A pressure test device for cans

Abstract

The invention discloses a pressure test device for cans, comprising a pressure tester, wherein a hydraulic cylinder is fixedly connected to the center of the upper end surface of the pressure tester, a hydraulic rod is fixedly connected to the bottom of the hydraulic cylinder, a lower end of the hydraulic rod penetrates and extends out of the upper side of the inner surface of the pressure tester and is fixedly connected to a pressure plate, the pressure plate is arranged in the pressure tester and is movably connected to the inner wall of the pressure tester, a fixed box fixedly connected to the bottom of the pressure plate is pressed downward, and during the downward pressing process of the fixed box, the can is extended into an area formed between three groups of fixed arc plates, when the can is extended into a predetermined position, a digital control platform controls a motor to rotate a turntable, a first arc groove on the turntable rotates with the turntable to squeeze a T-shaped slide bar, and due to the limitation of the second arc groove, the T-shaped slide bar moves inward, that is, the fixed arc plate moves inward, thereby fixing the can, thereby reducing the problem that the can is easy to fly away after receiving pressure, thereby endangering the personal safety of the operator.

Description

Technical Field

[0001] The invention relates to the technical field of pressure resistance instruments, in particular to a pressure resistance testing device for cans. Background Art

[0002] The pressure test of a container refers to applying pressure to the container to test its ability to withstand deformation. During the mass production of cans, a specified number of cans from each batch need to be randomly selected for inspection. The inspection methods include appearance inspection, pressure test, etc. The inspection results are used to measure whether the production of this batch of cans meets the quality standards.

[0003] There are generally two types of pressure tests for cans. The first is to squeeze the can in the up and down directions to test the can's ability to resist deformation under up and down pressure. The second is to open a hole in the top of the can and inject or suck air into or out of the top of the can to create a pressure difference between the inside and outside of the can to test the can wall's ability to resist deformation.

[0004] GBN200A pressure tester is a device for pressure testing of cans. The main principle is to put the cans into the GBN200A pressure tester. The GBN200A pressure tester controls the hydraulic cylinder through the digital control platform to drive the pressure plate in the GBN200A pressure tester to move downward, thereby squeezing the cans below. Through continuous pressurization, the ability of the cans to resist deformation when subjected to pressure in the upper and lower directions is tested and feedback is given to the screen display of the digital control platform.

[0005] When the above-mentioned GBN200A pressure tester performs pressure tests on cans, at least the following problems have not been improved: 1. As the pressure plate moves downward, the vibration of the machine itself or the influence of the external environment causes deviations in the placement of the cans. Therefore, when the pressure plate is pressed down, the uneven force may cause the cans to shift, which in turn affects the inaccuracy of the measured values; 2. When holding the can and inserting it into the GBN200A pressure tester, an incorrect operation of the test may cause the pressure plate to press down, thereby damaging the hand inserted into the GBN200A pressure tester, thereby causing personal injury.

[0006] Therefore, a pressure resistance testing device for cans is proposed. Summary of the invention

[0007] The object of the present invention is to provide a pressure resistance testing device for cans to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pressure test device for cans, comprising a pressure tester, a hydraulic cylinder is fixedly connected to the center of the upper end surface of the pressure tester, a hydraulic rod is fixedly connected to the bottom of the hydraulic cylinder, the lower end of the hydraulic rod penetrates and extends out of the upper side of the inner surface of the pressure tester and is fixedly connected to a pressure plate, the pressure plate is arranged in the pressure tester and movably connected to the inner wall of the pressure tester, a fixing mechanism is fixedly connected to the bottom of the pressure plate, a marking assembly and a first expansion membrane are arranged inside the fixing mechanism, and an expansion arc plate is movably connected to the upper end surface of the fixing mechanism, a placing table is slidably connected to the bottom of the inner surface of the pressure tester, and a clamping rod is fixedly connected to the right end surface of the placing table;

[0009] The fixing mechanism includes a fixing box, a motor, a turntable, a first arc groove, a T-shaped slide bar, a fixed arc plate, and a second arc groove. The motor is fixedly connected to the bottom of the inner surface of the fixing box, and the output shaft of the motor is fixedly connected to the turntable. The upper end surface of the turntable is provided with three groups of first arc grooves distributed in an equidistant ring shape, and a group of T-shaped slide bars are extended into and slidably connected to each group of the first arc grooves. The upper end of each group of T-shaped slide bars extends through the first arc groove and is fixedly connected to the bottom of the fixed arc plate. Each group of fixed arc plates extends through a group of second arc grooves and is slidably connected. The three groups of the second arc grooves are equidistantly arranged in an annular shape on the upper end surface of the fixing box, and a marking component is provided on the inner side surface of one group of the fixed arc plates.

