CN214186053U

CN214186053U - Rotary over-force protection device and bottle cap screwing device

Info

Publication number: CN214186053U
Application number: CN202023036751.9U
Authority: CN
Inventors: 宛艳辉; 张建; 卢垣宇; 毕有东
Original assignee: Chengdu Sailian Technology Co ltd
Current assignee: Chengdu Sailian Technology Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-09-14
Anticipated expiration: 2030-12-15

Abstract

The utility model relates to a bottle lid revolves technical field, discloses a rotatory overforce protection device and bottle lid revolve revolves device, including rotary drive device, first connector and second connector, rotary drive device drive first connector rotates, and first connector includes the adapter sleeve, and the second connector includes and realizes rotating spacing dish and setting up the connecting rod on spacing dish with the cooperation of the external thread way on the lid, and circumference is equipped with a plurality of butt terminal surfaces on the connecting rod, and the connecting rod is installed in the adapter sleeve, is equipped with first elastic pin on the adapter sleeve, and the tip that first elastic pin stretched into in the adapter sleeve butts with the butt terminal surface that corresponds; the utility model provides a pair of rotatory excessive force protection device and bottle lid revolve wrong device can realize screwing up the automation of lid, and can realize the excessive force protection, guarantees that the degree of screwing up of lid is unified, and structural design is simple, and is with low costs, uses the simple operation, changes in control, can be applied to all kinds of needs and revolve the scene of twisting the lid, uses the scene extensive.

Description

Rotary over-force protection device and bottle cap screwing device

Technical Field

The utility model relates to a technical field is twisted soon to the bottle lid, concretely relates to rotatory power protection device and bottle lid twist soon and twist device.

Background

The microwave digestion technology is to heat the reagent and the sample in a closed container by utilizing the penetrability and the activated reaction capability of the microwave, so that the pressure in the sample preparation container is increased, the reaction temperature is increased, the reaction rate is greatly increased, and the time for preparing the sample is shortened. The microwave digestion tank is widely applied to scientific research experiments in the fields of new materials, energy, environmental engineering and the like, and is a common small reactor for scientific research in teaching, scientific research units and chemical laboratories of colleges and universities.

Before the jar is cleared up to putting into the microwave with the microwave and clear up in the appearance, need clear up the lid of jar to the microwave and screw up the operation, the operation mode through manual screw up lid is wasted time and energy at present, and the degree of lid screwing up is difficult control, and is not unified.

The traditional bottle cap screwing mode can avoid the excessive rotation of the bottle cap only by separating the bottle body from the rotating mechanism, and has complex equipment design and higher cost in terms of structural design; from personnel's operation, operating personnel removes the bottle through the perception of the power of gripping when handheld jar body, because there is the different condition of different people's power of gripping, and even if the same one person operation also can have the same person because the reason of operating duration, the different condition of the power of gripping of front and back operation, consequently, when rotary mechanism continues to twist the lid, can be because of the power of gripping is different, also can't accomplish the unification of the degree of screwing up of lid.

Because the digestion tank generally needs to bear higher temperature and pressure, the screwing degree of the cover body is particularly important in terms of pretreatment and safety, because the screwing degree of the cover body in the prior art cannot be unified, under the normal condition, if the cover body is not screwed completely, tail gas leakage can be caused, and because the microwave digestion tank needs to bear high temperature and high pressure, the safety of the microwave digestion tank is difficult to ensure if the cover body does not reach the proper screwing degree; in addition, the rotating torque is too large to damage the can, so that it is urgently needed to design a rotating over-force protection device and a bottle cap screwing device which can effectively control the screwing degree of the cap body.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the above-mentioned prior art, the utility model provides a rotatory power protection device and bottle lid revolve wrong device can realize screwing up the automation of lid, and can realize the power protection, guarantees that the degree of screwing up of lid is unified, and structural design is simple, and is with low costs, uses the simple operation, changes in control, can be applied to all kinds of needs and revolve the scene of twisting the lid, uses the scene extensively.

