a lifting slider is provided in the lifting groove for sliding up and down, and the lifting slider is fixed to the inner wall of the circular hole 1, and the design of the lifting slider and the lifting groove enables the placement plate to move up and down along the connecting shaft, and the two can rotate synchronously, thereby facilitating the subsequent rotation of the placement plate by ninety degrees;

[0018] Two groups of deflection grooves distributed in a circumferential array are arranged above the outer ring surface of the connecting shaft, and each group of deflection grooves includes a movable groove 1 arranged below the outer surface of the connecting shaft, and a movable groove 2 is arranged above the outer ring surface of the connecting shaft. The top of the movable groove 1 and the bottom of the movable groove 2 are connected through a deflection spiral groove. A deflection cylinder is arranged in the deflection groove for sliding up and down, and the deflection cylinder is fixed to the inner wall of the second circular hole. When the upper mold moves up and down, the deflection cylinder will first move up and down in a straight line in the movable groove 1 or the movable groove 2. When it moves into the deflection spiral groove, the connecting shaft at this time will be deflected to a certain extent, so that the placement plate can rotate synchronously. After the deflection cylinder is completely moved in the deflection spiral groove, the entire placement plate will rotate ninety degrees.

[0019] Furthermore, the arc length between the moving groove 1 and the moving groove 2 in the same group of the deflection grooves is 1 / 4 of the circumference of the entire connecting shaft, and the top of the moving groove 2 passes through the top of the connecting shaft. The two moving grooves 1 and the two moving grooves 2 are arranged in a circular array on the connecting shaft, that is, the moving groove 1 and the moving groove 2 divide the connecting shaft into four equal parts. After the deflection cylinder moves completely in the deflection spiral groove, the entire connecting shaft and the placement plate will rotate ninety degrees, and the design of the moving groove 2 also facilitates the installation and disassembly of the deflection cylinder.

[0020] Furthermore, the bottom end of the connecting shaft is hollowed out to form a cavity, and a connecting sliding hole is provided on the outer surface of the connecting shaft, and the connecting sliding hole is connected to the cavity;

[0021] A fixed shaft is fixed to the left end of the storage slot, and the fixed shaft is placed inside the cavity, and the connecting shaft is rotatably connected to the fixed shaft. An adjusting slide groove is provided below the outer surface of the fixed shaft, and the adjusting slide groove is located on the left side of the connecting slide hole. An eccentric groove is provided above the outer surface of the fixed shaft, and the eccentric groove is connected to the top of the adjusting slide groove. The design of the adjusting slide groove enables the disengagement mechanism to move up and down together with the placement plate when the placement plate moves up and down. The disengagement mechanism can also cause the disengagement rod to protrude or retract as the placement plate rotates, which is convenient for removing the workpiece. The depth of the eccentric groove gradually increases from front to back. During the process of the disengagement mechanism deflecting forward, as the depth of the deflection ring groove decreases, the disengagement mechanism will gradually protrude, thereby lifting up the left end portion of the workpiece, and there will be a reduction between the entire workpiece and the placement plate, so that the two will not be adsorbed together, which is convenient for removing the workpiece.

[0022] Furthermore, an installation cavity is provided on the inner side wall of the circular hole 1 of the placement plate, the left end of the installation cavity is connected to the outside, and a through hole is also provided on the top of the placement plate;

[0023] The disengagement mechanism comprises a moving block which is slidably arranged in the installation cavity, a telescopic rod is arranged at the left end of the moving block, the left end of the telescopic rod is placed outside the installation cavity and is in sliding contact with the eccentric groove, a return spring is abutted against the right side of the installation cavity, and the left end of the return spring abuts against the right end of the moving block, and during the rotation of the disengagement mechanism, the telescopic rod will slide along the deflection ring groove, and since the depth of the deflection ring groove gradually increases from front to back, the telescopic rod will be pushed toward the inside of the installation cavity;

[0024] The upper right side of the moving block is designed as an inclined surface, and a moving slide groove is opened on the inclined surface. The cross-section of the moving slide groove is a convex structure. A moving slider is slidably arranged in the moving slide groove. A disengagement rod is connected above the moving slider. The disengagement rod passes through the through hole and is placed above the placement plate. When the placement plate rotates forward, the moving block moves to the right, and then pushes the disengagement rod to extend upward. When it rotates backward, the moving block moves to the left, and then pushes the disengagement rod to extend upward and inward.

