A portable POS terminal device

Abstract

The present invention discloses a POS terminal device that is easy to carry, including a shell and a sleeve, a display screen is arranged at the head position of the upper end surface of the shell, a card swiping slot is arranged on the upper end surface of the outer plate, a storage slot is arranged on the front end surface of the sleeve corresponding to the shell, a built-in block is arranged on the inner wall of one side of the storage slot, and an adjustable locking block is arranged on the head of the built-in block. The POS terminal device that is easy to carry described in the present invention belongs to the field of POS machines, and a top sealing plate that can be quickly adjusted is arranged above the shell to cover and protect the key area to avoid accidental contact, and a self-clamping plate that can automatically adjust the position is arranged above the card swiping slot. The self-clamping plate can effectively cover and protect the POS terminal device to avoid the mixing of dust, impurities and moisture, and a sleeve that can be quickly disassembled and assembled is arranged on the outer ring of the shell, and the movable block on one side is used for adjustment, so that protection can be provided during carrying and movement to reduce damage caused by collision and falling.

Description

Technical Field

[0001] The present invention relates to the field of POS machines, and in particular to a portable POS terminal device. Background Art

[0002] POS terminal equipment refers to a terminal reader equipped with barcode or OCR code technology, with cash or barter limit teller function. Its main task is to provide data services and management functions for commodity and media transactions, and to conduct non-cash settlement. POS is a multi-functional terminal. When it is installed in the designated merchants and acceptance outlets of credit cards and connected to the computer network, it can realize automatic electronic fund transfer. It has functions such as supporting consumption, pre-authorization, balance inquiry and transfer. It is safe, fast and reliable to use. Basic business intelligence is difficult to obtain in large transactions. The introduction of POS system is mainly to solve the blind spots of information management in the retail industry, and it is also an important part of the chain store management information system.

[0003] Common POS terminal devices include small POS devices that are easy to carry and move, equipped with Bluetooth, USB and other connection methods, which can meet the needs of most users for mobile travel. However, small POS devices are small in size and have low power consumption, and need to adopt power-saving methods to maintain longer use. When users carry small POS devices, since the key area of ​​the small POS devices is directly exposed, it is very easy to be turned on or repeatedly lit up due to accidental touch when placed in a pocket, thereby causing a waste of power. At the same time, the card swipe slot of the small POS device is directly exposed, and the card swipe slot is mixed with sand, dust and moisture. Moisture may cause the card swipe slot to be insensitive, and impurities such as sand and dust may scratch the card. At the same time, the small POS device has a relatively simple structure and insufficient protection performance. Once it is hit or dropped, it is very easy to be damaged, causing inconvenience. Summary of the invention

[0004] The main purpose of the present invention is to provide a portable POS terminal device, which can effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A portable POS terminal device comprises a shell and a sleeve, wherein a display screen is arranged at the head position of the upper end surface of the shell, a keypad area is arranged at the tail position of the upper end surface of the shell, an outer plate is arranged at the head position of the shell, a card swiping slot is arranged at the upper end surface of the outer plate, a storage slot is arranged at the front end surface of the sleeve corresponding to the shell, a built-in block is arranged at the inner wall of one side of the storage slot, an adjustable locking block is arranged at the head of the built-in block, the locking block is located at the outer side of the shell, an adjustable self-clamping plate is arranged at the head position of the shell above the outer plate, and a protective strip is arranged at the outer ring of the self-clamping plate An adjustable top sealing plate is provided at the tail position of the upper end surface of the shell, and the top sealing plate is located above the key area. By providing a quickly adjustable top sealing plate above the shell, the key area is covered and protected to avoid accidental contact. At the same time, a self-clamping plate that can automatically adjust its position is provided above the card swiping slot. The self-clamping plate can effectively cover and protect the POS terminal device to avoid the mixing of dust, impurities and moisture. At the same time, a quickly disassembled sleeve is provided on the outer ring of the shell, which is adjusted by a movable block on one side. It can be protected when carrying and exercising, reducing damage caused by collision and falling.

