High-pressure leak detection machine for aerosol can

Abstract

The utility model discloses an aerosol can high-pressure leak detection machine, which comprises an aerosol can high-pressure leak detection machine body, the aerosol can high-pressure leak detection machine body comprises a base, a gas leak detector arranged on the base and two ring frames, and the inner sides of the ring frames are fixedly connected with three detection probes electrically connected with the gas leak detector. Universal wheels with locks are rotationally mounted at four corners of the bottom of the base. By arranging a series of structures, a plurality of detection probes can be conveniently and automatically driven to transversely move out, the transverse positions can be flexibly adjusted, a three-point transverse supporting effect can be integrally and automatically formed after the detection probes are moved out, and the phenomenon that the right side part inclines downwards or shakes unstably due to the fact that the ring frame and the detection probes are heavy is reduced; the use effect, the adjustment efficiency and the convenience are improved, the detection height can be conveniently, stably and vertically adjusted according to detection requirements, the multiple detection probes can be conveniently, rapidly and safely stored, surrounded and protected after detection or when the detection probes are not used, and the safety of the detection probes when the detection probes are not used is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aerosol can high-pressure leak detectors, in particular to an aerosol can high-pressure leak detector. Background Art

[0002] In the industrial field, since aerosol cans contain high-pressure gas, the aerosol cans have high requirements for sealing. In order to improve product quality and safety, it is necessary to ensure that the aerosol cans have no defects such as leakage (including liquid and gas leakage). However, in the production process of aerosol cans, due to the influence of machinery, equipment, materials or human factors, leakage will inevitably occur. Therefore, leak detection of aerosol cans is an indispensable link to ensure that there are no problems with the sealing of the bottles to avoid safety accidents caused by bottle leakage. Most traditional industrial aerosol can high-pressure leak detectors use soapy water for detection. Since the surface of the aerosol can is smooth, the soapy water slides off instantly and cannot detect the air pressure data of the leak point.

[0003] In this regard, a search by a new information search agency revealed that announcement number CN212844248U discloses an industrial aerosol can high-pressure leak detector, comprising a universal wheel, a base and a gas leak detector, the base is arranged above the universal wheel, a battery is arranged above the base, the gas leak detector is arranged above the battery, a push handle is arranged on one side of the gas leak detector, a slide bar 1 is arranged on one side above the push handle, a rotating tube is arranged in the middle of the slide bar 1, the base is connected to the universal wheel by screws, the battery is connected to the base by screws, the gas leak detector is connected to the battery by screws, the push handle is welded to the base, and the slide bar 1 passes through the rotating tube; the beneficial effect is that by setting up the gas leak detector, the aerosol can leak detection data can be counted, avoiding the instantaneous slip of the traditional soap water detection and the inability to detect the leak point pressure data, and meeting the use requirements of the industrial aerosol can high-pressure leak detector.

[0004] The above technology discloses an industrial aerosol can high-pressure leak detector, which realizes the aerosol can leak test through a gas leak detector and a detection probe, realizes the lifting and adjustment of the detection height through an electric lifting rod, and realizes the personnel to adjust the detection position laterally after loosening the locking bolt through the provided slide bar 1, slide bar 2 and locking bolt. However, there are still the following shortcomings when in use: 1. After detection or when not in use, multiple detection probes are directly exposed to the outside, and the risk of damage and contamination caused by accidental impact is high, and the detection probes cannot be conveniently and safely protected as a whole when not in use; 2. Manual unlocking is required to adjust the use position laterally, and after the horizontal adjustment, the single horizontal support of slide bar 2 is prone to the phenomenon that the right end position is tilted downward or shakes unsteadily due to the heavy part of the ring frame probe, and the adjustment efficiency and convenience are not ideal; in view of this, the present application proposes an aerosol can high-pressure leak detector to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an aerosol can high-pressure leak detector to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an aerosol can high-pressure leak detector, including an aerosol can high-pressure leak detector body, the aerosol can high-pressure leak detector body including a base, a gas leak detector arranged on the base and two ring frames, three detection probes electrically connected to the gas leak detectors are fixedly connected to the inner side of the ring frames, the four corners of the bottom of the base are rotatably mounted with universal wheels with locks, a battery is fixedly connected to the left side of the top of the base, and the gas leak detector is fixed and electrically connected to the top of the battery; wherein the aerosol can high-pressure leak detector body uses the detection probe to detect leaks on the side wall of the aerosol can, and the principle of displaying corresponding data through the gas leak detector when encountering a leak point area is the prior art, and this composition and technology have also been disclosed in the above-mentioned prior art CN212844248U, which is the same as it, and will not be further elaborated on;