The utility model discloses the technical scheme who adopts does:

the utility model provides a rotatory power protection device that crosses, includes rotary drive device, first connector and second connector, the first connector of rotary drive device drive rotates, first connector includes the adapter sleeve, the second connector include with the lid on the line cooperation realize rotating spacing dish and set up the connecting rod on spacing dish, circumference is equipped with a plurality of butt terminal surfaces on the connecting rod, the connecting rod is installed in the adapter sleeve, be equipped with first elastic pin on the adapter sleeve, first elastic pin evenly is equipped with a plurality ofly along adapter sleeve circumference, tip and the butt terminal surface butt that corresponds in the adapter sleeve are stretched into to first elastic pin.

In the technical scheme, the rotary driving device drives the first connector to rotate, the connecting rod is circumferentially provided with a plurality of abutting end faces, the end part of the first elastic pin extending into the connecting sleeve abuts against the corresponding abutting end face, namely, the rotary driving device drives the first connector to rotate, meanwhile, the abutting of the plurality of abutting end faces on the connecting rod can be realized through the arrangement of the plurality of first elastic pins in the connecting sleeve, namely, in the rotating process of the connecting sleeve, the first elastic pin can clamp the connecting rod, so that the rotary driving of the second connector is realized, the limiting disc of the second connector realizes the effective abutting joint of the first connector and the second connector through the matching of the upper lines and the outer lines of the cover body, when the position of the bottle body is kept still, an operator can hold the bottle body by hand to keep the bottle body still, then the second connector drives the cover body to rotate relative to the bottle body, so as to realize the twisting operation, and then continuously screwing, when the rotating acting force exceeds the clamping bearing force of the first elastic pin, the second connector automatically stops rotating along with the first connector, so that the cover body is prevented from continuously rotating, and the purpose of over-force protection is achieved.

Meanwhile, because the connecting rod is circumferentially provided with a plurality of abutting end faces, namely edges are arranged between adjacent abutting end faces, preferably designed to be arc edges, namely the part of the rod part on which the abutting end faces are arranged on the connecting rod is of a prism structure with a plurality of edges, when the rotating acting force exceeds the clamping bearing force of the first elastic pin, because the cover body and the bottle body are in a screwing state at the moment, the first elastic pin can automatically bounce off in the process that the first connector continues to rotate, the second connector stops rotating along the first connector, the end part of the first elastic pin moves along the periphery of the prism structure, in order to further reduce the friction resistance, the end part of the first elastic pin is provided with steel balls, namely when the first elastic pin is screwed to be over-stressed, the steel balls are in rolling fit with the periphery of the prism structure, at the moment, due to the design of the prism structure, the clamping effect of the first elastic pin on the connecting rod in the screwing process can be ensured, meanwhile, when the excessive screwing force is exerted, the balls roll along the periphery of the prism to generate a vibration effect, a certain prompting effect is achieved when the cover body is screwed in place, and the use and operation are convenient and fast.

This technical scheme from the structural cooperation relation that only needs prismatic structure between first elastic pin and the connecting rod, then can reach the excessive force protection effect, simple structure, it is with low costs.

During the operation, only need handheld bottle can, under the over-force state, first elastic pin can be opened by automatic bullet, not only can reach the over-force protection, still has prompt facility, simple operation.

To sum up, this technical scheme can realize screwing up the automation of lid, and can realize the excess force protection, guarantees that the degree of screwing up of lid is unified, and structural design is simple, and is with low costs, uses the simple operation, changes in the control, can be applied to all kinds of scenes that need twist the lid, and the application scene is extensive.

Furthermore, in order to match different second connectors according to different covers, the first connector is detachably connected with the second connector.

Furthermore, in order to guarantee the effective connection between connecting rod and the adapter sleeve, and conveniently realize the change to the second connector, be equipped with the limit structure that the restriction connecting rod is deviate from the adapter sleeve between connecting rod and the adapter sleeve.

Further, in order to guarantee the effective connection between connecting rod and the adapter sleeve, and conveniently realize the change to the second connector, limit structure includes that circumference sets up ring channel and circumference on the connecting rod and sets up a plurality of second elastic pin on the adapter sleeve, first elastic pin stretches into tip and ring channel butt in the adapter sleeve, the ring channel is located the below of butt end face, the second elastic pin is located the below of first elastic pin.