[0007] Preferably, both ends of the inner end surface of the self-clamping plate are arc surfaces, the protective strip is fixed to the outer circle of the self-clamping plate by bonding, the upper end surface of the top sealing plate is at the same height as the upper end surface of the display screen and the upper end surface of the self-clamping plate, and a top convex plate is provided at the tail position of the upper end surface of the top sealing plate.

[0008] Preferably, a built-in groove is provided on one end face of the sleeve corresponding to the built-in block, the tail end of the built-in groove is connected to the storage groove, the built-in block is fixed to the high built-in groove by bonding, a fitting plate is provided on the outer side of the built-in block on one end face of the sleeve, an adjustable movable block is provided on the head of the fitting plate, and side straight plates are provided on the upper and lower positions of the movable block on one end face of the sleeve.

[0009] Preferably, limit blocks are provided on the upper and lower end surfaces of the movable block, the limit block and the movable block are an integral component, a limit slot is provided on the inner end surface of the side straight plate corresponding to the limit block, and a pressing block is provided in the middle position of the outer end surface of the movable block.

[0010] Preferably, a limiting groove is provided at the head of the built-in block corresponding to the locking block, a mounting groove is provided behind the limiting groove, an inner vertical plate is provided at the tail of the mounting groove, a first spring is provided at the middle position of the front end surface of the inner vertical plate, and an adjustable outer vertical plate is provided at the head of the mounting groove, the length and width of the outer vertical plate are equal to that of the inner vertical plate, the head of the first spring is connected to the rear end surface of the outer vertical plate, the tail of the locking block is connected to the middle position of the front end surface of the outer vertical plate, and the outer end surface of the locking block is an arc surface.

[0011] Preferably, the built-in block and the bonding plate are fixed by welding, a cable is provided in the middle position of the rear end face of the outer vertical plate, the cable passes through the inner vertical plate, and the cable and the inner vertical plate are movably connected, a rear circular groove is provided on the rear wall of the mounting groove corresponding to the cable, the tail of the rear circular groove is connected to the rear end face of the built-in block, a guide circular groove is provided at the tail of the bonding plate corresponding to the position of the rear circular groove, the head of the cable passes through the rear circular groove and the guide circular groove and is connected to the tail of the movable block.

[0012] Preferably, a bottom groove is provided on the lower end surface of the top covering plate corresponding to the key area, fixed blocks are provided on both sides of the bottom groove on the lower end surface of the top covering plate, adjustable locking marbles are provided on the inner end surfaces of the fixed blocks, fixed slide grooves are provided on the upper end surface of the shell corresponding to the fixed blocks on both sides of the key area, a pair of locking grooves are provided on the inner wall of the fixed slide groove close to the key area corresponding to the locking marbles, and the locking grooves are respectively located at both ends of the fixed slide groove.

[0013] Preferably, a fixed circular hole is provided at the head of the fixed block corresponding to the locking marble, a rectangular groove is provided behind the fixed circular hole, the tail of the locking marble extends into the rectangular groove and is provided with a front partition, a rear partition is provided at the tail of the rectangular groove, the length and width of the front partition are equal to the rear partition, and a second spring is provided between the front partition and the rear partition.

[0014] Preferably, a pair of fixed cylinders are provided on the outer end surface of the outer plate, and the fixed cylinders and the outer plate are integral components. A spacer straight plate is provided on the outer end surface of the self-clamping plate, and positioning circular holes are provided at both ends of the spacer straight plate corresponding to the fixed cylinders. An extended straight plate is provided at the top position of the outer end surface of the spacer straight plate, and a cover plate is provided on the outer end surface of the extended straight plate. The spacer straight plate, the extended straight plate and the top of the cover plate are all at the same height, and the height of the spacer straight plate is equal to the bottom of the cover plate.