[0010] Preferably, the marking assembly includes a marking bin, a connecting rod, a marking tube, and a torsion spring. The marking bin is opened at the center of the inner surface of a group of fixed arc plates. A connecting rod is fixedly connected to the marking bin. The marking tube is sleeved and fixed in the middle of the outer surface of the connecting rod. The outer surface of the connecting rod is located at both end areas of the marking tube and the torsion spring is sleeved. One end of the torsion spring is fixed to the marking tube and the other end is against the inner wall of the marking bin. The curved surface of the marking tube is engraved with the reverse word "test product".

[0011] By adopting the above technical scheme, before the can is extended into the predetermined position to be fixed, the digital control platform controls the motor to rotate the turntable, and the first arc groove on the turntable rotates with the turntable to squeeze the T-shaped slide bar. Since the notch edge of the second arc groove limits the movement of the fixed arc plate, the T-shaped slide bar moves toward the center of the upper end surface of the fixed box, that is, the fixed arc plate moves toward the center of the upper end surface of the fixed box, thereby clamping and fixing the can. After the can is fixed, the turntable stops rotating, thereby stopping the movement of the fixed arc plate, and a group of marking tubes on the fixed arc plate contact the side of the can and roll with the relative displacement of the can and the fixed arc plate, so that the word "test product" on the marking tube is coated on the side of the can, so that the tested can can be marked in cooperation with the fixing mechanism, so as to facilitate the distinction between tested cans and untested cans, and the setting of the torsion spring enables the marking tube to return to the initial state after each test, so that it can be correctly coated each time, which is practical and convenient.

[0012] Preferably, the expansion arc plate extends through the fixed arc plate and is slidably connected, and one end of the expansion arc plate extending into the fixed arc plate is fixedly connected to a plurality of groups of first springs, and the lower end of each group of the first springs is fixedly connected to the bottom of the inner surface of the fixed arc plate.

[0013] By adopting the above technical solution, when performing pressure resistance tests on some cans with smaller heights, when the cans extend into the area formed between the three groups of fixed arc plates, the extended arc plates contact the bottom surface and expand and contract inward under pressure, thereby facilitating testing of cans with smaller heights.

[0014] Preferably, there are two groups of the first expansion membranes, which are respectively fixedly connected to the bottom of the inner surface of the other two groups of fixed arc plates without marking components. An elastic hose is fixedly connected to the bottom of the first expansion membrane. The right end of the elastic hose passes through the fixed arc plate and extends into the second expansion membrane. The second expansion membrane is fixedly connected at the center of the inner surface of the other two groups of fixed arc plates without marking components.

[0015] By adopting the above technical solution, in the process of the expansion arc plate moving downward, the expansion arc plate squeezes the first expansion membrane at the bottom of the inner surface of the fixed arc plate, the first expansion membrane sucks in air and sends the air into the second expansion membrane through the elastic hose, and the second expansion membrane swells and fits tightly against the irregular-shaped side of the can, thereby making the subsequent fixation of the can with irregular sides more stable, practical and efficient.

[0016] Preferably, a pull rod is fixedly connected to the right end face of the placing table, and the right end of the pull rod extends through and is slidably connected to the first opening. The first opening is opened at a position on the right end face of the pressure resistance instrument corresponding to the right end face of the placing table. A slider is fixedly connected to the bottom of the pull rod, and the slider extends into and is slidably connected to a slide groove, and the slide groove is opened at the bottom of the first opening.

[0017] By adopting the above technical solution, when testing the cans, the pull rod is pulled to extend the placement table out of the pressure tester. The placement table is provided with pressure test marking points. The cans to be pressure tested are placed on the pressure test marking points on the placement table. There is no need to reach into the pressure tester by hand to place the cans, thereby reducing the chance of the tester's misoperation causing the pressure tester to work and causing injury to the hands inserted into the pressure tester.