The butt cooperation of second elastic pin and ring channel can prevent that the second connector from deviating from the adapter sleeve, realizes the effective connection of the two, in addition, when needing to be changed the second connector, can directly take out the second connector through external force, later on change other second connector, can realize the joint of second elastic pin and ring channel in inserting the adapter sleeve with the connecting rod, change the simple operation, use more in a flexible way.

Furthermore, for the better drive of realization to first connector, rotary driving device is the motor, first connector includes the spliced pole, the spliced pole coaxial fixation is in the upper end of adapter sleeve, fixed connection between the output shaft of motor and the spliced pole.

Furthermore, the connecting rod passes through the screw coaxial arrangement on spacing dish.

Further, for the joint cooperation of better realization and lid, spacing dish has the cooperation chamber, cooperation intracavity wall circumference is equipped with a plurality of and the lid on a plurality of vertical retort recess complex vertical retort arch that circumference set up.

A bottle cap screwing device comprises the rotation over-force protection device.

Further, for the installation of better realization rotation overpower protection device, including the shell with set up the support body in the shell, rotation overpower protection device installs on the support body, spacing dish is located outside the shell.

Further, the shell includes first casing portion and second casing portion, second casing portion integrated into one piece is in one side of the upper end of first casing portion, the lower extreme of second casing portion is equipped with first opening, the lower extreme of second casing portion is equipped with the mounting panel, downwardly extending is equipped with the cover body on the mounting panel, the cover body sets up with first opening is coaxial, be equipped with the mounting bracket that is used for installing the motor on the support body, the lower extreme of mounting bracket is equipped with first installation cover, the internal second installation cover that is equipped with of cover, be equipped with the bearing housing between first installation cover and the second installation cover, be equipped with the bearing between the spliced pole of first connector and the bearing housing, the lower extreme of the cover body is equipped with the second opening, the second opening is stretched out to the lower extreme of second installation cover, the adapter sleeve is located the second installation cover.

The utility model has the advantages that: in the technical scheme, the rotary driving device drives the first connector to rotate, the connecting rod is circumferentially provided with a plurality of abutting end faces, the end part of the first elastic pin extending into the connecting sleeve abuts against the corresponding abutting end face, namely, the rotary driving device drives the first connector to rotate, meanwhile, the abutting of the plurality of abutting end faces on the connecting rod can be realized through the arrangement of the plurality of first elastic pins in the connecting sleeve, namely, in the rotating process of the connecting sleeve, the first elastic pin can clamp the connecting rod, so that the rotary driving of the second connector is realized, the limiting disc of the second connector realizes the effective abutting joint of the first connector and the second connector through the matching of the upper lines and the outer lines of the cover body, when the position of the bottle body is kept still, an operator can hold the bottle body by hand to keep the bottle body still, then the second connector drives the cover body to rotate relative to the bottle body, so as to realize the twisting operation, and then continuously screwing, when the rotating acting force exceeds the clamping bearing force of the first elastic pin, the second connector automatically stops rotating along with the first connector, so that the cover body is prevented from continuously rotating, and the purpose of over-force protection is achieved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic structural view of the center subassembly of the present invention;

fig. 5 is a schematic structural view of a first viewing angle of the second connector according to the present invention;

fig. 6 is a schematic structural view of a first connector according to the present invention;

fig. 7 is a schematic structural view of a second viewing angle of the second connector according to the present invention;

fig. 8 is a schematic partial sectional structure of the present invention.

