A liquid medicine receiving device that is easy to clean

Abstract

The utility model provides a medicine liquid receiving device which is easy to clean, relates to the technical field of medicine liquid receiving devices, and comprises a medicine liquid receiving tank, a medicine liquid inlet pipe, an infusion hole, a first waterproof solenoid valve, an annular spray structure, a second waterproof solenoid valve and a controller; the device controls the opening and closing conditions of the first waterproof solenoid valve and the second waterproof solenoid valve through the controller, when the first waterproof solenoid valve is opened and the second waterproof solenoid valve is closed, the infusion hole on the medicine liquid inlet pipe is used for filling the medicine liquid; when the first waterproof solenoid valve is closed and the second waterproof solenoid valve is opened, the annular spray structure is used for spray cleaning of the inner wall of the medicine liquid receiving tank, the filling and spray pipelines are integrated together, and the filling and spray cleaning can be controlled separately, so as to realize uniform spray cleaning of the inner wall of the medicine liquid storage tank from top to bottom, and it is not easy to generate foam when filling from the bottom.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid medicine receiving devices, in particular to a liquid medicine receiving device which is easy to clean. Background Art

[0002] At present, liquid medicine receiving tanks are mainly used to temporarily store liquid medicine, and the liquid medicine is taken out from the liquid medicine storage tank for further processing at an appropriate time. Some existing liquid medicine storage tanks are provided with a water spray pipe at the upper end to spray and clean the inner wall from top to bottom, and the liquid medicine enters by opening the upper cover; in other existing technologies, the liquid medicine storage tank is filled with liquid medicine and sprayed with cleaning fluid from bottom to top through a pipeline located at the lower end of the inner cavity.

[0003] In the first prior art, the filling and spraying pipelines are separately arranged, and foam is easily generated when the liquid medicine is filled; in the second prior art, although the filling and spraying pipelines are integrated together, the spraying direction is from bottom to top, and the spraying direction is single, and the cleaning effect on the inner wall of the liquid medicine storage tank is limited. Utility Model Content

[0004] The utility model aims to provide a medicine liquid receiving device which is easy to clean. The device controls the opening and closing of a first waterproof solenoid valve and a second waterproof solenoid valve through a controller. When the first waterproof solenoid valve is opened and the second waterproof solenoid valve is closed, the infusion hole on the medicine liquid inlet tube is used for filling the medicine liquid; when the first waterproof solenoid valve is closed and the second waterproof solenoid valve is opened, the annular spray structure is used for spray cleaning of the inner wall of the medicine liquid receiving tank. The filling and spray pipelines are integrated together, and the filling and spray cleaning can be controlled separately, so as to realize uniform spray cleaning of the inner wall of the medicine liquid storage tank from top to bottom, and filling from the bottom is not easy to generate foam.

[0005] The utility model provides a liquid medicine receiving device which is easy to clean, comprising a liquid medicine receiving tank,

[0006] The liquid medicine inlet pipe has an output end which is attached to the inner wall of the liquid medicine receiving tank;

[0007] The input end of the medicine inlet tube is sealed, and the lower side of the output end of the medicine inlet tube is evenly provided with infusion holes;

[0008] A first waterproof solenoid valve, which is fixedly mounted on the middle part of the liquid medicine inlet and outlet ends;

[0009] An annular spray structure, which is fixedly mounted on the upper end of the inner cavity of the liquid medicine receiving tank, and the annular spray structure sprays downward;

[0010] The input end of the annular spray structure is fixedly connected to the upper side of the outer wall of the output end of the liquid medicine inlet pipe, and a second waterproof solenoid valve is fixedly mounted on the input end of the annular spray structure;

[0011] A controller, which is electrically connected to the first waterproof solenoid valve and the second waterproof solenoid valve respectively;

[0012] When the first waterproof solenoid valve is opened and the second waterproof solenoid valve is closed, the infusion hole on the liquid medicine inlet tube is used for filling the liquid medicine;

[0013] When the first waterproof solenoid valve is closed and the second waterproof solenoid valve is opened, the annular spray structure is used for spraying and cleaning the inner wall of the medicine receiving tank.