[0015] Preferably, the head of the fixed cylinder passes through the positioning circular hole and is provided with a circular sealing plate, the outer ring of the fixed cylinder is provided with an adjustable annular pressure plate, the annular pressure plate is located outside the spaced straight plate, a third spring is provided on the outer ring of the outer end face of the annular pressure plate, the third spring is located on the outer ring of the fixed cylinder, and the head of the third spring is connected to the inner end face of the circular sealing plate, and the cover plate is located outside the circular sealing plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. A quickly adjustable top cover plate is provided on the top of the shell to cover and protect the key area to avoid accidental contact. A self-clamping plate that can automatically adjust its position is provided above the card swiping slot. The self-clamping plate can effectively cover and protect the POS terminal device to avoid the mixing of dust, impurities and moisture. A quickly disassembled and assembled box is provided on the outer ring of the shell, which can be adjusted using a movable block on one side. It can be used for protection when carrying and exercising, reducing damage caused by collision and falling.

[0018] 2. A storage groove is provided on the front end of the sleeve, and a built-in block is provided on the inner wall of one side of the storage groove. An adjustable locking block is provided by the built-in block. The locking block can be used to seal and fix the outer shell after storage, thereby ensuring the stability of the POS device in the sleeve. Once the POS device is collided or dropped, the outer ring of the sleeve can effectively protect the POS device, reduce the direct impact on the outer shell, and ensure the safe and stable use of the POS device.

[0019] 3. A top cover plate that can be quickly adjusted and disassembled is set above the key area, and a fixed block is set on the lower end surface of the top cover plate. The top cover plate can be fixed by using the locking marbles on the inside of the fixed block and the locking grooves on the inner wall of the fixed slide. This allows the top cover plate to effectively shield the key area, which can prevent accidental contact, as well as dust and moisture infiltration, and prevent moisture and impurities from entering the device through the gaps in the key area.

[0020] 4. By setting an adjustable self-clamping plate above the outer plate, and setting the positions of the two ends of the inner end surface of the self-clamping plate to be arc-shaped, when swiping the card, the card can squeeze the arc surface of the self-clamping plate when passing through, causing it to automatically move, and then open the card swiping slot for quick card swiping, which can maintain both protection and convenience of card swiping.

[0021] 5. By setting a protective strip on the outer circle of the card board and using the protective strip to contact the card, it can avoid scratching the card and causing demagnetization and other problems, making the POS device more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of a locking block of the present invention;

[0024] Figure 3 It is a schematic diagram of the side straight plate of the present invention;

[0025] Figure 4 It is a schematic diagram of the splitting of the built-in blocks of the present invention;

[0026] Figure 5 It is a schematic diagram of a fixed chute of the present invention;

[0027] Figure 6 It is a schematic diagram of the top sealing plate of the present invention;

[0028] Figure 7 It is a schematic diagram of the splitting of the fixed block of the present invention;

[0029] Figure 8 It is a schematic diagram of the self-clamping board of the present invention;

[0030] Fig. 9 It is a schematic diagram of a fixed cylinder of the present invention.

[0031] In the figure: 1, shell; 2, box; 3, display screen; 4, external board; 5, card slot; 6, self-card board; 7, keypad; 8, top cover; 9, top convex board; 10, storage slot; 11, built-in block; 12, locking block; 13, fitting board; 14, built-in slot; 15, movable block; 16, pressing block; 17, side straight board; 18, limit block; 19, limit slide groove; 20, limit groove; 21, installation slot; 22, external board; 23, internal board; 24, first spring; 25. Cable; 26. Rear circular groove; 27. Guide circular groove; 28. Bottom groove; 29. ​​Fixed block; 30. Locking marble; 31. Fixed slide groove; 32. Locking groove; 33. Fixed circular hole; 34. Rectangular groove; 35. Front partition; 36. Rear partition; 37. Second spring; 38. Protection strip; 39. Spacer straight plate; 40. Extended straight plate; 41. Cover plate; 42. Fixed cylinder; 43. Positioning circular hole; 44. Circular sealing plate; 45. Annular pressure plate; 46. Third spring. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] like Figure 1-9 As shown, a portable POS terminal device includes a shell 1 and a sleeve 2, a display screen 3 is arranged at the head position of the upper end surface of the shell 1, a key area 7 is arranged at the tail position of the upper end surface of the shell 1, an outer plate 4 is arranged at the head position of the shell 1, a card swiping slot 5 is arranged on the upper end surface of the outer plate 4, a storage slot 10 is arranged on the front end surface of the sleeve 2 corresponding to the shell 1, a built-in block 11 is arranged on the inner wall of one side of the storage slot 10, an adjustable locking block 12 is arranged at the head of the built-in block 11, and the locking block 12 is located at the outer side of the shell 1, an adjustable self-clamping plate 6 is arranged at the head position of the shell 1 above the outer plate 4, and a protective strip 38 is arranged on the outer ring of the self-clamping plate 6, an adjustable top sealing plate 8 is arranged at the tail position of the upper end surface of the shell 1, and the top sealing plate 8 is located above the key area 7.