In the figure: a connecting sleeve 1; a limiting disc 2; a connecting rod 3; abutting the end face 4; a first elastic pin 5; an annular groove 6; a second elastic pin 7; a motor 8; a connecting column 9; a mating cavity 10; vertical bar projections 11; a housing 12; a frame body 13; a first housing portion 14; a second housing part 15; an operating space 16; a first opening 17; a mounting plate 18; a cover 19; a mounting frame 20; a first mounting sleeve 21; a second mounting sleeve 22; a bearing sleeve 23; a bearing 24; a second opening 25; a lid 26; a bottle body 27; an operation key 28; a first connector 29; a second connecting head 30.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1:

as shown in fig. 1-8, this embodiment provides a rotatory overstress protection device, including the rotation driving device, first connector 29 and second connector 30, the rotation driving device drives first connector 29 and rotates, first connector 29 includes adapter sleeve 1, second connector 30 includes and realizes rotating spacing dish 2 and setting up the connecting rod 3 on spacing dish 2 with the cooperation of the outer line on the lid 26, the circumference is equipped with a plurality of butt terminal surfaces 4 on the connecting rod 3, connecting rod 3 installs in adapter sleeve 1, be equipped with first elastic pin 5 on adapter sleeve 1, first elastic pin 5 evenly is equipped with a plurality ofly along adapter sleeve 1 circumference, the tip that first elastic pin 5 stretched into in adapter sleeve 1 butts with the butt terminal surface 4 that corresponds.

In the technical scheme, as the rotary driving device drives the first connector 29 to rotate, the connecting rod 3 is circumferentially provided with a plurality of abutting end faces 4, the end part of the first elastic pin 5 extending into the connecting sleeve 1 abuts against the corresponding abutting end face 4, that is, the rotary driving device drives the first connector 29 to rotate, meanwhile, through the arrangement of the plurality of first elastic pins 5 in the connecting sleeve 1, the abutting of the plurality of abutting end faces 4 on the connecting rod 3 can be realized, that is, in the rotating process of the connecting sleeve 1, as the first elastic pin 5 can clamp the connecting rod 3, the rotary driving of the second connector 30 is realized, the effective abutting joint of the limiting disc 2 of the second connector 30 and the cover body 26 is realized through the matching of the limiting disc 2 and the outer grains on the cover body 26, when the position of the bottle body 27 is kept motionless, an operator can hold the bottle body 27 by hand to keep the bottle body motionless, the second connector 30 drives the cap 26 to rotate relative to the bottle 27 to achieve the screwing operation, and then the screwing operation is continued, when the rotational acting force exceeds the clamping bearing force of the first elastic pin 5, the second connector 30 automatically stops rotating along with the first connector 29, so that the cap 26 is prevented from continuing to rotate, and the purpose of over-force protection is achieved.

Meanwhile, because the connecting rod 3 is circumferentially provided with a plurality of abutting end faces 4, that is, edges are formed between adjacent abutting end faces 4, preferably, the abutting end faces are designed to be arc edges, that is, the part of the rod part on which the abutting end faces 4 are arranged on the connecting rod 3 is of a prism structure with a plurality of edges, when the rotating acting force exceeds the clamping bearing force of the first elastic pin 5, because the cover body 26 and the bottle body 27 are already in a screwing state at this time, the first elastic pin 5 can automatically bounce off in the process of continuous rotation of the first connector 29, the second connector 30 stops rotating along the first connector 29, the end part of the first elastic pin 5 moves along the periphery of the prism structure, in order to further reduce the friction resistance, the end part of the first elastic pin 5 is provided with steel balls, that is, when the screwing force is excessive, the steel balls are in rolling fit with the periphery of the prism structure, at this time, due to the design of the prism structure, not only can guarantee to revolve the tight effect of the clamp of twisting in-process first elastic pin 5 to connecting rod 3, can revolve when twisting the overpower simultaneously for the ball rolls along prismatic periphery, produces vibrations effect, revolves to the lid 26 and revolves to target in place and also has certain suggestion effect, uses the simple operation.

This technical scheme from the structural cooperation relation that only needs prismatic structure between first elastic pin 5 and the connecting rod 3, then can reach the excessive force protection effect, simple structure, it is with low costs.

During the operation, only need hand bottle 27 can, under the over-force state, first elastic pin 5 can be automatic bounced off, not only can reach the over-force protection, still has prompt facility, simple operation.