[0014] As a further optimization scheme, in order to facilitate the spray cleaning of the inner wall of the liquid medicine receiving tank, the annular spray structure includes:

[0015] An annular pipe is fixedly assembled at the upper end of the inner cavity of the liquid medicine receiving tank through a support rod;

[0016] The outer wall of the annular pipeline is fixedly connected with a connecting pipe, and the connecting pipe is the input end of the annular spray structure;

[0017] The bottom surface of the annular pipeline is evenly and fixedly connected with a first spray head.

[0018] As a further optimization scheme, in order to facilitate the spray cleaning of the top surface of the inner cavity of the liquid medicine receiving tank, the left and right sides of the inner wall of the annular pipe are fixedly connected with auxiliary spray structures, and the auxiliary spray structures include:

[0019] Longitudinal pipeline;

[0020] The left and right sides of the inner wall of the annular pipeline are both longitudinally fixedly connected with longitudinal pipelines, and the upper surface of the longitudinal pipeline is evenly fixedly connected with a second spray head.

[0021] As a further optimization scheme, in order to facilitate the supply of liquid medicine or cleaning water, the input end of the liquid medicine inlet pipe is fixedly connected to the output end of the water pump, and the input end of the water pump is fixedly connected to the liquid inlet pipe.

[0022] As a further optimization scheme, in order to heat the pipeline body so that the clean water retained on its inner wall can be dried quickly and put into liquid medicine filling and use more quickly, the liquid medicine inlet pipe includes:

[0023] The pipe body has a heating wire coiled on its outer wall, and the heating wire is connected to an external power supply. The pipe body is externally connected with a heat insulating sleeve, and the heating wire is located between the outer wall of the pipe body and the inner wall of the heat insulating sleeve.

[0024] As a further optimization scheme, in order to perform regular stirring to prevent the stored liquid medicine from sinking to the bottom, a stirring structure is also included, and the stirring structure includes:

[0025] A driving motor is fixedly mounted on the middle of the upper surface of the medicine liquid receiving tank, and the lower end of the rotating shaft of the driving motor passes through the top surface of the medicine liquid receiving tank;

[0026] A round rod, the upper end of which is fixedly connected to the lower end of the rotating shaft of the driving motor through a coupling, and the lower end of the round rod extends to the lower end of the inner cavity of the liquid medicine receiving tank;

[0027] The outer wall of the round rod is evenly and fixedly equipped with stirring blades.

[0028] As a further optimization solution, in order to receive and store the liquid medicine, the liquid medicine receiving tank includes:

[0029] Splicing tanks;

[0030] An exhaust pipe, which is fixedly connected to the upper end of the spliced ​​tank body;

[0031] A drain pipe with a valve, which is fixedly connected to the middle of the bottom surface of the spliced ​​tank body;

[0032] Support legs are evenly and fixedly mounted on the edges of the bottom surfaces of the spliced ​​tank bodies.

[0033] As a further optimization solution, in order to facilitate the splitting of the spliced ​​tank into two parts, the spliced ​​tank includes:

[0034] Lower barrel;

[0035] The lower end of the upper round cover is screwed to the upper end of the lower barrel body.

[0036] As a further optimization scheme, in order to facilitate the observation of the liquid level inside the medicine receiving tank, a liquid level observation window is installed on the upper end of the outer wall of the upper round cover. The liquid level observation window includes an observation window opened on the upper end of the outer wall of the upper round cover, and the inner wall of the observation window is fixedly equipped with transparent tempered glass.