[0025] Furthermore, symmetrically distributed pole grooves are provided at the left and right ends of the upper surface of the placement plate, and an explosion-proof groove is provided at the center of the upper part of the placement plate. Air holes are provided at the bottom ends of the two pole grooves and the explosion-proof groove, and the air holes are connected to the connecting holes for gas circulation, thereby facilitating the detection of air tightness;

[0026] Sealing pads are provided on the outside of the pole slot and the explosion-proof slot, sealing rings are provided on the upper surface of the placement plate and the inner wall of the storage slot, positive and negative poles are integrally provided on the left and right sides below the workpiece, and an explosion-proof structure is also provided at the center, the positive pole, negative pole and explosion-proof structure are placed in the corresponding pole slot and explosion-proof slot, the size of the positive pole, negative pole and explosion-proof structure is smaller than that of the pole slot and explosion-proof slot, so they can be sealed, which is convenient for air-tightness detection, and the design of the sealing ring improves the sealing when the upper mold is pressed together.

[0027] Beneficial effects of the present invention:

[0028] 1. By setting a connecting shaft between the upper die and the lower die, and two sets of deflection grooves are set on the connecting shaft, the upper die can make the connecting shaft rotate 90 degrees clockwise or counterclockwise when it is away from or close to the lower die, and the placement plate is set in the lower die by the ejection structure, and the placement plate is connected to the connecting shaft, and can rotate 90 degrees with the connecting shaft. When the upper die is away from the lower die, the placement plate is outside the two, so that it is convenient to take the workpiece above the placement plate and place a new workpiece, so as to avoid the user's hand being pinched by mistake when the upper die is pressed together, thereby improving safety;

[0029] 2. A disengagement mechanism is provided in the placement plate, which can be pushed out or retracted when the placement plate rotates, and then can be pushed upward when the placement plate is away from the lower mold, so that the left end of the workpiece is lifted up, and there will be a gap between the entire workpiece and the placement plate, so that the two will not be adsorbed together, which is convenient for removing the workpiece, and the disengagement mechanism will be pushed up and down or retracted during the rotation of the placement plate, so that the workpiece is always on the placement plate and will not fall off due to rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a front and cross-sectional view of a battery cover airtightness helium inspection fixture proposed by the present invention;

[0031] Figure 2 for Figure 1 The middle plate is deflected 90 degrees;

[0032] Figure 3 for Figure 2 A partial cross-sectional schematic diagram of ;

[0033] Figure 4 for Figure 3 A partial cross-sectional schematic diagram of ;

[0034] Figure 5 for Figure 1 The structural diagram of the placement plate is not provided;

[0035] Figure 6 for Figure 3 The enlarged schematic diagram at A in the middle;

[0036] Figure 7 for Figure 5 The enlarged schematic diagram of point B in the middle;

[0037] Figure 8 for Figure 1 Structural schematic diagram of the middle and lower molds, the connecting shaft and the placement plate;

[0038] Fig. 9 for Figure 8 The schematic diagram of the structure after the placement plate is rotated 90 degrees;

[0039] Fig.10 for Figure 1 A cross-sectional view of

[0040] Fig.11 for Figure 6 Top view of the disengagement mechanism and the fixed shaft.