[0018] Preferably, the card rod extends through and is slidably connected to a slider, the card rod extending into one end of the slider is fixedly connected to a second spring, the upper end of the second spring is fixedly connected to the upper side of the inner surface of the slider, the right side of the upper end face of the card rod is fixedly connected to a control rod, the control rod extends through and is slidably connected to a second opening, the second opening is opened on the right end face of the slider, a card slot is opened at the bottom of the right end of the slide, and the size of the card slot and the card rod match.

[0019] By adopting the above technical scheme, after placing the cans that need to be pressure tested on the pressure test mark point of the placement table, the pull rod is pushed to move, and when the clamping rod is facing the clamping slot, the clamping rod extends into the clamping slot due to the elastic force of the second spring, thereby fixing the placement table, thereby preventing the placement table from moving when the pressure test is performed on the cans on the placement table, and when the clamping rod is clamped into the clamping slot, the can is just in the best pressure test position in the pressure tester, thereby facilitating the pressure test, which is practical and convenient.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention controls the motor through a digital control platform by designing a fixing mechanism, so that three groups of fixed arc plates clamp the cans, so that the cans can correct the test position during the test, and the cans are not easily offset, thereby improving the accuracy of the measurement data, and before the cans are extended into the predetermined position to be fixed, relative displacement occurs in the area formed between the cans and the three groups of fixed arc plates, so that the words "test product" are coated on the side of the cans for marking, so that the cans can be distinguished, which is practical and convenient. The setting of the torsion spring between the connecting rod and the marking tube enables the marking tube to return to the initial state after each test, so that the coating can be correct each time;

[0022] 2. The present invention pulls out the placement table by holding the pull rod and the control rod under the pull rod, so as to place the can on the placement table at the pressure test mark point, thereby eliminating the need to reach into the pressure tester to place the can by hand, reducing the probability of the tester causing the pressure tester to work due to misoperation by the tester, thereby causing damage to the hand that reaches into the pressure tester. The cooperation between the card slot and the card rod in the slider enables the placement table to be promptly and accurately fixed at a better pressure test position in the pressure tester when the card rod is pushed to return the placement table to the pressure tester, thereby facilitating the pressure test;

[0023] 3. The present invention facilitates testing of cans with smaller heights by causing the expansion arc plate to contact and contract the bottom surface under pressure when the can is extended into the area formed between the three groups of fixed arc plates. The second expansion membrane and the first expansion membrane in the fixed arc plate are arranged to cause the second expansion membrane to swell and fit tightly against the irregularities on the side of the can, thereby cooperating with the fixing mechanism to more stably fix cans with smaller heights and irregular shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall structural view of the present invention;

[0025] Figure 2 This is an overall structural view of the fixing mechanism of the present invention;

[0026] Figure 3 It is a combined view of the T-shaped sliding bar and the fixed arc plate of the present invention;

[0027] Figure 4 A top view of the fixing mechanism of the present invention;

[0028] Figure 5 A relative distribution view of the first arc-shaped groove in the rotating disk of the present invention;

[0029] Figure 6 It is a combined view of the fixed arc plate and the extended arc plate of the present invention;

[0030] Figure 7 A combined view of the fixed arc plate and the second expansion membrane of the present invention;

[0031] Figure 8 It is a cross-sectional view inside the fixed box of the present invention;

[0032] Fig. 9 is a cross-sectional view of the interior of the slider of the present invention;

[0033] Fig.10 For the present invention Figure 3 A magnified image of A;

[0034] Fig.11 For the present invention Figure 1 Enlarged view of B.