[0037] As a further optimization scheme, in order to limit the position of the input end of the medicine inlet pipe and avoid chaotic distribution, the outer wall of the medicine receiving tank is evenly and longitudinally fixedly equipped with a limiting sleeve, and the input end of the medicine inlet pipe passes through the inner annular surface of the limiting sleeve.

[0038] The utility model provides a liquid medicine receiving device that is easy to clean through improvement. Compared with the prior art, it has the following improvements and advantages:

[0039] Firstly, the device controls the opening and closing of the first waterproof solenoid valve and the second waterproof solenoid valve through a controller. When the first waterproof solenoid valve is opened and the second waterproof solenoid valve is closed, the infusion hole on the medicine inlet tube is used for filling the medicine; when the first waterproof solenoid valve is closed and the second waterproof solenoid valve is opened, the annular spray structure is used for spray cleaning of the inner wall of the medicine receiving tank. The filling and spray pipelines are integrated together, and the filling and spray cleaning can be controlled separately, so as to realize uniform spray cleaning of the inner wall of the medicine storage tank from top to bottom, and filling from the bottom is not easy to generate foam.

[0040] Secondly, in order to perform regular stirring to prevent the stored liquid medicine from sinking to the bottom, the device also includes a stirring structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic diagram of the structure of the utility model;

[0043] Figure 2 It is the annular spray structure and structural schematic diagram of the utility model;

[0044] Figure 3 This is a schematic diagram of the medicine liquid inlet pipe structure of the utility model;

[0045] Figure 4 It is a schematic diagram of the stirring structure and liquid level observation window structure of the utility model.

[0046] Description of reference numerals:

[0047] 1-first waterproof solenoid valve, 2-medicine receiving tank, 21-joined tank body, 211-lower barrel body, 212-upper round cover, 22-exhaust pipe, 23-discharge pipe with valve, 3-medicine inlet pipe, 31-pipeline body, 32-heating wire, 33-insulating sleeve, 4-infusion hole, 5-annular spray structure, 51-annular pipeline, 52-connecting pipe, 53-first spray head, 6-second waterproof solenoid valve, 7-controller, 8-water pump, 9-limiting sleeve, 10-stirring structure, 101-drive motor, 102-round rod, 103-stirring blade, 11-liquid level observation window, 12-auxiliary spray structure, 121-longitudinal pipeline, 122-second spray head. DETAILED DESCRIPTION

[0048] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0049] 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 indicating directions or positional relationships are based on the directions 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 device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0050] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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 utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] See also Figure 1-4 The utility model provides a technical solution: a liquid medicine receiving device that is easy to clean, comprising a liquid medicine receiving tank 2,

[0052] The liquid medicine inlet pipe 3 has its output end attached to the inner wall of the liquid medicine receiving tank 2 to avoid occupying the internal space of the liquid medicine receiving tank 2;

[0053] The input end of the medicine inlet tube 3 is sealed, and the lower side of the output end of the medicine inlet tube 3 is evenly provided with infusion holes 4, and the medicine is discharged into the medicine receiving tank 2 from the infusion holes 4. The infusion holes 4 are evenly distributed in multiples and have appropriate sizes, so that a large pressure will not be generated when the medicine is discharged, thereby avoiding the generation of foam due to the injection of the medicine;

[0054] A first waterproof solenoid valve 1, which is fixedly mounted on the middle of the output end of the liquid medicine inlet pipe 3;

[0055] The annular spray structure 5 is fixedly mounted on the upper end of the inner cavity of the liquid medicine receiving tank 2, and the annular spray structure 5 sprays downward;

[0056] The input end of the annular spray structure 5 is fixedly connected to the upper side of the outer wall of the output end of the liquid medicine inlet pipe 3, and a second waterproof solenoid valve 6 is fixedly mounted on the input end of the annular spray structure 5;