In conclusion, the technical scheme can realize automatic screwing of the cover body 26, can realize over-force protection, ensures that the screwing degrees of the cover body 26 are uniform, has simple structural design, low cost, convenient use and operation and easy control, can be applied to various scenes in which the cover body 26 needs to be screwed, and has wide application scenes.

Example 2:

this embodiment is optimized based on embodiment 1 described above.

In order to adapt different second connectors 30 to different covers 26, the first connector 29 is detachably connected to the second connector 30.

Example 3:

this embodiment is optimized based on embodiment 2 described above.

In order to ensure effective connection between the connecting rod 3 and the connecting sleeve 1 and conveniently realize replacement of the second connector 30, a limiting structure for limiting the connecting rod 3 to be separated from the connecting sleeve 1 is arranged between the connecting rod 3 and the connecting sleeve 1.

Example 4:

this embodiment is optimized based on embodiment 3 described above.

In order to guarantee the effective connection between connecting rod 3 and the adapter sleeve 1, and conveniently realize the change to second connector 30, limit structure includes that circumference sets up ring channel 6 and circumference on connecting rod 3 and sets up a plurality of second elastic pin 7 on adapter sleeve 1, tip and ring channel 6 butt in first elastic pin 5 stretches into adapter sleeve 1, ring channel 6 is located the below of butt end face 4, second elastic pin 7 is located the below of first elastic pin 5.

Second elastic pin 7 cooperates with the butt of ring channel 6, can prevent that second connector 30 from deviating from adapter sleeve 1, realize the effective connection of the two, in addition, when second connector 30 is changed to needs, can directly take out second connector 30 through external force, later on change other second connector 30, insert connecting rod 3 and can realize the joint of second elastic pin 7 with ring channel 6 in the adapter sleeve 1, change the simple operation, it is more nimble to use.

Example 5:

this embodiment is optimized based on embodiment 4 described above.

In order to better realize the driving of the first connecting head 29, the rotary driving device is a motor 8, the first connecting head 29 comprises a connecting column 9, the connecting column 9 is coaxially fixed at the upper end of the connecting sleeve 1, and an output shaft of the motor 8 is fixedly connected with the connecting column 9.

Example 6:

this embodiment is optimized based on embodiment 5 described above.

The connecting rod 3 is coaxially arranged on the limiting disc 2 through a screw.

Example 7:

this embodiment is optimized based on embodiment 6 described above.

For the better joint cooperation of realization and lid 26, spacing dish 2 has cooperation chamber 10, and cooperation chamber 10 inner wall circumference is equipped with a plurality of and lid 26 go up a plurality of vertical retort groove complex vertical retort arch 11 that circumference set up.

Example 8:

as shown in fig. 1-8, a closure twisting device includes a rotational override mechanism.

Example 9:

this embodiment is optimized based on embodiment 8 described above.

In order to better realize the installation of the over-rotation force protection device, the over-rotation force protection device comprises a shell 12 and a frame body 13 arranged in the shell 12, the over-rotation force protection device is installed on the frame body 13, and the limiting disc 2 is positioned outside the shell 12.

Example 10:

this embodiment is optimized based on embodiment 9 described above.

The housing 12 includes a first housing portion 14 and a second housing portion 15, the second housing portion 15 is integrally formed on one side of an upper end of the first housing portion 14, an operation space 16 is below the second housing portion 15, which facilitates the butt joint of a cover 26 of a bottle 27 into a second connector 30, a first opening 17 is disposed at a lower end of the second housing portion 15, a mounting plate 18 is disposed at a lower end of the second housing portion 15, a cover 19 extends downward from the mounting plate 18, the cover 19 and the first opening 17 are coaxially disposed, a mounting frame 20 for mounting the motor 8 is disposed on the frame 13, a first mounting sleeve 21 is disposed at a lower end of the mounting frame 20, a second mounting sleeve 22 is disposed in the cover 19, a bearing sleeve 23 is disposed between the first mounting sleeve 21 and the second mounting sleeve 22, a bearing 24 is disposed between a connection column 9 of the first connector 29 and the bearing sleeve 23, a second opening 25 is disposed at a lower end of the cover 19, and a second opening 25 extends out of the second mounting sleeve 22, the connecting sleeve 1 is located in the second mounting sleeve 22.