[0041] Numbers in the figure: 1, upper die; 11, upper cover plate; 12, installation cavity; 13, air cavity; 2, connecting shaft; 21, deflection groove; 211, moving groove 1; 212, deflection spiral groove; 213, moving groove 2; 214, deflection cylinder; 22, lifting groove; 221, lifting slider; 23, connecting slide hole; 3, placement plate; 31, pole groove; 32, explosion-proof groove; 33, guide groove 1; 34, guide groove 2; 4, lower die; 4 1. Sealing ring; 42. Receiving groove; 43. Exhaust hole; 44. Connecting hole; 5. Workpiece; 6. Ejection structure; 61. Ejector rod; 62. Ejection spring; 7. Disengagement mechanism; 71. Disengagement rod; 72. Moving block; 73. Telescopic rod; 74. Reset spring; 75. Moving slider; 76. Moving slide groove; 8. Fixed shaft; 81. Eccentric groove; 9. Movable mold; 91. Extrusion part; 92. Compression spring; 93. Guide rod. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] Reference Figure 1-11 A battery cover gas tightness helium inspection jig includes a lower mold 4, a receiving groove 42 is formed on the upper part of the lower mold 4, a plurality of evenly distributed ejection structures 6 are respectively arranged on the left and right sides of the receiving groove 42, a placement plate 3 is arranged in the storage groove 42 for vertical movement, the top of the ejection structure 6 is connected to the placement plate 3 in an up-and-down manner, and a workpiece 5 is placed on the placement plate 3;

[0044] The left end of the storage slot 42 is rotatably mounted with a connecting shaft 2, the left end of the placement plate 3 is sleeved on the outside of the connecting shaft 2, and the two are connected by sliding up and down, and a disengagement mechanism 7 is also provided on the left side of the placement plate 3, and the disengagement mechanism 7 is connected by sliding up and down with the connecting shaft 2;

[0045] The upper mold 1 is sleeved on the outer portion of the connecting shaft 2, and the two are arranged to slide up and down. A movable mold 9 is arranged to slide up and down inside the upper mold 1.

[0046] An installation cavity 12 is provided on the upper end surface of the upper mold 1, and an air cavity 13 is provided at the bottom of the upper mold 1, and the installation cavity 12 is connected to the air cavity 13. An upper cover plate 11 is screwed on the upper side of the installation cavity 12, and two groups of guide rods 93 are provided at the bottom end of the upper cover plate 11, each group of guide rods 93 includes two guide rods 93, and each guide rod 93 is sleeved with a clamping spring 92, and the bottom end of the clamping spring 92 abuts against the movable mold 9, and the upper surface of the movable film 9 is concave downward to form a through hole, and the guide rod extends into the through hole, and the maximum stroke of the guide rod is not placed below the movable mold 9;

[0047] The movable mold 9 slides up and down and is placed in the installation cavity 12. The lower end of the movable mold 9 is also provided with an extrusion portion 91, which extends into the air cavity 13. After the upper mold 1 is in contact and pressed with the lower mold 4, the workpiece 5 is placed inside the air cavity 13. At this time, the movable mold 9 will press the workpiece 5 tightly against the upper end surface of the placement plate 3 under the action of the clamping spring 92, so that the two are tightly pressed together, which improves the sealing and facilitates the subsequent detection of the air tightness of the workpiece 5.

[0048] The rear surface of the upper mold 1 is provided with three groups of equally spaced air inlet holes, which are connected to the interior of the mounting cavity 12 and are used to connect to an external pipeline, so as to facilitate helium filling into the closed air cavity 13 formed between the upper mold 1 and the lower mold 4, thereby facilitating subsequent testing;

[0049] The left and right sides of the lower mold 4 are penetrated to form an exhaust hole 43, and three connecting holes 44 distributed at equal intervals are opened in the storage groove 42. The connecting hole 44 is connected to the exhaust hole 43. During use, one end of the exhaust hole 43 is connected to the pipeline of the external negative pressure pump, and the other end is blocked. The inside of the exhaust hole 43 is evacuated, and the air cavity 13 is filled with helium. The pumped gas is detected by a helium detector to determine whether the helium in the air cavity 13 enters the exhaust hole 43 through the workpiece 5, and then determine whether the workpiece 5 is deflated.