[0057] A controller 7, which is electrically connected to the first waterproof solenoid valve 1 and the second waterproof solenoid valve 6, respectively. The controller 7 is used to control whether the first waterproof solenoid valve 1 and the second waterproof solenoid valve 6 are opened or not. The first waterproof solenoid valve 1 and the second waterproof solenoid valve 6 both have waterproof performance to meet the use requirements of the liquid medicine;

[0058] When the first waterproof solenoid valve 1 is opened and the second waterproof solenoid valve 6 is closed, the infusion hole 4 on the liquid medicine inlet tube 3 is used for filling the liquid medicine;

[0059] When the first waterproof electromagnetic valve 1 is closed and the second waterproof electromagnetic valve 6 is opened, the annular spray structure 5 is used for spraying and cleaning the inner wall of the liquid medicine receiving tank.

[0060] In some embodiments, in order to facilitate spray cleaning of the inner wall of the liquid medicine receiving tank 2, the annular spray structure 5 includes:

[0061] The annular pipe 51 is fixedly mounted on the upper end of the inner cavity of the liquid medicine receiving tank 2 by means of a support rod;

[0062] The outer wall of the annular pipe 51 is fixedly connected with a connecting pipe 52, and the connecting pipe 52 is the input end of the annular spray structure 5;

[0063] The bottom surface of the annular pipe 51 is evenly fixedly connected with a first spray head 53 ; after the liquid medicine is supplied into the annular pipe 51 , it is sprayed evenly from top to bottom on the inner wall of the liquid medicine receiving tank 2 from the first spray head 53 to clean the inner wall of the liquid medicine receiving tank 2 .

[0064] In some embodiments, in order to facilitate spray cleaning of the inner cavity top surface of the liquid medicine receiving tank 2, the inner wall of the annular pipe 51 is fixedly connected to the left and right sides with auxiliary spray structures 12, and the auxiliary spray structure 12 includes:

[0065] Longitudinal pipeline 121;

[0066] The left and right sides of the inner wall of the annular pipe 51 are longitudinally fixedly connected with a longitudinal pipe 121, and the upper surface of the longitudinal pipe 121 is evenly fixedly connected with a second spray head 122. The medicine enters the longitudinal pipe 121 from the annular pipe 51, and is finally sprayed upward from the second spray head 122, spraying on the top surface of the inner cavity of the medicine receiving tank 2, thereby cleaning the top surface of the inner cavity of the medicine receiving tank 2. This cleaning process is carried out simultaneously with the spray cleaning of the first spray head 53.

[0067] In some embodiments, in order to facilitate the supply of liquid medicine or cleaning water, the input end of the liquid medicine inlet pipe 3 is fixedly connected to the output end of the water pump 8, and the input end of the water pump 8 is fixedly connected to the liquid inlet pipe.

[0068] In some embodiments, in order to heat the pipe body 31 so that the clean water retained on its inner wall can be dried quickly and put into liquid medicine filling and use more quickly, the liquid medicine inlet pipe 3 includes:

[0069] The pipe body 31 has a heating wire 32 wound around its outer wall, and the heating wire 32 is connected to an external power supply. The pipe body 31 is covered with an insulating sleeve 33, and the heating wire 32 is located between the outer wall of the pipe body 31 and the inner wall of the insulating sleeve 33. The heating wire 32 is energized to generate heat to heat the pipe body 31, thereby accelerating the drying of residual moisture on its inner wall. The insulating sleeve 33 is used to isolate the heat of the heating wire 32 to avoid scalding the staff. The heating wire 32 can be electrically connected to the controller 7, and the controller 7 is used to control whether the heating wire 32 is working.

[0070] Similarly, heating elements may be evenly arranged on the medicine liquid receiving tank 2 to accelerate the drying of residual water on the inner wall of the medicine liquid receiving tank 2 so that it can be put into medicine liquid filling and use more quickly.

