CN211706340U

CN211706340U - Waste gas treatment device suitable for meat meal processing

Info

Publication number: CN211706340U
Application number: CN202020036707.9U
Authority: CN
Inventors: 孙曾红
Original assignee: Yutian Yutai Feed Co ltd
Current assignee: Yutian Yutai Feed Co ltd
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-10-20
Anticipated expiration: 2030-01-08

Abstract

The utility model relates to a waste gas treatment device suitable for meat powder processing, relate to the technical field of meat powder production facility, which comprises a frame, vertically in the frame set firmly a columniform absorption section of thick bamboo, the input of an absorption section of thick bamboo is connected with the draught fan, the output of an absorption section of thick bamboo has set firmly ammonia consistency transmitter, horizontal arrangement is provided with two absorption chambeies in the absorption section of thick bamboo, it has honeycomb active carbon to adsorb intracavity packing, two absorption chambeies all are provided with the control valve with the output and the input intercommunication department of an absorption section of thick bamboo, the quantity of control valve is four, ammonia consistency transmitter is connected with the control valve electricity, be provided with the change mouth on the absorption section of thick bamboo, the quantity of changing the mouth is two and the symmetry sets up the both sides at an absorption section of thick bamboo, change the mouth respectively with the absorption chamber intercommunication that corresponds, be. The utility model discloses have and adsorb through the duplex position and handle waste gas and can not interrupt the technological effect of exhaust-gas treatment process when making to change the absorption material.

Description

Waste gas treatment device suitable for meat meal processing

Technical Field

The utility model belongs to the technical field of the technique of meat powder production facility and specifically relates to a waste gas treatment device suitable for meat powder processing is related to.

Background

The meat powder is prepared by taking livestock bodies, residual broken meat, bones, internal organs and the like which are not suitable for eating in livestock slaughter houses as raw materials, and carrying out high-temperature cooking, degreasing, drying and crushing. The crude protein content of the meat meal is generally between 50% and 60%, and the amino acid components are balanced, so that the meat meal is an important component of the livestock and poultry feed.

The prior patent document with application publication number CN109170987A discloses a meat powder production device and a process, which comprises the steps of cleaning animal tissues and organs, then breaking ice, stewing the broken animal tissues and organs at high temperature, deodorizing waste gas generated in the process and then discharging; carrying out three-stage squeezing degreasing on the animal tissue organ after high-temperature cooking, and increasing the squeezing pressure section by section; squeezing and degreasing animal tissues and organs to produce meat powder and an oil-water mixture, drying the meat powder, deodorizing waste gas generated in the drying process, discharging, and performing oil-water separation on the oil-water mixture; cooling the dried meat powder, removing dust generated in the cooling process, bagging the cooled meat powder for storage, deodorizing waste gas generated in the storage process, and then discharging; and (3) sending the oil after oil-water separation to an oil storage tank for storage, sending water to a wastewater recycling system, extracting the collagen in the water, and then sending the rest water to a drying tank.

The above prior art solutions have the following drawbacks: the waste gas generated in the heating and drying process contains a large amount of ammonia gas and hydrogen sulfide, both the ammonia gas and the hydrogen sulfide belong to malodorous gas, and the ammonia gas and the hydrogen sulfide are toxic to a human body when the concentration reaches a certain degree. Therefore, the drying waste gas can be discharged only after being subjected to deodorization treatment, and the existing deodorization method is an activated carbon adsorption method. When the adsorption of the activated carbon is saturated, new activated carbon must be replaced in time, otherwise, the treatment effect of waste gas is influenced. The waste gas treatment process must be suspended during replacement, which affects the waste gas treatment efficiency.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a waste gas treatment device suitable for meat meal processing, waste gas treatment is efficient and do not receive to change the absorption material influence.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: waste gas treatment device suitable for meat powder processing, which comprises a frame, the vertical columniform absorption section of thick bamboo that has set firmly in the frame, the input of absorption section of thick bamboo is connected with the draught fan, the output of absorption section of thick bamboo has set firmly ammonia consistency transmitter, horizontal arrangement is provided with two absorption chambeies in the absorption section of thick bamboo, it has honeycomb active carbon, two to adsorb the intracavity the absorption chamber all is provided with the control valve with the output and the input intercommunication of absorption section of thick bamboo and intercommunication department, the quantity of control valve is four, ammonia consistency transmitter is connected with the control valve electricity, be provided with the change mouth that is used for changing honeycomb active carbon on the absorption section of thick bamboo, the quantity of changing the mouth is two and the symmetry sets up the both sides at the absorption section of thick bamboo, change mouth respectively with the absorption chamber intercommunication that corresponds, be provided with the closure piece that is used for sealing the change mouth on the absorption section of thick bamboo, set firmly the numerical value that is used, And the display screen is used for displaying the working state of the control valve and the record of the switch of the control valve.