[0050] A plurality of installation openings distributed in a circumferential array are provided at both left and right ends of the storage slot 42, and a lifting opening is provided in the installation openings;

[0051] The ejection structure 6 includes an ejection spring 62 placed in the lifting port, and an ejector rod 61 is slidably arranged in the installation port. The lower end of the ejector rod 61 is placed in the lifting port, and the bottom end of the ejector rod 61 is widened to form a disc-shaped structure, and the bottom end of the disc-shaped structure abuts against the top end of the ejection spring 62. The design of the ejection structure 6 enables the placement plate 3 to move up and down, and when the upper mold 1 is away from the lower mold 4, the placement plate 3 can be above the lower mold 4, and when the lower mold 4 overlaps with the upper mold 1, the placement plate 3 is completely placed in the receiving groove 42.

[0052] A guide groove 2 34 and a guide groove 1 33 are respectively provided on the left and right sides of the lower end surface of the placement plate 3. Both the guide groove 1 33 and the guide groove 2 34 are arc-shaped structures, and the centers of the circles of the two are collinear with the axis of the connecting shaft 2. The top of the ejection structure 6 is in sliding contact with the guide groove 1 33 and the guide groove 2 34. The multiple ejection structures 6 on the left and right sides are distributed in a circular array, and the central axis of the array between them is collinear with the axis of the connecting shaft 2. In this way, the ejection structure 6 can support the placement plate 3 during its rotation.

[0053] A circular hole 1 is formed at the left end of the placement plate 3, a circular hole 2 is formed at the left end of the upper mold 1, the connecting shaft 2 is inserted into the circular hole 1, and a lifting groove 22 is symmetrically provided at the lower end of the outer surface of the connecting shaft 2. A lifting slider 221 is provided in the lifting groove 22 to slide up and down, and the lifting slider 221 is fixed to the inner wall of the circular hole 1. The design of the lifting slider 221 and the lifting groove 22 enables the placement plate 3 to move up and down along the connecting shaft 2, and the two can rotate synchronously, thereby facilitating the subsequent rotation of the placement plate 3 by ninety degrees;

[0054] Two groups of deflection grooves 21 distributed in a circumferential array are arranged above the outer ring surface of the connecting shaft 2, and each group of deflection grooves 21 includes a movable groove 1 211 arranged below the outer surface of the connecting shaft 2, and a movable groove 213 is arranged above the outer ring surface of the connecting shaft 2. The top of the movable groove 1 211 and the bottom of the movable groove 213 are connected through a deflection spiral groove 212. A deflection cylinder 214 is arranged in the deflection groove 21 to slide up and down, and the deflection cylinder 214 is fixed to the inner wall of the circular hole 2. When the upper mold 1 moves up and down, the deflection cylinder 214 will first move up and down in a straight line in the movable groove 1 211 or the movable groove 213. When it moves into the deflection spiral groove 212, the connecting shaft 2 at this time will be deflected to a certain extent, so that the placement plate 3 can rotate synchronously. After the deflection cylinder 214 is completely moved in the deflection spiral groove 212, the entire placement plate 3 will rotate ninety degrees.

[0055] The arc length between the movable groove 1 211 and the movable groove 213 in the same group of deflection grooves 21 is 1 / 4 of the circumference of the entire connecting shaft, and the top of the movable groove 213 passes through the top of the connecting shaft 2. After the deflection cylinder 214 is completely moved in the deflection spiral groove 212, the entire connecting shaft 2 and the placement plate 3 will rotate ninety degrees, and the design of the movable groove 213 is also convenient for the installation and disassembly of the deflection cylinder 214.