[0071] In some embodiments, in order to perform regular stirring to prevent the stored liquid medicine from sinking to the bottom, a stirring structure 10 is also included. The stirring structure 10 includes:

[0072] The driving motor 101 is fixedly mounted on the middle of the upper surface of the liquid medicine receiving tank 2, and the lower end of the rotating shaft of the driving motor 101 passes through the top surface of the liquid medicine receiving tank 2;

[0073] The round rod 102, the upper end of which is fixedly connected to the lower end of the rotating shaft of the driving motor 101 through a coupling, and the lower end of the round rod 102 extends to the lower end of the inner cavity of the liquid medicine receiving tank 2;

[0074] The outer wall of the round rod 102 is evenly fixed with stirring blades 103; the driving motor 101 is connected to an external power source, and the driving motor 101 drives the round rod 102 and the stirring blades 103 to rotate.

[0075] In some embodiments, in order to receive and store the medical liquid, the medical liquid receiving tank 2 includes:

[0076] Splicing tank 21;

[0077] An exhaust pipe 22, which is fixedly connected to the upper end of the spliced ​​tank body 21 and is used to discharge the gas generated when and in the liquid;

[0078] The valved drain pipe 23 is fixedly connected to the middle of the bottom surface of the spliced ​​tank body 21; the valve on the valved drain pipe 23 can be opened to discharge the waste water used for cleaning the spliced ​​tank body 21, and is also used for discharging the temporarily stored liquid medicine;

[0079] Support legs are evenly and fixedly mounted on the bottom edge of the spliced ​​tank body 21 .

[0080] In some embodiments, in order to facilitate the splitting of the spliced ​​tank body 21 into two parts, the spliced ​​tank body 21 includes:

[0081] Lower barrel 211;

[0082] The lower end of the upper round cover 212 is screwed to the upper end of the lower barrel body 211 .

[0083] In some embodiments, in order to facilitate observation of the liquid level inside the medicine receiving tank 2, a liquid level observation window 11 is installed on the upper end of the outer wall of the upper circular cover 212. The liquid level observation window 11 includes an observation window opened on the upper end of the outer wall of the upper circular cover 212, and the inner wall of the observation window is fixedly equipped with transparent tempered glass.

[0084] In some embodiments, in order to limit the position of the input end of the liquid medicine inlet pipe 3 and avoid its chaotic distribution, the outer wall of the liquid medicine receiving tank 2 is evenly and longitudinally fixedly assembled with a limiting sleeve 9, and the input end of the liquid medicine inlet pipe 3 passes through the inner annular surface of the limiting sleeve 9.

[0085] Working principle:

[0086] The opening and closing conditions of the first waterproof solenoid valve 1 and the second waterproof solenoid valve 6 are controlled by the controller 7. When the first waterproof solenoid valve 1 is opened and the second waterproof solenoid valve 6 is closed, the infusion hole 4 on the medicine inlet tube 3 is used for filling the medicine; when the first waterproof solenoid valve 1 is closed and the second waterproof solenoid valve 6 is opened, the annular spray structure 5 is used for spray cleaning of the inner wall of the medicine receiving tank 2. The filling and spray pipelines are integrated together, and the filling and spray cleaning can be controlled separately, so as to realize uniform spray cleaning of the inner wall of the medicine storage tank 2 from top to bottom, and filling from the bottom is not easy to generate foam.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A liquid medicine receiving device that is easy to clean, comprising a liquid medicine receiving tank, characterized in that: The liquid medicine inlet pipe has an output end which is attached to the inner wall of the liquid medicine receiving tank; The input end of the medicine inlet tube is sealed, and the lower side of the output end of the medicine inlet tube is evenly provided with infusion holes; A first waterproof solenoid valve, which is fixedly mounted on the middle part of the liquid medicine inlet and outlet ends; An annular spray structure, which is fixedly mounted on the upper end of the inner cavity of the liquid medicine receiving tank, and the annular spray structure sprays downward; The input end of the annular spray structure is fixedly connected to the upper side of the outer wall of the output end of the liquid medicine inlet pipe, and a second waterproof solenoid valve is fixedly mounted on the input end of the annular spray structure; A controller, which is electrically connected to the first waterproof solenoid valve and the second waterproof solenoid valve respectively; When the first waterproof solenoid valve is opened and the second waterproof solenoid valve is closed, the infusion hole on the liquid medicine inlet tube is used for filling the liquid medicine; When the first waterproof solenoid valve is closed and the second waterproof solenoid valve is opened, the annular spray structure is used for spraying and cleaning the inner wall of the medicine receiving tank.