[0035] In the figure:

[0036] 1. Pressure tester; 11. Hydraulic cylinder; 12. Hydraulic rod; 13. Pressing plate;

[0037] 2. Fixing mechanism; 21. Fixing box; 22. Motor; 23. Turntable; 24. First arc groove; 25. T-shaped slide bar; 26. Fixed arc plate; 27. Second arc groove;

[0038] 3. Marking assembly; 31. Marking chamber; 32. Connecting rod; 33. Marking tube; 34. Torsion spring;

[0039] 4. Extended arc plate; 41. First spring;

[0040] 5. first expansion membrane; 51. elastic hose; 52. second expansion membrane;

[0041] 6. Placement table; 61. Pull rod; 62. First opening; 63. Sliding block; 64. Sliding groove;

[0042] 7. Clamping rod; 71. Second spring; 72. Control rod; 73. Second opening; 74. Clamping slot. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figures 1 to 11 , the present invention provides a technical solution:

[0045] A pressure test device for cans, comprising a pressure tester 1, wherein a hydraulic cylinder 11 is fixedly connected to the center of the upper end surface of the pressure tester 1, a hydraulic rod 12 is fixedly connected to the bottom of the hydraulic cylinder 11, a lower end of the hydraulic rod 12 penetrates and extends out of the upper side of the inner surface of the pressure tester 1 and is fixedly connected to a pressing plate 13, the pressing plate 13 is arranged in the pressure tester 1 and is movably connected to the inner wall of the pressure tester 1, a fixing mechanism 2 is fixedly connected to the bottom of the pressing plate 13, a marking assembly 3 and a first expansion membrane 5 are arranged inside the fixing mechanism 2, and an expansion arc plate 4 is movably connected to the upper end surface of the fixing mechanism 2, a placing table 6 is slidably connected to the bottom of the inner surface of the pressure tester 1, and a clamping rod 7 is fixedly connected to the right end surface of the placing table 6;

[0046] The fixing mechanism 2 includes a fixing box 21, a motor 22, a turntable 23, a first arc groove 24, a T-shaped slide bar 25, a fixed arc plate 26, and a second arc groove 27. The motor 22 is fixedly connected to the bottom of the inner surface of the fixing box 21, and the output shaft of the motor 22 is fixedly connected to the turntable 23. The upper end surface of the turntable 23 is provided with three groups of first arc grooves 24 distributed in an equidistant ring shape. A group of T-shaped slide bars 25 are extended into and slidably connected to each group of the first arc grooves 24. The upper end of each group of the T-shaped slide bars 25 extends through the first arc groove 24 and is fixedly connected to the bottom of the fixed arc plate 26. Each group of the fixed arc plates 26 extends through a group of second arc grooves 27 and is slidably connected. The three groups of the second arc grooves 27 are equidistantly arranged in an annular shape on the upper end surface of the fixing box 21, and a marking component 3 is provided on the inner side surface of one group of the fixed arc plates 26.

[0047] As an embodiment of the present invention, Figure 3 and Fig.10 As shown, the marking component 3 includes a marking bin 31, a connecting rod 32, a marking tube 33, and a torsion spring 34. The marking bin 31 is opened at the center of the inner surface of a set of fixed arc plates 26. The connecting rod 32 is fixedly connected to the marking bin 31. The marking tube 33 is sleeved and fixed to the middle part of the outer surface of the connecting rod 32, and the outer surface of the connecting rod 32 is located at the two end areas of the marking tube 33 to sleeve the torsion spring 34, and one end of the torsion spring 34 is fixed to the marking tube 33 and the other end is against the inner wall of the marking bin 31, and the curved surface of the marking tube 33 is engraved with the reverse word "test product".

[0048] During operation, before the can is extended into the predetermined position to be fixed, the digital control platform controls the motor 22 to operate to rotate the turntable 23, and the first arc groove 24 on the turntable 23 rotates with the turntable 23 to squeeze the T-shaped slide bar 25. Since the notch edge of the second arc groove 27 limits the movement of the fixed arc plate 26, the T-shaped slide bar 25 moves toward the center of the upper end surface of the fixed box 21, that is, the fixed arc plate 26 moves toward the center of the upper end surface of the fixed box 21, thereby clamping and fixing the can. After the can is fixed, the turntable 23 stops rotating, thereby stopping the movement of the fixed arc plate 26. A marking tube 33 on a set of fixed arc plates 26 contacts the side of the can and rolls with the relative displacement between the can and the fixed arc plate, so that the words "test product" on the marking tube 33 are coated on the side of the can, thereby cooperating with the fixing mechanism 2 to mark the tested cans, so as to distinguish between tested cans and untested cans, and the setting of the torsion spring 34 allows the marking tube 33 to return to the initial state after each test, so that the fixing mechanism 2 can more accurately coat and mark the side of the can each time it is working, which is practical and convenient.