[0056] The bottom end of the connecting shaft 2 is hollowed out to form a cavity, and a connecting slide hole 23 is provided on the outer surface of the connecting shaft 2, and the connecting slide hole 23 is connected to the cavity;

[0057] A fixed shaft 8 is fixed to the left end of the storage groove 42, and the fixed shaft 8 is placed inside the cavity, and the connecting shaft 2 is rotatably connected to the fixed shaft 8. An adjusting slide groove is provided at the bottom of the outer surface of the fixed shaft 8, and the adjusting slide groove is located on the left side of the connecting slide hole 23. An eccentric groove 81 is provided above the outer surface of the fixed shaft 8, and the eccentric groove 81 is connected to the top of the adjusting slide groove. The design of the adjusting slide groove enables the disengagement mechanism 7 to move up and down together with the placement plate 3 when it moves up and down. The disengagement mechanism 7 can also make the disengagement rod 71 protrude or shrink as the placement plate 3 rotates, which is convenient for removing the workpiece 5. The depth of the eccentric groove 81 gradually increases from front to back. During the process of the disengagement mechanism 7 deflecting forward, as the depth of the eccentric groove 81 decreases, the disengagement mechanism 7 will gradually protrude, thereby causing the left end portion of the workpiece 5 to be lifted up, and there will be a reduction between the entire workpiece 5 and the placement plate 3, so that the two will not be adsorbed together, which is convenient for removing the workpiece 5.

[0058] An installation cavity is provided on the inner side wall of the circular hole 1 of the placement plate 3, the left end of the installation cavity is connected to the outside, and a through hole is also provided on the top of the placement plate 3;

[0059] The disengagement mechanism 7 includes a moving block 72 which is slidably arranged in the installation cavity. A telescopic rod 73 is arranged at the left end of the moving block 72. The left end of the telescopic rod 73 is placed outside the installation cavity and is in sliding contact with the eccentric groove 81. A return spring 74 is abutted on the right side of the installation cavity. The left end of the return spring 74 abuts on the right end of the moving block 72. When the disengagement mechanism 7 is rotating, the telescopic rod 73 will slide along the eccentric groove 81. Since the depth of the eccentric groove 81 gradually increases from front to back, the telescopic rod 73 will be pushed toward the inside of the installation cavity.

[0060] The upper right side of the moving block 72 is designed as an inclined surface, and a moving slide groove 76 is opened on the inclined surface. The cross-section of the moving slide groove 76 is a convex structure. A moving slider 75 is slidably arranged in the moving slide groove 76. A disengagement rod 71 is connected above the moving slider 75. The disengagement rod 71 passes through the through hole and is placed above the placement plate 3. When the placement plate 3 rotates forward, the moving block 72 moves to the right, thereby pushing the disengagement rod 71 to extend upward. When it rotates backward, the moving block 72 moves to the left, thereby pushing the disengagement rod 71 to retract upward.

[0061] The upper surface of the placement plate 3 is provided with symmetrically distributed pole grooves 31 at both ends, and an explosion-proof groove 32 is provided at the center of the upper portion of the placement plate 3. The bottom ends of the two pole grooves 31 and the explosion-proof groove 32 are provided with air holes, which are connected to the connecting hole 44 for gas circulation, thereby facilitating the detection of air tightness.

[0062] Sealing pads are provided on the outside of the pole slot 31 and the explosion-proof slot 32, and sealing rings 41 are provided on the upper surface of the placement plate 3 and the inner wall of the storage slot 42. Positive and negative poles are integrally provided on the left and right sides below the workpiece 5, and an explosion-proof structure is also provided at the center. The positive pole, negative pole and explosion-proof structure are placed in the corresponding pole slot 31 and explosion-proof slot 32. The sizes of the positive pole, negative pole and explosion-proof structure are smaller than those of the pole slot 31 and explosion-proof slot 32, so they can be sealed to facilitate airtightness detection. The design of the sealing ring 41 improves the sealing when the upper mold 1 is pressed.