[0034] In this embodiment, in order to facilitate the adjustment of the position of the top sealing plate 8, the two ends of the inner end surface of the self-clamping plate 6 are arc surfaces, and the protective strip 38 is fixed to the outer circle position of the self-clamping plate 6 by bonding. The upper end surface of the top sealing plate 8 is at the same height as the upper end surface of the display screen 3 and the upper end surface of the self-clamping plate 6, and a top convex plate 9 is provided at the tail position of the upper end surface of the top sealing plate 8.

[0035] In the present embodiment, in order to ensure the stability of the shell 1 after being placed in the sleeve box 2, and at the same time to be able to quickly adjust the fixed state so as to facilitate the use of the shell 1, a built-in groove 14 is provided on one end surface of the sleeve box 2 corresponding to the built-in block 11, and the tail of the built-in groove 14 is connected to the storage groove 10, and the built-in block 11 is fixed to the high built-in groove 14 by bonding, and a fitting plate 13 is provided on one end surface of the sleeve box 2 at the outer position of the built-in block 11, and an adjustable movable block 15 is provided on the head of the fitting plate 13, and a side straight plate 17 is provided on the end surface of one end surface of the sleeve box 2 at the upper and lower positions of the movable block 15, and a limiting block 18 is provided on the upper and lower end surfaces of the movable block 15, and the limiting block 18 and the movable block 15 are integrally formed components, and a limiting sliding groove 19 is provided on the inner end surface of the side straight plate 17 corresponding to the limiting block 18, and a pressing block 16 is provided at the middle position of the outer end surface of the movable block 15, and a limiting groove 20 is provided on the head of the built-in block 11 corresponding to the locking block 12, and a mounting groove 20 is provided behind the limiting groove 20. The mounting groove 21 is provided with an inner vertical plate 23 at the tail of the mounting groove 21, and a first spring 24 is provided at the middle position of the front end surface of the inner vertical plate 23. The head of the mounting groove 21 is provided with an adjustable outer vertical plate 22. The length and width of the outer vertical plate 22 and the inner vertical plate 23 are equal. The head of the first spring 24 is connected to the rear end surface of the outer vertical plate 22. The tail of the locking block 12 is connected to the middle position of the front end surface of the outer vertical plate 22. The outer end surface of the locking block 12 is an arc surface. The inner block 11 and the bonding plate 13 are welded together. For fixation, a cable 25 is provided in the middle position of the rear end surface of the outer vertical plate 22, and the cable 25 passes through the inner vertical plate 23, and the cable 25 and the inner vertical plate 23 are movably connected. A rear circular groove 26 is provided on the rear wall of the mounting groove 21 corresponding to the cable 25, and the tail of the rear circular groove 26 is connected to the rear end surface of the built-in block 11, and a guide circular groove 27 is provided at the tail of the fitting plate 13 corresponding to the position of the rear circular groove 26. The head of the cable 25 passes through the rear circular groove 26 and the guide circular groove 27 and is connected to the tail of the movable block 15.