[0007] A vertical guide lifting drive assembly is fixedly installed on the top of the base, a storage box with an opening on the right side is fixedly connected to the right side of the vertical guide lifting drive assembly, a sealing plate located at the lower right side of the storage box and matching with the storage box is fixedly installed on the right side of the top of the base, the ring frame and the detection probe are both located in the storage box, and the vertical guide lifting drive assembly is used to stabilize the vertical guide lifting and adjusting of the storage box, so as to realize flexible lifting and adjusting of the detection probe to the use height;

[0008] A same horizontal drive moving out adjustment component is fixedly connected between the adjacent side of the two ring frames and the left inner wall of the storage box. The horizontal drive moving out adjustment component is used to drive the two ring frames and the detection probe to move out and flexibly adjust the detection position laterally, and is used to drive the detection probe to be stored and protected in the storage box when not in use, and use the descending storage box and the sealing plate to form a fully enclosed safety protection state;

[0009] Rectangular grooves are provided on the top inner wall and the bottom inner wall of the storage box, and elastic double-stage cross-guide components are fixedly connected between the inner walls on both sides of the rectangular grooves. The adjacent sides of the two elastic double-stage cross-guide components are respectively fixedly connected to the repelling sides of the two ring frames. The elastic double-stage cross-guide components are used for double-stage cross-guide of the ring frames when they are moved out and moved laterally, so as to improve their stability in preventing them from falling and tilting when moving laterally.

[0010] Preferably, the vertical guide lifting drive assembly includes three vertical guide rods fixedly connected to the top of the base in the front-to-back direction at equal intervals, the three vertical guide rods are slidably sleeved with the same L-shaped lifting seat, a multi-stage electric push rod with an extended end fixedly connected to the inner wall of the top of the L-shaped lifting seat is embedded on the top of the base, and the right side of the L-shaped lifting seat is fixedly connected to the left side of the storage box.

[0011] Preferably, the transverse drive extension adjustment assembly includes a connecting seat fixedly connected between the two ring frames, and a multi-stage electric telescopic rod with an extended end fixedly connected to the left side of the connecting seat is fixedly installed on the left inner wall of the storage box.

[0012] Preferably, the elastic two-stage cross-guide assembly includes a cross-guide rod fixedly connected between the inner walls on both sides of the corresponding rectangular groove, a first slider is provided on the sliding sleeve of the cross-guide rod, a spring is fixedly connected between the left side of the first slider and the left inner wall of the corresponding rectangular groove, a T-shaped guide rod is fixedly connected to the right side of the first slider, a second slider is provided on the sliding sleeve of the T-shaped guide rod, and the adjacent sides of the two second sliders are respectively fixedly connected to the repelling sides of the two ring frames.

[0013] Preferably, the multi-stage electric push rod and the multi-stage electric telescopic rod are both electrically connected to a battery.

[0014] Preferably, the bottom of the L-shaped lifting seat is provided with three vertical guide holes which are respectively slidably fitted with the outer sides of the corresponding vertical guide rods.