Through adopting above-mentioned technical scheme, only the control valve of the input and the output in one absorption chamber is the on-state under the normality, get into through draught fan drive waste gas and adsorb in the section of thick bamboo, waste gas only can adsorb the honeycomb active carbon contact of intracavity with one of them, and realize the absorption purification of ammonia and hydrogen sulfide through the porous structure of active carbon, ammonia concentration sensor real-time detection purifying effect occasionally discharges, it explains when ammonia concentration rises suddenly that honeycomb active carbon has adsorbed saturation and purifying effect not good, the control valve changes operating condition because of receiving the signal that ammonia concentration sensor sent, waste gas and the contact of honeycomb active carbon in another absorption intracavity, thereby realize the in-process of the absorption purification of duplex position automatic switch, the user can not interrupt the purifying process when changing the absorption material, the treatment effeciency of waste gas is high, the feature of environmental protection is good.

The present invention may be further configured in a preferred embodiment as: the absorption cavity is filled with and is filtered the piece, filter the input setting that is close to the absorption cavity, the honeycomb activated carbon setting is in the top of filtering the piece, the output setting in the absorption cavity is in the top of honeycomb activated carbon, the input in absorption cavity sets up and filters by the piece.

Through adopting above-mentioned technical scheme, filter and contact earlier with waste gas, can filter large granule impurities such as dust in the waste gas, avoid its porous structure who blocks up honeycomb activated carbon and influence the effect of absorption purification, the treatment effect of waste gas is better.

The present invention may be further configured in a preferred embodiment as: the filter piece comprises a filter box and a plurality of layers of non-woven fabrics fixedly arranged in the filter box, and the honeycomb activated carbon is stacked and laid on the top surface of the filter box.

Through adopting above-mentioned technical scheme, the non-woven fabrics can also adsorb moisture when intercepting large granule impurities such as dust, reduces honeycomb activated carbon because of soaking the not good possibility of effect of absorption purification.

The present invention may be further configured in a preferred embodiment as: the closed part includes and adsorbs a section of thick bamboo and pass through the arc shrouding that the screw can dismantle fixedly, the area of shrouding is greater than the area of changing the mouth and the shrouding is close to the one end of changing the mouth and is and the echelonment with change the interior week side wall gomphosis of mouth, it is fixed with the sealing washer to change mouthful interior week.

Through adopting above-mentioned technical scheme, the user realizes the convenient of shrouding through the screw member and tears the ann open, and the shrouding seals to change the mouth occasionally the sealing washer prevents that waste gas from leaking, tears the ann and just seals effectually.

The present invention may be further configured in a preferred embodiment as: the adsorption cylinder is characterized in that a supporting plate abutted against the bottom surface of the sealing plate is fixed on the periphery of the adsorption cylinder, and a dovetail-shaped sliding rail connected with the bottom end of the sealing plate in a sliding mode along the depth direction of the replacement port is fixed on the supporting plate.

Through adopting above-mentioned technical scheme, be connected through sliding rail and shrouding and remove the trouble that the user aligns the shrouding and change the mouth from, and have the backup pad to provide ascending holding power when removing the shrouding, save the manpower when changing the position of shrouding, it is more convenient to use.

The present invention may be further configured in a preferred embodiment as: the periphery of the adsorption cylinder is fixed with travel switches, the number of the travel switches is two, the travel switches are respectively close to the top surfaces of the two supporting plates, and the travel switches are electrically connected with the display screen.

Through adopting above-mentioned technical scheme, whether the shrouding makes travel switch's the state of opening and close change with the travel switch butt, and then travel switch sends the signal to the display screen when the shrouding is opened and close, and the user can acquire the record of opening and close of shrouding on the display screen to it finishes to make clear and definite which adsorbs the absorption material of intracavity, and it is more convenient to use.