[0063] Working principle: In actual use, the fixture is placed on the platform, and the upper surface of the upper mold 1 is also connected to an external lifting structure (the lifting structure is a corresponding structure such as a cylinder, an electric push rod, etc., which can be selected according to actual needs), the helium tank is connected to the air inlet of the upper mold 1 through a pipeline, a valve and an air pump, one end of the air extraction hole 43 is connected to the pipeline of the external negative pressure pump, and the other end is blocked, and the pipeline is also connected to a helium detector;

[0064] When the workpiece 5 (i.e., the battery cover) is tested for air tightness (the upper mold 1 and the lower mold 4 are pressed together in the initial state), the lifting structure causes the upper mold 1 to move upward as a whole. During the upward movement of the upper mold 1, since a plurality of ejection structures 6 are arranged in the receiving cavity of the lower mold 4, the ejector rods 61 in the ejection structures 6 have a tendency to move upward under the action of the ejection springs 62. When the upper mold 1 moves upward, the placement plate 3 will move upward accordingly until the bottom end of the placement plate 3 is above the lower mold 4. At this time, the upper mold 1 continues to move upward under the action of the lifting structure.

[0065] When the upper mold 1 moves upward, the two deflection cylinders 214 in the upper mold 1 will move upward in a straight line in the moving groove 1 211. When it moves into the deflection spiral groove 212, the connecting shaft 2 will deflect to a certain extent until the connecting shaft 2 rotates 90 degrees. During the rotation of the connecting shaft 2, the placement plate 3 will also rotate with it. After that, the deflection cylinder 214 moves into the moving groove 2, and the connecting shaft 2 cannot rotate. At this time, the placement plate 3 rotates 90 degrees into the Figure 2 As shown, the workpiece 5 can now be placed on the placement plate 3;

[0066] When the placement plate 3 moves upward under the action of the ejection structure 6, the disengagement mechanism 7 in the placement plate 3 will move upward along the moving slide groove 76 and the adjustment slide groove. Then, during the rotation of the placement plate 3, the disengagement mechanism 7 will rotate together with the placement plate 3, and the telescopic rod 73 will slide along the eccentric groove 81. Since the depth of the eccentric groove 81 gradually increases from front to back, the telescopic rod 73 will be pushed toward the inside of the installation cavity, and the moving block 72 moves to the right under the action of the telescopic rod 73, and then pushes the disengagement rod 71 to extend upward, so that the left end portion of the workpiece 5 is lifted up, and there will be a gap between the entire workpiece 5 and the placement plate 3, so that the two will not be adsorbed together. At this time, the workpiece 5 after inspection can be removed, and a new workpiece 5 to be inspected can be placed.

[0067] Then the upper mold 1 moves upward, and when passing through the deflection spiral groove 212, the placement plate 3 rotates inward and is located directly above the storage groove 42. At this time, the disengagement rod 71 is placed inside the placement plate 3, and the entire workpiece 5 is placed flat on the placement plate 3. When the upper mold 1 approaches the workpiece 5, the movable mold 9 in the upper mold 1 will press the workpiece 5, and make the entire placement plate 3 and the workpiece 5 move downward together. At this time, the vacuum hole 43 is continuously drawn outward, and the air cavity 13 is filled with gas. The helium detector is used to detect whether the extracted gas contains helium. Then the upper mold 1 moves upward again, and the above operation is repeated.