2. A liquid medicine receiving device that is easy to clean according to claim 1, characterized in that: The annular spray structure comprises: An annular pipe is fixedly assembled at the upper end of the inner cavity of the liquid medicine receiving tank through a support rod; The outer wall of the annular pipeline is fixedly connected with a connecting pipe, and the connecting pipe is the input end of the annular spray structure; The bottom surface of the annular pipeline is evenly and fixedly connected with a first spray head.

3. The easy-to-clean liquid medicine receiving device according to claim 2, characterized in that: The left and right sides of the inner wall of the annular pipe are fixedly connected with auxiliary spray structures, and the auxiliary spray structures include: Longitudinal pipeline; The left and right sides of the inner wall of the annular pipeline are both longitudinally fixedly connected with longitudinal pipelines, and the upper surface of the longitudinal pipeline is evenly fixedly connected with a second spray head.

4. The easy-to-clean liquid medicine receiving device according to claim 1, characterized in that: The input end of the liquid medicine inlet pipe is fixedly connected to the output end of the water pump, and the input end of the water pump is fixedly connected to the liquid inlet pipe.

5. The easy-to-clean liquid medicine receiving device according to claim 1, characterized in that: The liquid medicine inlet pipe comprises: The pipe body has a heating wire coiled on its outer wall, and the heating wire is connected to an external power supply. The pipe body is externally connected with a heat insulating sleeve, and the heating wire is located between the outer wall of the pipe body and the inner wall of the heat insulating sleeve.

6. The easy-to-clean liquid medicine receiving device according to claim 1, characterized in that: Also included is a stirring structure, the stirring structure comprising: A driving motor is fixedly mounted on the middle of the upper surface of the medicine liquid receiving tank, and the lower end of the rotating shaft of the driving motor passes through the top surface of the medicine liquid receiving tank; A round rod, the upper end of which is fixedly connected to the lower end of the rotating shaft of the driving motor through a coupling, and the lower end of the round rod extends to the lower end of the inner cavity of the liquid medicine receiving tank; The outer wall of the round rod is evenly and fixedly equipped with stirring blades.

7. The easy-to-clean liquid medicine receiving device according to claim 1, characterized in that: The liquid medicine receiving tank comprises: Splicing tanks; An exhaust pipe, which is fixedly connected to the upper end of the spliced ​​tank body; A drain pipe with a valve, which is fixedly connected to the middle of the bottom surface of the spliced ​​tank body; Support legs are evenly and fixedly mounted on the edges of the bottom surfaces of the spliced ​​tank bodies.

8. The easy-to-clean liquid medicine receiving device according to claim 7, characterized in that: The spliced ​​tank body comprises: Lower barrel; The lower end of the upper round cover is screwed to the upper end of the lower barrel body.

9. The easy-to-clean liquid medicine receiving device according to claim 8, characterized in that: A liquid level observation window is mounted on the upper end of the outer wall of the upper circular cover. The liquid level observation window comprises an observation window opened on the upper end of the outer wall of the upper circular cover. The inner wall of the observation window is fixedly mounted with transparent tempered glass.

10. The easy-to-clean liquid medicine receiving device according to claim 1, characterized in that: The outer wall of the medicine liquid receiving tank is evenly and longitudinally fixedly equipped with a limiting sleeve, and the input end of the medicine liquid inlet pipe passes through the inner annular surface of the limiting sleeve.

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