[0015] Preferably, a U-shaped handle arranged obliquely is fixedly connected to the left side of the top of the base.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. This aerosol can high-pressure leak detector can automatically drive multiple detection probes to move out laterally and flexibly adjust the lateral position through the cooperation of the arranged base, the lateral drive adjustment component, the elastic two-stage lateral guide component, the ring frame and the detection probe, thereby improving the adjustment efficiency and convenience, and can automatically form a three-point lateral support effect after moving out. Compared with the single-point lateral support, it effectively improves the support effect of the ring frame, reduces the phenomenon of the right side part tilting or shaking instability due to the heavy ring frame and the detection probe, and improves the use effect;

[0018] 2. This aerosol can high-pressure leak detector can adjust the detection height vertically and stably according to the detection requirements through the cooperation of the vertical guide lifting drive component, storage box, horizontal drive removal adjustment component, ring frame and detection probe;

[0019] 3. This aerosol can high-pressure leak detector, through the cooperation of the storage box, the horizontal drive adjustment assembly, the vertical guide lifting drive assembly and the sealing plate, can conveniently and safely store and surround and protect multiple detection probes in one piece after detection or when not in use, thereby reducing the risk of accidental impact damage and contamination when not in use, and improving the safety of the detection probes when not in use.

[0020] The utility model is provided with a series of structures, which is convenient for automatically driving multiple detection probes to move out laterally and flexibly adjust the lateral positions, and can automatically form a three-point lateral support effect after moving out, thereby reducing the phenomenon that the right side part is tilted downward or shakes unsteadily due to the heavy ring frame and the detection probe part, improving the use effect, adjustment efficiency and convenience, facilitating the convenient and stable vertical adjustment of the detection height according to the detection requirements, and facilitating the convenient and safe storage, enclosure and protection of multiple detection probes after detection or when not in use, thereby improving the safety of the detection probes when not in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of an aerosol can high-pressure leak detector proposed by the utility model;

[0022] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of;

[0023] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A in the figure.

[0024] In the figure: 1. base; 2. gas leak detector; 201. detection probe; 3. ring frame; 4. battery; 5. multi-stage electric push rod; 6. vertical guide rod; 7. L-shaped lifting seat; 8. storage box; 9. multi-stage electric telescopic rod; 10. connecting seat; 11. rectangular groove; 12. horizontal guide rod; 13. first slider; 14. spring; 15. second slider; 16. T-shaped guide rod; 17. sealing plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figures 1 to 3As shown, an aerosol can high-pressure leak detector proposed in this embodiment includes an aerosol can high-pressure leak detector body, the aerosol can high-pressure leak detector body includes a base 1, a gas leak detector 2 and two ring frames 3 arranged on the base 1, three detection probes 201 electrically connected to the gas leak detector 2 are fixedly connected to the inner side of the ring frame 3, and universal wheels with locks are rotatably installed at the four corners of the bottom of the base 1, a battery is fixedly connected to the left side of the top of the base 1, the gas leak detector 2 is fixed and electrically connected to the top of the battery 4, and a U-shaped handle is fixedly connected to the left side of the top of the base 1. The principle that the aerosol can high-pressure leak detector body detects leaks on the side wall of the aerosol can by using the detection probe 201 and displays the corresponding data through the gas leak detector 2 when encountering an area with a leak point is a prior art. In addition, this composition and technology have also been disclosed in the above-mentioned prior art CN212844248U, which is the same as it and will not be further elaborated on.

[0027] A vertical guide lifting drive assembly is fixedly installed on the top of the base 1, and a storage box 8 with an opening on the right side is fixedly connected to the right side of the vertical guide lifting drive assembly. A sealing plate 17 located at the lower right side of the storage box 8 and matching with the storage box 8 is fixedly installed on the top right side of the base 1. The ring frame 3 and the detection probe 201 are both located in the storage box 8. The vertical guide lifting drive assembly is used to stabilize the vertical guide lifting adjustment of the storage box 8, so as to achieve flexible lifting and adjustment of the detection probe 201 for use height; the same horizontal drive removal adjustment assembly is fixedly connected between the adjacent side of the two ring frames 3 and the left inner wall of the storage box 8, and the horizontal drive removal adjustment assembly is used to drive the two ring frames 3 to move vertically and adjust the height. The ring frame 3 and the detection probe 201 are moved out and their detection position can be flexibly adjusted laterally, and the detection probe 201 is driven to be stored and protected in the storage box 8 when not in use, and the descending storage box 8 and the sealing plate 17 are used to form a fully enclosed safety protection state; rectangular grooves 11 are provided on the top inner wall and the bottom inner wall of the storage box 8, and elastic double-stage cross-guide components are fixedly connected between the inner walls on both sides of the rectangular groove 11, and the adjacent sides of the two elastic double-stage cross-guide components are respectively fixedly connected to the repelling sides of the two ring frames 3, and the elastic double-stage cross-guide components are used for double-stage cross-guide of the ring frame 3 when it is moved out and moved laterally, so as to improve its lateral movement anti-falling stability.