[0049] As an embodiment of the present invention, Figure 6 As shown, the extended arc plate 4 penetrates into the fixed arc plate 26 and is slidably connected. One end of the extended arc plate 4 extending into the fixed arc plate 26 is fixedly connected to a plurality of groups of first springs 41 , and the lower end of each group of the first springs 41 is fixedly connected to the bottom of the inner surface of the fixed arc plate 26 .

[0050] During operation, when conducting a pressure resistance test on some cans with smaller heights, when the cans extend into the area formed by the three groups of fixed arc plates 26, the upper end surface of the extended arc plate 4 is pressed downward by the pressure plate 13 and moves and retracts toward the inside of the fixed arc plate 26, thereby cooperating with the fixing mechanism 2 to test cans with smaller heights. The device structure can be suitable for the pressure detection requirements of cans of different heights and remain in a fixed state during the detection process, thereby improving the scope of application and stability under the detection state.

[0051] As an embodiment of the present invention, Figure 2 , Figure 6 and Figure 7 As shown, there are two groups of first expansion membranes 5 which are respectively fixedly connected to the bottom of the inner surface of the other two groups of fixed arc plates 26 where the marking components 3 are not set. An elastic hose 51 is fixedly connected to the bottom of the first expansion membrane 5. The right end of the elastic hose 51 penetrates through the fixed arc plate 26 and extends into the second expansion membrane 52. The second expansion membrane 52 is fixedly connected at the center of the inner surface of the other two groups of fixed arc plates 26 where the marking components 3 are not set.

[0052] During operation, as the expansion arc plate 4 moves downward, the expansion arc plate 4 squeezes the first expansion membrane 5 at the bottom of the inner surface of the fixed arc plate 26. The first expansion membrane 5 inhales air and sends the air to the second expansion membrane 52 through the elastic hose 51. The second expansion membrane 52 swells and fits tightly against the irregular-shaped side of the can, filling the gap between the can and the bottom of the fixed arc plate 26. The fixing mechanism 2 and the expansion arc plate 4 can be used to more stably fix the cans with smaller heights and irregular shapes. The second expansion membrane 52 in the expanded state is used to flexibly clamp and fix the cans, reducing hard clamping wear.

[0053] As an embodiment of the present invention, Figure 1 and Fig.11 As shown, a pull rod 61 is fixedly connected to the right end face of the placement table 6, and the right end of the pull rod 61 extends through and is slidably connected to the first opening 62. The first opening 62 is opened at a position where the right end face of the pressure resistance instrument 1 corresponds to the right end face of the placement table 6. A slider 63 is fixedly connected to the bottom of the pull rod 61, and the slider 63 extends into and is slidably connected to a slide groove 64. The slide groove 64 is opened at the bottom of the first opening 62.

[0054] During operation, when testing the cans, pull the pull rod 61 to extend the placement table 6 out of the pressure tester 1. The placement table 6 is provided with pressure test marking points. The cans to be pressure tested are placed on the pressure test marking points of the placement table 6, so there is no need to reach into the pressure tester 1 by hand to place the cans, thereby reducing the chance of the tester's misoperation causing the pressure tester 1 to work and causing injury to the hand inserted into the pressure tester 1.

[0055] As an embodiment of the present invention, Fig. 9 and Fig.11 As shown, the card rod 7 extends through and is slidably connected to the slider 63, and one end of the card rod 7 extending into the slider 63 is fixedly connected to a second spring 71, and the upper end of the second spring 71 is fixedly connected to the upper side of the inner surface of the slider 63, and the right side of the upper end surface of the card rod 7 is fixedly connected to a control rod 72, and the control rod 72 extends through and is slidably connected to a second opening 73, and the second opening 73 is opened on the right end surface of the slider 63, and a card slot 74 is opened at the bottom of the right end of the slide groove 64, and the card slot 74 and the card rod 7 match in size.

[0056] During operation, after placing the cans to be pressure tested on the pressure test mark point of the placement table 6, push the pull rod 61 to move, and when the clamping rod 7 faces the clamping slot 74, the clamping rod 7 extends into the clamping slot 74 due to the elastic force of the second spring 71, thereby fixing the placement table 6, thereby preventing the placement table 6 from moving when the pressure test is performed on the cans on the placement table 6, and when the clamping rod 7 is clamped into the clamping slot 74, the can is just in the better pressure test position in the pressure tester 1, so that it can be fixed in the better pressure test position in the pressure tester 1 in time when the placement table 6 returns to the pressure tester 1.