[0036] In this embodiment, in order to ensure the stability of the top sealing plate 8 after installation, a bottom groove 28 is provided on the lower end surface of the top sealing plate 8 corresponding to the key area 7, and a fixing block 29 is provided on the lower end surface of the top sealing plate 8 at both sides of the bottom groove 28. An adjustable locking marble 30 is provided on the inner end surface of the fixing block 29, and a fixed slide 31 is provided on the upper end surface of the housing 1 at both sides of the key area 7 corresponding to the fixed block 29. The inner wall of the fixed slide 31 close to the key area 7 corresponds to the locking marble 30. A pair of locking grooves 32 are provided, and the locking grooves 32 are respectively located at the two ends of the fixed slide groove 31. A fixed circular hole 33 is provided at the head of the fixed block 29 corresponding to the locking ball 30, and a rectangular groove 34 is provided behind the fixed circular hole 33. The tail of the locking ball 30 extends into the rectangular groove 34 and is provided with a front partition 35. A rear partition 36 is provided at the tail of the rectangular groove 34. The length and width of the front partition 35 are equal to those of the rear partition 36. A second spring 37 is provided between the front partition 35 and the rear partition 36.

[0037] In this embodiment, in order to enable the self-card plate 6 to automatically adjust its position when swiping the card, a pair of fixed cylinders 42 are provided on the outer end surface of the outer plate 4, and the fixed cylinders 42 and the outer plate 4 are integral components. A spacer straight plate 39 is provided on the outer end surface of the self-card plate 6, and positioning holes 43 are provided at both ends of the spacer straight plate 39 corresponding to the fixed cylinders 42. An extension straight plate 40 is provided at the top position of the outer end surface of the spacer straight plate 39, and a cover plate 41 is provided on the outer end surface of the extension straight plate 40. The tops of the spacer straight plate 39, the extension straight plate 40 and the cover plate 41 are all They are at the same height, and the spacing straight plate 39 is at the same height as the bottom of the cover plate 41. The head of the fixed cylinder 42 passes through the positioning circular hole 43 and is provided with a circular sealing plate 44. The outer ring of the fixed cylinder 42 is provided with an adjustable annular pressure plate 45. The annular pressure plate 45 is located at the outer side of the spacing straight plate 39. A third spring 46 is provided at the outer ring of the outer end face of the annular pressure plate 45. The third spring 46 is located at the outer ring of the fixed cylinder 42, and the head of the third spring 46 is connected to the inner end face of the circular sealing plate 44. The cover plate 41 is located at the outer side of the circular sealing plate 44.

[0038] It should be noted that the present invention is a POS terminal device that is easy to carry. In actual use, the top cover plate 8 above the housing 1 can be found and pushed downward, so that it drives the connected fixing block 29 to move along the fixing slide 31. The fixing block 29 simultaneously drives the inner locking marble 30 to move, so that the locking marble 30 escapes from the locking groove 32 and is squeezed and shrinks inward during the movement. When the locking marble 30 shrinks, it squeezes the rear front partition 35, and the front partition 35 squeezes the rear second spring 37, so that the second spring 37 is compressed by force until the locking marble 30 is released. The ball 30 is completely retracted, and then the top sealing plate 8 is pushed to move to the maximum extent, so that the locking marble 30 reaches the locking groove 32 at the other end. At this time, the key area 7 above the shell 1 is exposed, and the pressing operation can be performed. When swiping the card, the card can be directly pressed on any end of the card plate 6, thereby squeezing the arc surface of the card plate 6 to move outward. The card plate 6 moves outward along the fixed cylinders 42 at both ends and squeezes the outer annular pressure plate 45 during the movement. The annular pressure plate 45 moves along the fixed cylinder 42 and squeezes the connected third spring 46, so that it is compressed by force. , until the card completely passes through the card swiping slot 5, the card swiping is completed. After the card is swiped out, the self-card plate 6 is reset under the action of elastic force; when the device needs to be carried and moved, the top sealing plate 8 is first moved back to its original position, and then the shell 1 is aligned with the storage slot 10 at the head of the sleeve 2 for installation. When the shell 1 moves, the arc surface of the locking block 12 on the inner wall of one side is squeezed to make it shrink inward, and the locking block 12 squeezes the outer plate 22 and the first spring 24 at the rear, so that the first spring 24 is compressed by force until the locking block 12 is completely contracted, and then the shell 1 is pushed to move to the bottom. At this time, the locking block 12 reaches the outer side of the shell 1 and extends out under the action of elastic force, thereby preventing the shell 1 from falling out. The shell 1 can be protected by the sleeve 2. When the shell 1 needs to be taken out, the movable block 15 on one side of the sleeve 2 can be pushed to drive the connected cable 25 to move, and the cable 25 drives the outer plate 22 connected to the other end to move. The outer plate 22 then squeezes the first spring 24 at the rear, causing it to be compressed by force. At the same time, the outer plate 22 drives the connected locking block 12 to move, causing it to fully retract. Then the shell 1 can be taken out and used quickly.