[0028] Specifically, the vertical guide lifting drive assembly includes three vertical guide rods 6 fixedly connected to the top of the base 1 in the front-to-back direction at equal intervals, and the same L-shaped lifting seat 7 is slidably sleeved on the three vertical guide rods 6, wherein the bottom of the L-shaped lifting seat 7 is provided with three vertical guide holes respectively slidably sleeved with the outer sides of the corresponding vertical guide rods 6, and the vertical guide rods 6 are used to guide the L-shaped lifting seat 7 to slide vertically through the corresponding vertical guide holes, and the top of the base 1 is embedded and fixed with a multi-stage electric push rod 5 with an extended end fixedly connected to the inner wall of the top of the L-shaped lifting seat 7, wherein the top of the base 1 is provided with an embedded hole, and the multi-stage electric push rod 5 Located in the embedding hole and not in contact with the inner wall of the embedding hole, the bottom of the multi-stage electric push rod 5 is fixedly connected with a mounting seat, and the mounting seat is threadedly fixed to the bottom of the base 1. The multi-stage electric push rod 5 is embedded and fixed with the base 1 through the embedding hole and the mounting seat, and the right side of the L-shaped lifting seat 7 is fixedly connected to the left side of the storage box 8; the vertical guide rod 6, the L-shaped lifting seat 7 and the multi-stage electric push rod 5 are coordinated, and the multi-stage electric push rod 5 is used to drive the L-shaped lifting seat 7 to rise and fall, and the vertical guide rod 6 is used to vertically guide the L-shaped lifting seat 7, so as to further drive the storage box 8 to stabilize the vertical guide lifting adjustment.

[0029] Furthermore, the transverse drive extension adjustment component includes a connecting seat 10 fixedly connected between the two ring frames 3, and a multi-stage electric telescopic rod 9 whose protruding end is fixedly connected to the left side of the connecting seat 10 is fixedly installed on the left inner wall of the storage box 8. The multi-stage electric push rod 5 and the multi-stage electric telescopic rod 9 are both electrically connected to the battery 4, which has the effect of supplying power to the multi-stage electric push rod 5 and the multi-stage electric telescopic rod 9; the set connecting seat 10 and the multi-stage electric telescopic rod 9 cooperate, and the multi-stage electric telescopic rod 9 is used to drive the connecting seat 10 to move horizontally to the right and left, and the connecting seat 10 is used to drive the two ring frames 3 and the detection probe 201 to move horizontally out and flexibly adjust the use position horizontally.

[0030] Furthermore, the elastic two-stage cross-guide assembly includes a cross-guide rod 12 fixedly connected between the inner walls on both sides of the corresponding rectangular groove 11, a first slider 13 is slidably sleeved on the cross-guide rod 12, wherein the right side of the first slider 13 is provided with a cross-guide hole that is slidably sleeved with the outer side of the corresponding cross-guide rod 12, which plays the effect of guiding the transverse sliding of the first slider 13, a spring 14 is fixedly connected between the left side of the first slider 13 and the left inner wall of the corresponding rectangular groove 11, a T-shaped guide rod 16 is fixedly connected to the right side of the first slider 13, a second slider 15 is slidably sleeved on the T-shaped guide rod 16, wherein the right side of the second slider 15 is provided with a guide through hole that is slidably sleeved with the outer side of the corresponding T-shaped guide rod 16, which plays the effect of guiding the transverse sliding of the second slider 15, and the two second sliders 15 are close to each other. One side is fixedly connected with the repelling side of the two ring frames 3 respectively; the transverse guide rod 12, the first slider 13, the spring 14, the T-shaped guide rod 16 and the second slider 15 are matched, and when the ring frame 3 moves to the right, the corresponding second slider 15 is driven to slide horizontally on the T-shaped guide rod 16, and when the second slider 15 slides to contact the right inner wall of the corresponding T-shaped guide rod 16, it is squeezed and driven to move to the right, and at this time, the T-shaped guide rod 16 drives the corresponding first slider 13 to slide rightward on the transverse guide rod 12, and stretches the spring 14, and the second slider 15 is used to slide on the T-shaped guide rod 16 and the first slider 13 on the transverse guide rod 12 in sequence, so as to achieve the effect of bipolar transverse guidance, and when the spring 14 is stretched to facilitate the rear seat to move to the left, its elastic force is used to drive the T-shaped guide rod 16 to be collected into the storage box 8 through the first slider 13.