[0068] By arranging a connecting shaft 2 between the upper die 1 and the lower die 4, and two groups of deflection grooves 21 are arranged on the connecting shaft 2, when the upper die 1 is away from or close to the lower die 4, the connecting shaft 2 can be rotated 90 degrees clockwise or counterclockwise, and the placement plate 3 is arranged in the lower die 4 by the ejection structure 6 to be lifted up and down, and the placement plate 3 is connected to the connecting shaft 2, and can be rotated 90 degrees together with the connecting shaft 2. When the upper die 1 is away from the lower die 4, the placement plate 3 is located outside the two, so that it is convenient to take the workpiece 5 above the placement plate 3 and place a new workpiece 5, so as to avoid the user's hand being pinched due to misoperation when the upper die 1 is pressed, thereby improving safety;

[0069] By arranging a disengagement mechanism 7 in the placement plate 3, the disengagement mechanism 7 can be pushed out or retracted when the placement plate 3 rotates, and then can be pushed upward when the placement plate 3 is away from the lower mold 4, so that the left end part of the workpiece 5 is lifted up, and there will be a gap between the entire workpiece 5 and the placement plate 3, so that the two will not be adsorbed together, thereby facilitating the removal of the workpiece 5.

[0070] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery cover airtightness helium test jig, comprising a lower mold (4), characterized in that: A receiving groove (42) is formed in a depression above the lower mold (4), and a plurality of evenly distributed ejection structures (6) are respectively arranged at the left and right ends of the receiving groove (42). A placement plate (3) is arranged in the receiving groove (42) to move up and down, and the top of the ejection structure (6) is connected to the placement plate (3) in an up-and-down manner, and a workpiece (5) is placed above the placement plate (3); The left end of the storage groove (42) is rotatably mounted with a connecting shaft (2), the left end of the placement plate (3) is sleeved on the outside of the connecting shaft (2), and the two are connected by sliding up and down, and a disengagement mechanism (7) is also arranged on the left side inside the placement plate (3), and the disengagement mechanism (7) is connected by sliding up and down with the connecting shaft (2); The outer part of the connecting shaft (2) is sleeved with an upper mold (1), and the two are arranged to slide up and down. A movable mold (9) is arranged inside the upper mold (1) to slide up and down.

2. A battery cover airtightness helium test fixture according to claim 1, characterized in that: The upper end surface of the upper mold (1) is provided with a mounting cavity (12), the bottom of the upper mold (1) is provided with an air cavity (13), and the mounting cavity (12) is communicated with the air cavity (13), an upper cover plate (11) is screw-mounted above the mounting cavity (12), and two groups of guide rods (93) are provided at the bottom end of the upper cover plate (11), each group of guide rods (93) includes two guide rods (93), each guide rod (93) is sleeved with a clamping spring (92), and the bottom end of the clamping spring (92) is in contact with the movable mold (9); The movable mold (9) is slidably disposed in the installation cavity (12) up and down, and a pressing portion (91) is also provided at the lower end of the movable mold (9), and the pressing portion (91) extends into the air cavity (13).

3. A battery cover airtightness helium test fixture according to claim 1, characterized in that: The rear surface of the upper mold (1) is provided with three groups of air inlet holes distributed at equal intervals, and the air inlet holes are connected to the interior of the installation cavity (12); The lower mold (4) has air extraction holes (43) formed through the left and right sides thereof, and the receiving groove (42) has three communicating holes (44) distributed at equal intervals, and the communicating holes (44) are connected to the air extraction holes (43).

4. A battery cover airtightness helium test fixture according to claim 1, characterized in that: The left and right ends of the storage groove (42) are each provided with a plurality of installation openings distributed in a circumferential array, and the installation openings are provided with lifting openings; The ejection structure (6) comprises an ejection spring (62) disposed in the lifting port, a push rod (61) is slidably disposed in the installation port, the lower end of the push rod (61) is disposed in the lifting port, and the bottom end of the push rod (61) is widened to form a disc-shaped structure, the bottom end of the disc-shaped structure abuts against the top end of the ejection spring (62).

5. A battery cover airtightness helium test fixture according to claim 4, characterized in that: The left side and right side of the lower end surface of the placement plate (3) are respectively provided with a second guide groove (34) and a first guide groove (33); the first guide groove (33) and the second guide groove (34) are both arc-shaped structures, and the centers of the two circles are colinear with the axis of the connecting shaft (2); the top end of the ejection structure (6) is in sliding contact with the first guide groove (33) and the second guide groove (34).