[0039] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A portable POS terminal device, comprising a housing (1) and a case (2), wherein a display screen (3) is provided at the head position of the upper end surface of the housing (1), a keypad area (7) is provided at the tail position of the upper end surface of the housing (1), an outer plate (4) is provided at the head position of the housing (1), and a card swiping slot (5) is provided at the upper end surface of the outer plate (4), characterized in that: The front end surface of the sleeve (2) is provided with a storage groove (10) corresponding to the shell (1), and the inner wall of one side of the storage groove (10) is provided with a built-in block (11), and the head of the built-in block (11) is provided with an adjustable locking block (12), and the locking block (12) is located at the outer side of the shell (1). The head of the shell (1) is provided with an adjustable self-clamping plate (6) above the outer plate (4), and the outer ring of the self-clamping plate (6) is provided with a protective strip (38). The tail position of the upper end surface of the shell (1) is provided with an adjustable top sealing plate (8), and the top sealing plate (8) is located above the key area (7). The end surface of one side of the sleeve (2) is provided with a built-in groove (14), and the The tail of the built-in groove (14) is connected to the storage groove (10), the built-in block (11) is fixed to the high built-in groove (14) by bonding, a bonding plate (13) is arranged on one end surface of the sleeve box (2) at the outer position of the built-in block (11), and an adjustable movable block (15) is arranged on the head of the bonding plate (13), and a side straight plate (17) is arranged on one end surface of the sleeve box (2) at the upper and lower positions of the movable block (15), and the upper and lower end surfaces of the movable block (15) are provided with a limit block (18), and the limit block (18) and the movable block (15) are integrally formed components, and a limit sliding groove (19) is arranged on the inner end surface of the side straight plate (17) corresponding to the limit block (18), and the movable block (1 5) A pressing block (16) is provided at the middle position of the outer end surface, a limiting groove (20) is provided at the head of the built-in block (11) corresponding to the locking block (12), a mounting groove (21) is provided behind the limiting groove (20), an inner vertical plate (23) is provided at the tail of the mounting groove (21), a first spring (24) is provided at the middle position of the front end surface of the inner vertical plate (23), an adjustable outer vertical plate (22) is provided at the head of the mounting groove (21), the length and width of the outer vertical plate (22) and the inner vertical plate (23) are equal, the head of the first spring (24) is connected to the rear end surface of the outer vertical plate (22), the tail of the locking block (12) is connected to the middle position of the front end surface of the outer vertical plate (22), and the locking block (12) The outer end surface is an arc surface, the built-in block (11) and the bonding plate (13) are fixed by welding, a cable (25) is arranged at the middle position of the rear end surface of the outer vertical plate (22), the cable (25) passes through the inner vertical plate (23), and the cable (25) and the inner vertical plate (23) are movably connected, a rear circular groove (26) is arranged on the rear wall of the installation groove (21) corresponding to the cable (25), the tail of the rear circular groove (26) is connected to the rear end surface of the built-in block (11), a guide circular groove (27) is arranged at the tail of the bonding plate (13) corresponding to the position of the rear circular groove (26), the head of the cable (25) passes through the rear circular groove (26), the guide circular groove (27) and is connected to the tail of the movable block (15); When the device needs to be carried and moved, the top cover plate (8) is first moved back to its original position, and then the outer shell (1) is aligned with the storage slot (10) at the head of the sleeve (2) for installation. When the outer shell (1) moves, the arc surface of the locking block (12) on the inner wall of one side is squeezed to make it shrink inward, and the locking block (12) squeezes the outer plate (22) and the first spring (24) at the rear, so that the first spring (24) is compressed by force until the locking block (12) is completely contracted, and then the outer shell (1) is pushed to move to the bottom of the sleeve (2). At this time, the locking block (12) reaches the outer side of the outer shell (1) and is The outer shell (1) is extended under the action of elastic force, thereby preventing the outer shell (1) from falling out. The sleeve (2) can be used to protect the outer shell (1). When it is necessary to remove the outer shell (1), the movable block (15) on one side of the sleeve (2) can be pushed to drive the connected cable (25) to move. The cable (25) drives the outer plate (22) connected to the other end to move. The outer plate (22) then squeezes the first spring (24) at the rear, causing it to be compressed. The outer plate (22) simultaneously drives the connected locking block (12) to move, causing it to completely retract. Then the outer shell (1) can be removed and quickly used.