[0031] The method of using this embodiment is as follows: when it is necessary to move out and laterally adjust the detection position of the detection probe 201 for the aerosol can, the multi-stage electric telescopic rod 9 is started in the positive direction to drive the connecting seat 10 to move laterally to the right, and the connecting seat 10 drives the two ring frames 3 and the detection probe 201 to move out laterally to the right, and continues to move to the right after moving out to flexibly adjust the use position laterally, wherein when the ring frame 3 moves to the right, it drives the corresponding second slider 15 to slide laterally on the T-shaped guide rod 16, and when the second slider 15 slides to contact the right inner wall of the corresponding T-shaped guide rod 16, it is squeezed and driven to move to the right, and at this time, the T-shaped guide rod 16 moves to the right and drives the corresponding first slider 13 to slide to the right on the transverse guide rod 12 The first slider 13 stretches the corresponding spring 14, and the second slider 15 slides on the T-shaped guide rod 16 and the first slider 13 slides on the transverse guide rod 12 in sequence to achieve the effect of bipolar transverse guidance, and the transverse support achieved by the bipolar transverse guides at the upper and lower parts cooperates with the transverse support achieved by the multi-stage electric telescopic rod 9 in the middle to achieve a three-point transverse support effect. Compared with the single-point transverse support, the support effect of the ring frame 3 is effectively improved, and the phenomenon of the right side part tilting or shaking due to the heavy parts of the ring frame 3 and the detection probe 201 is reduced, thereby improving the use effect, and the automatic drive to remove and adjust it laterally is used to improve the adjustment efficiency and convenience;

[0032] When it is necessary to lift and adjust the detection height, the multi-stage electric push rod 5 is started forward to drive the L-shaped lifting seat 7 to slide upward on the three vertical guide rods 6, and the vertical guide rods 6 are used to guide the L-shaped lifting seat 7 stably and vertically. The L-shaped lifting seat 7 drives the storage box 8 to move upward stably and vertically, and the storage box 8 drives the detection probe 201 to move upward and adjust in turn through the multi-stage electric telescopic rod 9, the connecting seat 10 and the ring frame 3, so as to achieve the effect of convenient and stable vertical adjustment of the detection height; in the leak picking work, the aerosol can high-pressure leak detector body uses the detection probe 201 to detect leaks on the side wall of the aerosol can, and when encountering a leak point area, the gas leak detector 2 displays the corresponding data. The principle is the prior art. In addition, this composition and technology have also been disclosed in the above-mentioned prior art CN212844248U, which is the same as it, and will not be elaborated on it separately;