The present invention may be further configured in a preferred embodiment as: the shrouding is provided with the handle in the periphery, the quantity of handle is two and the symmetry sets up the both ends at the shrouding.

Through adopting above-mentioned technical scheme, the handle can the person of facilitating the use to the shrouding afterburning and displacement shrouding, and it is more convenient to change the absorption material.

The present invention may be further configured in a preferred embodiment as: the handle is rotatably connected with the periphery of the sealing plate, the rotating surface of the handle is horizontal, an accommodating groove used for accommodating the handle in a normal state is formed in the periphery of the sealing plate, a magnetic sheet is fixed on the handle, a magnetic block is embedded on the inner bottom surface of the accommodating groove, the magnetic sheet and the magnetic block are magnetically adsorbed in the normal state, the handle is completely positioned in the accommodating groove, and a gap is formed between the inner side wall of the accommodating groove and the periphery of the handle in the normal state.

Through adopting above-mentioned technical scheme, the absorption of magnetic block and magnetic sheet makes the handle can keep accomodating the state in the accepting groove, and the accommodating space of accepting groove is greater than the volume of handle, and manual separation handle and accepting groove are convenient, use and accomodate the handle convenient, and the handle is not outstanding in the shrouding under the normality, and pleasing to the eye degree is good.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the adsorption purification of double stations is realized through the two adsorption cavities, and the automatic double-station switching when the adsorption of the honeycomb activated carbon is saturated is realized through the ammonia concentration sensor and the control valve, so that the influence on the adsorption purification effect caused by the replacement or untimely replacement of the honeycomb activated carbon is avoided, the waste gas treatment efficiency is high, and the environmental protection property is good;

2. the absorption intracavity still is provided with and filters the piece, can filter large granule impurity such as dust in advance, avoids honeycomb activated carbon not good because of the effect that blocks up and adsorb the purification, and the treatment effect of waste gas is good.

Drawings

Fig. 1 is a schematic view of the overall structure of the embodiment.

Fig. 2 is a sectional view of an internal structure of the adsorption chamber according to the embodiment.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

Fig. 4 is a schematic structural diagram of a travel switch according to an embodiment.

Figure 5 is a schematic view of the overall structure of the closure plate according to an embodiment.

Fig. 6 is a partially enlarged schematic view of a portion B in fig. 5.

In the figure, 1, a frame; 11. a display screen; 12. an induced draft fan; 13. an exhaust pipe; 14. an ammonia gas concentration sensor; 2. an adsorption cylinder; 21. an adsorption chamber; 211. honeycomb activated carbon; 212. a filter member; 2121. a filter cartridge; 2122. non-woven fabrics; 213. a control valve; 214. replacing the port; 2141. a seal ring; 3. a closure; 31. closing the plate; 311. a chute; 32. a handle; 321. a magnetic sheet; 33. an accommodating groove; 331. a magnetic block; 4. a support plate; 41. a slide rail; 42. a travel switch.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, for the utility model discloses a waste gas treatment device suitable for meat meal processing, including frame 1, be fixed with the vertical cylindrical adsorption cylinder 2 of axis in frame 1. The input setting of an adsorption cylinder 2 is in the lower part of an adsorption cylinder 2 periphery, and the input of an adsorption cylinder 2 is connected with draught fan 12, and the input and the waste gas source intercommunication of draught fan 12. The output end of the adsorption cylinder 2 is arranged on the top surface of the adsorption cylinder 2 and is connected with an exhaust pipe 13 with a vertical axis, and an ammonia gas concentration sensor 14 is fixed in the exhaust pipe 13. Two adsorption cavities 21 are horizontally and symmetrically arranged in the adsorption cylinder 2, the horizontal section of each adsorption cavity 21 is semicircular, and the adsorption cavities 21 are filled with honeycomb activated carbon 211. The two adsorption cavities 21 are communicated with the input end and the output end of the adsorption cylinder 2, the communication pipelines are not interfered with each other, and the input end and the output end of the adsorption cavity 21 are provided with electromagnetic control valves 213. The number of the control valves 213 is four, and every two control valves 213 are provided in one set, each set being provided corresponding to one adsorption chamber 21. The adsorption cylinder 2 is provided with two replacement ports 214 for replacing the honeycomb activated carbon 211, and the two replacement ports 214 are symmetrically arranged on two sides of the adsorption cylinder 2. The adsorption cylinder 2 is provided with a closing part 3 for closing the replacement port 214, and the frame 1 is fixedly provided with a display screen 11. The display screen 11 is electrically connected with the ammonia gas concentration sensor 14 and the control valve 213, the ammonia gas concentration sensor 14 is electrically connected with the control valve 213, and the information displayed on the display screen 11 comprises the ammonia gas concentration in the exhaust gas, the current working state of the control valve 213 and the on-off record of the control valve 213.