6. A battery cover airtightness helium test fixture according to claim 1, characterized in that: A circular hole 1 is formed at the left end of the placement plate (3), a circular hole 2 is formed at the left end of the upper mold (1), a connecting shaft (2) is inserted into the circular hole 1, a lifting groove (22) is symmetrically provided at the lower end of the outer surface of the connecting shaft (2), a lifting slider (221) is provided in the lifting groove (22) for sliding up and down, and the lifting slider (221) is fixed to the inner wall of the circular hole 1; Two groups of deflection grooves (21) distributed in a circumferential array are arranged above the outer ring surface of the connecting shaft (2), each group of the deflection grooves (21) includes a first moving groove (211) arranged below the outer ring surface of the connecting shaft (2), a second moving groove (213) is arranged above the outer ring surface of the connecting shaft (2), the top end of the first moving groove (211) and the bottom end of the second moving groove (213) are connected through a deflection spiral groove (212), and a deflection cylinder (214) is arranged in the deflection groove (21) to slide up and down, and the deflection cylinder (214) is fixed to the inner wall of the second circular hole.

7. A battery cover airtightness helium test fixture according to claim 6, characterized in that: The arc length between the first moving groove (211) and the second moving groove (213) in the same group of the deflection grooves (21) is 1 / 4 of the circumference of the entire connecting shaft, and the top end of the second moving groove (213) passes through the top of the connecting shaft (2).

8. A battery cover airtightness helium test fixture according to claim 7, characterized in that: The bottom end of the connecting shaft (2) is hollowed out to form a cavity, and a connecting sliding hole (23) is formed on the side wall of the cavity. A fixed shaft (8) is fixed to the left end of the receiving groove (42), the fixed shaft (8) is placed inside the cavity, and the connecting shaft (2) is rotatably connected to the fixed shaft (8), an adjustment slide groove is provided below the outer surface of the fixed shaft (8), the adjustment slide groove is located on the left side of the connecting slide hole (23), an eccentric groove (81) is provided above the outer surface of the fixed shaft (8), the eccentric groove (81) is connected to the top of the adjustment slide groove, and the depth of the eccentric groove (81) gradually increases from front to back.

9. A battery cover airtightness helium test fixture according to claim 8, characterized in that: An installation cavity is provided on the inner side wall of the circular hole 1 of the placement plate (3), the left end of the installation cavity is connected to the outside, and a through hole is also provided on the top of the placement plate (3); The disengagement mechanism (7) comprises a moving block (72) slidably arranged in the installation cavity, a telescopic rod (73) is arranged at the left end of the moving block (72), the left end of the telescopic rod (73) is placed outside the installation cavity and is in sliding contact with the eccentric groove (81), a return spring (74) is abutted on the right side of the installation cavity, and the left end of the return spring (74) is abutted against the right end of the moving block (72); The upper right side of the moving block (72) is designed as an inclined surface, and a moving slide groove (76) is provided on the inclined surface. The cross section of the moving slide groove (76) is a convex structure. A moving slider (75) is slidably arranged in the moving slide groove (76). A disengagement rod (71) is connected above the moving slider (75). The disengagement rod (71) passes through the through hole and is placed above the placement plate (3).

10. A battery cover airtightness helium test fixture according to claim 1, characterized in that: The upper surface of the placement plate (3) is provided with symmetrically distributed pole grooves (31) at both ends, and an explosion-proof groove (32) is provided at the center of the upper portion of the placement plate (3). Air holes are provided at the bottom ends of the two pole grooves (31) and the explosion-proof groove (32), and the air holes are connected to the connecting hole (44); The exteriors of the pole slot (31) and the explosion-proof slot (32) are both provided with sealing pads, and the upper surface of the placement plate (3) and the inner wall of the storage slot (42) are both provided with sealing rings (41).

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