[0033] After use or when not in use, first reversely start the multi-stage electric telescopic rod 9 to drive the ring frame 3 and the detection probe 201 to move back to the left and be stored in the storage box 8 through the connecting seat 10, and the ring frame 3 drives the corresponding second slider 15 to relax the squeezing force on the T-shaped guide rod 16 to the left. At this time, the elastic force of the spring 14 in the stretched state drives the T-shaped guide rod 16 to move back to the left and be stored in the storage box 8 through the corresponding first slider 13, and then reversely start the multi-stage electric push rod 5 to drive the storage box 8 to move downward through the L-shaped lifting seat 7. The storage box 8 moves downward to the left side of the sealing plate 17. At this time, the sealing plate 17 and the storage box 8 are used to fully surround and store the detection probe 201, so as to achieve the effect of convenient and safe protection of multiple detection probes 201 after detection or when not in use, reduce the risk of accidental impact damage and contamination when not in use, and improve the safety of the detection probe 201 when not in use.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An aerosol can high-pressure leak detector, comprising an aerosol can high-pressure leak detector body, the aerosol can high-pressure leak detector body comprising a base (1), a gas leak detector (2) arranged on the base (1) and two ring frames (3), the inner side of the ring frame (3) is fixedly connected with three detection probes (201) which are electrically connected to the gas leak detector (2), characterized in that: The four corners of the bottom of the base (1) are all rotatably mounted with universal wheels with locks, a storage battery is fixedly connected to the left side of the top of the base (1), and the gas leak detector (2) is fixed and electrically connected to the top of the storage battery (4); A vertical guide lifting drive assembly is fixedly mounted on the top of the base (1); a storage box (8) with an opening on the right side is fixedly connected to the right side of the vertical guide lifting drive assembly; a sealing plate (17) located at the lower right side of the storage box (8) and matching with the storage box (8) is fixedly mounted on the right side of the top of the base (1); and the ring frame (3) and the detection probe (201) are both located in the storage box (8); A same horizontal drive moving out adjustment component is fixedly connected between the adjacent sides of the two ring frames (3) and the left inner wall of the storage box (8); A rectangular groove (11) is provided on the top inner wall and the bottom inner wall of the storage box (8), and an elastic double-stage cross-guiding component is fixedly connected between the inner walls on both sides of the rectangular groove (11), and the adjacent sides of the two elastic double-stage cross-guiding components are respectively fixedly connected to the repelling sides of the two ring frames (3).

2. The aerosol can high pressure leak detector according to claim 1, characterized in that: The vertical guide lifting drive assembly comprises three vertical guide rods (6) fixedly connected to the top of the base (1) in the front-to-back direction at equal intervals, the three vertical guide rods (6) being slidably sleeved with the same L-shaped lifting seat (7), a multi-stage electric push rod (5) having an extended end fixedly connected to the inner wall of the top of the L-shaped lifting seat (7) being embedded and fixed on the top of the base (1), and the right side of the L-shaped lifting seat (7) being fixedly connected to the left side of the storage box (8).

3. The aerosol can high pressure leak detector according to claim 2, characterized in that: The transverse drive extension adjustment assembly comprises a connecting seat (10) fixedly connected between the two ring frames (3), and a multi-stage electric telescopic rod (9) is fixedly mounted on the left inner wall of the storage box (8), the protruding end of which is fixedly connected to the left side of the connecting seat (10).

4. The aerosol can high pressure leak detector according to claim 3, characterized in that: The elastic double-stage cross-guide assembly comprises a cross-guide rod (12) fixedly connected between the inner walls of both sides of the corresponding rectangular groove (11); a first slider (13) is slidably sleeved on the cross-guide rod (12); a spring (14) is fixedly connected between the left side of the first slider (13) and the left inner wall of the corresponding rectangular groove (11); a T-shaped guide rod (16) is fixedly connected to the right side of the first slider (13); a second slider (15) is slidably sleeved on the T-shaped guide rod (16); and adjacent sides of the two second sliders (15) are respectively fixedly connected to the repelling sides of the two ring frames (3).

5. The aerosol can high pressure leak detector according to claim 2, characterized in that: The multi-stage electric push rod (5) and the multi-stage electric telescopic rod (9) are both electrically connected to the battery (4).

6. The aerosol can high pressure leak detector according to claim 2, characterized in that: The bottom of the L-shaped lifting seat (7) is provided with three vertical guide holes which are respectively slidably mounted on the outer sides of the corresponding vertical guide rods (6).

7. The aerosol can high pressure leak detector according to claim 1, characterized in that: A U-shaped handle arranged obliquely is fixedly connected to the left side of the top of the base (1).

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