The induced draft fan 12 drives the exhaust gas to enter the input end of the adsorption cylinder 2, and the one set of control valves 213 is closed and the other set of control valves 213 is opened in a normal state. Waste gas contacts with the honeycomb activated carbon 211 in the adsorption cavity 21 corresponding to the opened control valve 213, ammonia gas and hydrogen sulfide can be adsorbed by the porous structure of the honeycomb activated carbon 211, and the waste gas enters the exhaust pipe 13 from the output end of the adsorption cylinder 2 after being adsorbed and purified by the honeycomb activated carbon 211 and then is discharged to the atmosphere environment at a high position. The ammonia concentration in the exhaust gas can be monitored in real time by the user through the ammonia concentration sensor 14, and when the honeycomb activated carbon 211 is adsorbed and saturated, the ammonia concentration in the exhaust gas can rise rapidly because the adsorption and purification effects are poor. When the ammonia gas concentration sensor 14 detects the ammonia gas concentration which rises suddenly, it sends a signal to the control valves 213, the originally opened group of control valves 213 are closed, and the originally closed group of control valves 213 are opened, so that the exhaust gas contacts the honeycomb activated carbon 211 which is not adsorbed and saturated in the other adsorption chamber 21. Through the above operation, the automatic switching of the exhaust gas flow loop after the honeycomb activated carbon 211 is saturated in adsorption is realized, and the process of exhaust gas adsorption and purification cannot be interrupted when a user removes the closing piece 3 and replaces the honeycomb activated carbon 211. The user can obtain the switch record of control valve 213 from display screen 11, and the record of the time point of work and the number of times of alternating through two sets of control valve 213 is clear which honeycomb activated carbon 211 that adsorbs in the chamber 21 need be changed, and it is convenient and exhaust-gas treatment is efficient to change, and environmental protection is effectual.

Referring to fig. 2, an output end of the adsorption chamber 21 is disposed on an inner top surface of the adsorption chamber 21, and an output end of the adsorption chamber 21 is disposed at a lower portion of an inner periphery of the adsorption chamber 21. The adsorption cavity 21 is sequentially filled with honeycomb activated carbon 211 and a filter element 212 from top to bottom, and the height of the filter element 212 is higher than the input end of the adsorption cavity 21. The filter element 212 includes eight filter cartridges 2121 each having a hollow end surface and a plurality of non-woven fabrics 2122 fixed in the filter cartridges 2121, the non-woven fabrics 2122 are arranged in a row along the length direction of the filter cartridges 2121, and the plurality of honeycomb activated carbons 211 are stacked on the top surface of the filter cartridges 2121.

Non-woven fabrics 2122 can filter the large granule impurity in the waste gas, avoids large granule impurity to block up the porous structure of active carbon, and then influences the effect that the active carbon adsorption purified. The multilayer non-woven fabrics 2122's filter effect is good, and can absorb moisture, avoids moisture to soak the active carbon and influences the effect that the active carbon adsorption purified. The user gets in order to put honeycomb active carbon 211 and filter cartridge 2121 and can realize the change of adsorption material, and adsorption material sets up and changes the convenience and adsorption effect is stable, convenient to use.