It should be noted that, in this technical scheme, be equipped with operation button 28 on the shell, can realize a key start, the simple operation, can change different first elastic pin 5 through the screw capping demand of difference, the moment of torsion is adjustable, can fix, the quantity of first elastic pin 5 and second elastic pin 7 can set up as required, this device can realize the automatic protection of excess force, because probably change second connector 30, consequently, can match with the different lid 26 of different producer production, use the microwave to clear up the jar, also can match the microwave of different models and clear up the jar, the pretreatment for the sample provides higher possibility, work efficiency obtains promoting.

It should be noted that the device can be applied to screwing the cover body of the microwave digestion tank and can be applied to other application scenes as long as the bottle body needs to be screwed.

The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.

Claims

1. A rotary over-force protection device is characterized in that: including rotary drive device, first connector and second connector, the first connector of rotary drive device drive rotates, first connector includes the adapter sleeve, the second connector include with the lid on the external thread cooperation realize rotating spacing dish and set up the connecting rod on spacing dish, circumference is equipped with a plurality of butt terminal surfaces on the connecting rod, the connecting rod is installed in the adapter sleeve, be equipped with first cushion cap on the adapter sleeve, first cushion cap evenly is equipped with a plurality ofly along adapter sleeve circumference, tip and the butt terminal surface butt that corresponds in the first cushion cap stretches into the adapter sleeve.

2. A rotational over-force protection device as claimed in claim 1, wherein: the first connector is detachably connected with the second connector.

3. A rotational over-force protection device as claimed in claim 1, wherein: and a limiting structure for limiting the connecting rod to be separated from the connecting sleeve is arranged between the connecting rod and the connecting sleeve.

4. A rotational over-force protection device as claimed in claim 3, wherein: the limiting structure comprises an annular groove and a plurality of second elastic pins, wherein the annular groove is circumferentially arranged on the connecting rod, the second elastic pins are circumferentially arranged on the connecting sleeve, the first elastic pins stretch into the end parts of the connecting sleeve and abutted against the annular groove, the annular groove is located below the abutted end face, and the second elastic pins are located below the first elastic pins.

5. A rotational over-force protection device as claimed in claim 1, wherein: the rotary driving device is a motor, the first connecting head comprises a connecting column, the connecting column is coaxially fixed at the upper end of the connecting sleeve, and an output shaft of the motor is fixedly connected with the connecting column.

6. A rotational over-force protection device as claimed in claim 1, wherein: the connecting rod is coaxially arranged on the limiting disc through a screw.

7. A rotational over-force protection device as claimed in claim 1, wherein: the limiting disc is provided with a matching cavity, and a plurality of vertical bar protrusions matched with a plurality of vertical bar grooves circumferentially arranged on the cover body are circumferentially arranged on the inner wall of the matching cavity.

8. A bottle cap screwing device is characterized in that: comprising a rotational over-force protection device as claimed in any one of claims 1-7.

9. The device of claim 8, wherein: including shell and the support body of setting in the shell, rotatory power protection device installs on the support body, spacing dish is located outside the shell.

10. The device of claim 9, wherein: the shell includes first casing portion and second casing portion, second casing portion integrated into one piece is in one side of the upper end of first casing portion, the lower extreme of second casing portion is equipped with first opening, the lower extreme of second casing portion is equipped with the mounting panel, downwardly extending is equipped with the cover body on the mounting panel, the cover body sets up with first opening is coaxial, be equipped with the mounting bracket that is used for installing the motor on the support body, the lower extreme of mounting bracket is equipped with first installation cover, the internal second installation cover that is equipped with of cover, be equipped with the bearing housing between first installation cover and the second installation cover, be equipped with the bearing between the spliced pole of first connector and the bearing housing, the lower extreme of the cover body is equipped with the second opening, the second opening is stretched out to the lower extreme of second installation cover, the adapter sleeve is located the second installation cover.