2. A portable POS terminal device according to claim 1, characterized in that: The inner end surface of the self-clamping plate (6) has arc surfaces at both ends, the protective strip (38) is fixed to the outer ring of the self-clamping plate (6) by bonding, the upper end surface of the top sealing plate (8) is at the same height as the upper end surface of the display screen (3) and the upper end surface of the self-clamping plate (6), and a top convex plate (9) is provided at the tail of the upper end surface of the top sealing plate (8).

3. A portable POS terminal device according to claim 1, characterized in that: The lower end surface of the top cover plate (8) is provided with a bottom groove (28) corresponding to the key area (7), the lower end surface of the top cover plate (8) is provided with fixed blocks (29) at both sides of the bottom groove (28), the inner end surface of the fixed block (29) is provided with an adjustable locking marble (30), the upper end surface of the housing (1) is provided with a fixed slide groove (31) at both sides of the key area (7) corresponding to the fixed block (29), the inner wall of the fixed slide groove (31) close to the key area (7) is provided with a pair of locking grooves (32) corresponding to the locking marble (30), and the locking grooves (32) are respectively located at both ends of the fixed slide groove (31).

4. A portable POS terminal device according to claim 3, characterized in that: A fixing circular hole (33) is provided at the head of the fixing block (29) corresponding to the locking marble (30), a rectangular groove (34) is provided behind the fixing circular hole (33), the tail of the locking marble (30) extends into the rectangular groove (34) and is provided with a front baffle (35), a rear baffle (36) is provided at the tail of the rectangular groove (34), the length and width of the front baffle (35) and the rear baffle (36) are equal, and a second spring (37) is provided between the front baffle (35) and the rear baffle (36).

5. The portable POS terminal device according to claim 1, characterized in that: A pair of fixed cylinders (42) are arranged on the outer end surface of the outer plate (4), and the fixed cylinders (42) and the outer plate (4) are integral components. A spacer straight plate (39) is arranged on the outer end surface of the self-clamping plate (6), and positioning circular holes (43) are arranged at both ends of the spacer straight plate (39) corresponding to the fixed cylinders (42). An extension straight plate (40) is arranged at the top position of the outer end surface of the spacer straight plate (39), and a cover plate (41) is arranged on the outer end surface of the extension straight plate (40). The tops of the spacer straight plate (39), the extension straight plate (40) and the cover plate (41) are all at the same height, and the bottom heights of the spacer straight plate (39) and the cover plate (41) are equal.

6. The portable POS terminal device according to claim 5, characterized in that: The head of the fixed cylinder (42) passes through the positioning circular hole (43) and is provided with a circular sealing plate (44); the outer ring of the fixed cylinder (42) is provided with an adjustable annular pressure plate (45); the annular pressure plate (45) is located outside the spaced straight plate (39); a third spring (46) is provided at the outer ring position of the outer end surface of the annular pressure plate (45); the third spring (46) is located at the outer ring of the fixed cylinder (42); the head of the third spring (46) is connected to the inner end surface of the circular sealing plate (44); and the cover plate (41) is located outside the circular sealing plate (44).

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