Referring to fig. 3 and 4, the closing member 3 includes an arc-shaped closing plate 31 detachably fixed to the suction cylinder 2 by a screw, and the replacement port 214 has a rectangular shape. The sealing plate 31 has an area larger than that of the replacement port 214, and one end of the sealing plate 31 near the replacement port 214 is stepped to be fitted to the inner peripheral side wall of the replacement port 214, and a sealing ring 2141 made of rubber is fixed to the inner periphery of the replacement port 214. A support plate 4 abutting against the bottom surface of the seal plate 31 is fixed to the outer peripheral surface of the suction cylinder 2, and a dovetail slide rail 41 slidably connected to the bottom end of the seal plate 31 in the depth direction of the replacement port 214 is fixed to the support plate 4. The supporting plate 4 is provided with a sliding groove 311 connected with the sliding rail 41 in a sliding manner, and the sliding groove 311 horizontally penetrates through the supporting plate 4. The peripheral surface of the adsorption cylinder 2 is embedded with two travel switches 42, and the number of the travel switches 42 is two and is respectively close to the top surfaces of the two support plates 4. The travel switch 42 is electrically connected to the display screen 11, and the data displayed on the display screen 11 includes the opening and closing times and the opening and closing time of the closing plate 31.

The packing 2141 makes it difficult for exhaust gas to leak from the replacement port 214, and thus has a low possibility of secondary environmental pollution. After the user has replaced the honeycomb activated carbon 211 and the filter cartridge 2121, the sealing plate 31 is placed on the support plate 4, the sliding groove 311 is embedded in the sliding rail 41, the sealing plate 31 is horizontally slid to enable the sealing plate 31 to be embedded in the replacement port 214, and then the relative positions of the sealing plate 31 and the adsorption cylinder 2 are fixed through the screws. The trouble that the mouth 214 and the shrouding 31 are changed to manual alignment of user has been removed from through the sliding connection of shrouding 31 with backup pad 4, and the support of accessible backup pad 4 uses manpower sparingly when just sliding, and it is more convenient to tear open and install shrouding 31. Can touch and extrude travel switch 42 when shrouding 31 seals to change mouth 214, travel switch 42 case display screen 11 signals this moment, and shrouding 31 seals to change mouth 214 once and represents that adsorption material changes once, and the user can count from this whether the life of adsorption material and further the adsorption material who makes clear of in the absorption chamber 21 need change, and it is more convenient to use.

Referring to fig. 5 and 6, in order to further facilitate the replacement of the honeycomb activated carbon 211 by the user, the sealing plate 31 is provided at the outer circumference thereof with two handles 32, and the handles 32 are symmetrically provided at both ends of the sealing plate 31. The handle 32 is rotatably connected with the closing plate 31 and the rotating surface is horizontal. The sealing plate 31 is provided with two accommodating grooves 33 on the periphery thereof for accommodating the handles 32 by a user in a normal state, and the two accommodating grooves 33 are respectively arranged at the two handles 32. The handle 32 is fixed with a magnetic sheet 321, and a magnetic block 331 is embedded on the inner bottom surface of the storage groove 33. The magnetic force of the magnetic block 331 and the magnetic piece 321 attract each other, and when the handle 32 is completely positioned in the housing groove 33, the magnetic block 331 and the magnetic piece 321 abut against each other, and a gap is formed between the handle 32 and the inner wall of the housing groove 33.

The user can move the sealing plate 31 by applying a force to the handle 32, and the handle 32 is accommodated in the accommodation groove 33 due to the magnetic attraction between the magnetic block 331 and the magnetic attraction piece in a normal state. The movable sealing plate 31 is convenient to move, the handle 32 is convenient to store, and the gap between the handle 32 and the inner side wall of the accommodating groove 33 is convenient for a user to manually separate the handle 32 from the accommodating groove 33, so that the use is convenient. The periphery of the sealing plate 31 is not protruded with the handle 32 to influence the beauty under normal state, and the using effect is good.