[0057] Working principle: When working, the hydraulic cylinder 11 and the motor 22 are controlled by the digital control platform of the pressure tester 1. When testing the cans, hold the pull rod 61 and the control rod 72 below the pull rod 61. At this time, the control rod 72 pulls the clamping rod 7 out of the clamping slot 74, and pulls the pull rod 61 to make the placement table 6 extend out of the pressure tester 1. The placement table 6 is provided with a pressure test mark point. The cans to be tested for pressure are placed on the pressure test mark point of the placement table 6, so that there is no need to put the cans into the pressure tester 1 by hand, thereby reducing In order to reduce the possibility of the pressure tester 1 being operated due to the tester's misoperation, thereby causing damage to the hand inserted into the pressure tester 1, the pull rod 61 is pushed to move, and when the clamping rod 7 faces the clamping slot 74, the clamping rod 7 is inserted into the clamping slot 74 due to the elastic force of the second spring 71, thereby fixing the placement table 6, thereby preventing the placement table 6 from moving when the pressure test is performed on the cans on the placement table 6, and when the clamping rod 7 is clamped into the clamping slot 74, the cans are just in the best pressure test position in the pressure tester 1, thereby facilitating the pressure test, which is practical and convenient;

[0058] The digital control platform of the pressure tester 1 controls the hydraulic cylinder 11 to work so that the hydraulic rod 12 moves downward to drive the pressure plate 13 to press down. The fixed box 21 fixedly connected to the bottom of the pressure plate 13 is pressed down as well. During the pressing process of the fixed box 21, the can is extended into the area formed between the three groups of fixed arc plates 26. When it is extended into the predetermined position, the digital control platform controls the motor 22 to work so that the turntable 23 rotates. The first arc groove 24 on the turntable 23 rotates with the turntable 23 to squeeze the T-shaped slide bar 25. Due to the limitation of the second arc groove 27, the T-shaped slide bar 25 moves inward, that is, the fixed arc plate 26 moves inward, thereby fixing the can, so that the can is moved to the test position during the test. Correction is performed, and the can is not easy to deviate, thereby improving the accuracy of the measurement data. Before the can is extended into the predetermined position to be fixed, a relative displacement occurs in the area formed between the can and the three groups of fixed arc plates 26. The marking tube 33 on one group of fixed arc plates 26 contacts the side of the can and rolls with the relative displacement, so that the words "test product" on the marking tube 33 are coated on the side of the can, thereby marking the tested can, so as to facilitate the distinction between the tested cans and the untested cans, and the setting of the torsion spring 34 enables the marking tube 33 to return to the initial state after each test, so that it can be correctly coated each time, which is practical and convenient;