The implementation principle of the embodiment is as follows: the double-station adsorption purification is realized through the two adsorption cavities 21 capable of working alternately, when the honeycomb activated carbon 211 in one adsorption cavity 21 adsorbs and purifies waste gas, the honeycomb activated carbon 211 in the other adsorption cavity 21 is replaceable, the automatic switching of double working is realized through the ammonia concentration sensor 14 and the control valve 213, the display screen 11 is used for counting and displaying ammonia concentration data of discharged gas, the working state of the control valve 213, the history of the change of the working state of the control valve 213 and the history of the opening and closing of the sealing plate 31, and a user can conveniently determine whether adsorption materials need to be changed or not.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. Waste gas treatment device suitable for meat powder processing, including frame (1), its characterized in that: the vertical columniform that has set firmly in frame (1) adsorbs a section of thick bamboo (2), the input that adsorbs a section of thick bamboo (2) is connected with draught fan (12), the output of adsorbing a section of thick bamboo (2) has set firmly ammonia consistency transmitter (14), it is provided with two absorption chamber (21) to adsorb horizontal arrangement in a section of thick bamboo (2), it is filled with honeycomb activated carbon (211) to adsorb chamber (21), two it all communicates and the department of intercommunication with the output and the input of adsorbing a section of thick bamboo (2) and is provided with control valve (213) to adsorb chamber (21), the quantity of control valve (213) is four, ammonia consistency transmitter (14) are connected with control valve (213) electricity, be provided with on adsorbing a section of thick bamboo (2) and change mouth (214) that are used for changing honeycomb activated carbon (211), the quantity of changing mouth (214) is two and the symmetry sets up in the both sides of adsorbing a section of thick bamboo (2), change mouth (214) and adsorption cavity (21) intercommunication that corresponds respectively, be provided with on the adsorption cylinder (2) and be used for sealing and change closure member (3) of mouth (214), set firmly display screen (11) that are used for showing numerical value, control valve (213) operating condition and control valve (213) switch record of ammonia concentration sensor (14) real-time detection on frame (1).

2. The exhaust gas treatment device for meat meal processing according to claim 1, wherein: the absorption cavity (21) is filled with and filters piece (212), filter piece (212) and be close to the input setting in absorption cavity (21), honeycomb activated carbon (211) set up the top of filtering piece (212), the output setting in the top of honeycomb activated carbon (211) in absorption cavity (21), the input setting in absorption cavity (21) is by filtering piece (212).

3. An exhaust gas treatment device suitable for meat meal processing according to claim 2, wherein: the filter element (212) comprises a filter box (2121) and a plurality of layers of non-woven fabrics (2122) fixedly arranged in the filter box (2121), and the honeycomb activated carbon (211) is stacked and paved on the top surface of the filter box (2121).

4. The exhaust gas treatment device for meat meal processing according to claim 1, wherein: closure piece (3) including with adsorbing section of thick bamboo (2) can dismantle fixed arc shrouding (31) through the screw, the area of shrouding (31) is greater than the area of changing mouthful (214) and shrouding (31) are close to the one end of changing mouthful (214) and be and change the echelonment of mouthful (214) interior side wall gomphosis, it is fixed with sealing washer (2141) to change mouthful (214) interior week.

5. The exhaust gas treatment device for meat meal processing according to claim 4, wherein: adsorb a section of thick bamboo (2) periphery on be fixed with backup pad (4) with shrouding (31) bottom surface butt, be fixed with on backup pad (4) with shrouding (31) bottom along the dovetail slide rail (41) of the degree of depth direction sliding connection of changing mouth (214).

6. The exhaust gas treatment device for meat meal processing according to claim 5, wherein: be fixed with travel switch (42) on adsorbing a section of thick bamboo (2) periphery, travel switch (42)'s quantity is two and is close to two backup pad (4) top surface settings respectively, travel switch (42) are connected with display screen (11) electricity.

7. The exhaust gas treatment device for meat meal processing according to claim 4, wherein: the periphery of the sealing plate (31) is provided with two handles (32), and the two handles (32) are symmetrically arranged at two ends of the sealing plate (31).

8. The exhaust gas treatment device for meat meal processing according to claim 7, wherein: the handle (32) is rotatably connected with the periphery of the sealing plate (31), the rotating surface of the handle (32) is horizontal, an accommodating groove (33) used for accommodating the handle (32) in a normal state is formed in the periphery of the sealing plate (31), a magnetic sheet (321) is fixed on the handle (32), a magnetic block (331) is embedded on the inner bottom surface of the accommodating groove (33), the magnetic sheet (321) and the magnetic block (331) are magnetically adsorbed in the normal state, the handle (32) is completely positioned in the accommodating groove (33), and a gap exists between the inner side wall of the accommodating groove (33) and the periphery of the handle (32) in the normal state.