[0059] When conducting a pressure resistance test on some cans with smaller heights, when the cans extend into the area formed by the three groups of fixed arc plates 26, the upper end surface of the extended arc plate 4 is squeezed downward by the pressure plate 13 and moves and retracts toward the inside of the fixed arc plate 26, thereby cooperating with the fixing mechanism 2 to test the cans with smaller heights. In the process of the extended arc plate 4 moving downward, the extended arc plate 4 squeezes the first expansion membrane 5 at the bottom of the inner surface of the fixed arc plate 26, and the first expansion membrane 5 inhales air and sends the air to the second expansion membrane 52 through the elastic hose 51. The second expansion membrane 52 swells and fits tightly against the irregularly shaped side of the can, filling the gap between the can and the bottom of the fixed arc plate 26, thereby cooperating with the fixing mechanism 2 and the extended arc plate 4 to fix the cans with smaller heights and irregular shapes more firmly, and the second expansion membrane 52 in the expanded state is used to flexibly clamp and fix the cans, thereby reducing hard clamping wear.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure test device for cans, comprising a pressure tester (1), Features: A hydraulic cylinder (11) is fixedly connected to the center of the upper end surface of the pressure-resistant instrument (1), and a hydraulic rod (12) is fixedly connected to the bottom of the hydraulic cylinder (11). The lower end of the hydraulic rod (12) extends through the upper side of the inner surface of the pressure-resistant instrument (1) and is fixedly connected to a pressure plate (13). The pressure plate (13) is arranged in the pressure-resistant instrument (1) and is movably connected to the inner wall of the pressure-resistant instrument (1). The bottom of the pressure plate (13) is fixedly connected to a fixing mechanism (2). A marking component (3) and a first expansion membrane (5) are arranged inside the fixing mechanism (2), and an expansion arc plate (4) is movably connected to the upper end surface of the fixing mechanism (2). A placing table (6) is slidably connected to the bottom of the inner surface of the pressure-resistant instrument (1), and a clamping rod (7) is fixedly connected to the right end surface of the placing table (6); the fixing mechanism (2) comprises a fixing box (21), a motor (22), a rotating disk (23), a first arc groove ( 24), T-shaped slide bars (25), fixed arc plates (26), and second arc grooves (27); a motor (22) is fixedly connected to the bottom of the inner surface of the fixed box (21); the output shaft of the motor (22) is fixedly connected to the turntable (23); the upper end surface of the turntable (23) is provided with three groups of first arc grooves (24) distributed in an equidistant annular pattern; a group of T-shaped slide bars (25) is inserted into and slidably connected to each group of the first arc grooves (24); the upper end of each group of the T-shaped slide bars (25) extends through the first arc groove (24) and is fixedly connected to the bottom of the fixed arc plate (26); each group of the fixed arc plates (26) extends through a group of second arc grooves (27) and is slidably connected; the three groups of the second arc grooves (27) are arranged in an equidistant annular pattern on the upper end surface of the fixed box (21); a marking component (3) is arranged on the inner side surface of one group of the fixed arc plates (26); The marking assembly (3) comprises a marking bin (31), a connecting rod (32), a marking tube (33), and a torsion spring (34); the marking bin (31) is arranged at the center of the inner surface of a set of fixed arc plates (26); the connecting rod (32) is fixedly connected to the marking bin (31); the marking tube (33) is sleeved and fixed to the middle of the outer surface of the connecting rod (32); the outer surface of the connecting rod (32) is sleeved with the torsion spring (34) at both end regions of the marking tube (33); one end of the torsion spring (34) is fixed to the marking tube (33) and the other end is pressed against the inner wall of the marking bin (31); and the curved surface of the marking tube (33) is engraved with the reverse word "test product"; The lower end of the expansion arc plate (4) penetrates into the fixed arc plate (26) and is slidably connected, and one end of the expansion arc plate (4) extending into the fixed arc plate (26) is fixedly connected to a plurality of groups of first springs (41), and the lower end of each group of the first springs (41) is fixedly connected to the bottom of the inner surface of the fixed arc plate (26); The first expansion membrane (5) has two groups and is respectively fixedly connected to the bottom of the inner surface of the other two groups of fixed arc plates (26) without the marking assembly (3). The bottom of the first expansion membrane (5) is fixedly connected to an elastic hose (51). The right end of the elastic hose (51) penetrates through the fixed arc plate (26) and extends into the second expansion membrane (52). The second expansion membrane (52) is fixedly connected to the center of the inner surface of the other two groups of fixed arc plates (26) without the marking assembly (3). The right end face of the placing platform (6) is fixedly connected with a pull rod (61), and the right end of the pull rod (61) extends through and is slidably connected to the first opening (62), the first opening (62) is opened at a position where the right end face of the pressure-resistant instrument (1) corresponds to the right end face of the placing platform (6), the bottom of the pull rod (61) is fixedly connected with a slider (63), the slider (63) extends into and is slidably connected with a slide groove (64), and the slide groove (64) is opened at the bottom of the first opening (62); The clamping rod (7) extends through and is slidably connected to a slider (63); one end of the clamping rod (7) extending into the slider (63) is fixedly connected to a second spring (71); the upper end of the second spring (71) is fixedly connected to the upper side of the inner surface of the slider (63); the right side of the upper end surface of the clamping rod (7) is fixedly connected to a control rod (72); the control rod (72) extends through and is slidably connected to a second opening (73); the second opening (73) is provided on the right end surface of the slider (63); a clamping groove (74) is provided at the bottom of the right end of the slide groove (64); and the sizes of the clamping groove (74) and the clamping rod (7) match.

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