CN210226013U - Programmable controller - Google Patents

Abstract

The utility model provides a programmable controller, which relates to the technical field of electronic products and comprises a main unit and a plurality of extension units which can be arranged in a stacking way, wherein the main unit and the extension units respectively comprise an upper cover and a lower cover which are matched with each other in a buckling way, and the upper cover and the lower cover are mutually buckled to form a box-shaped shell; the planes of the box-shaped shells which are mutually laminated and attached are attachment end faces; a guide assembly and a bolt assembly are arranged between the joint end faces of the main unit and the expansion units which are mutually laminated and jointed and between the joint end faces of the expansion units which are mutually laminated and jointed, and the guide assembly comprises a plurality of guide columns and hole position grooves; the bolt component is detachably arranged between two adjacent box-shaped shells in a penetrating way. Wear to locate between two adjacent box-like casings through bolt subassembly detachable, cooperation direction subassembly makes dismantled and assembled laminating fixed between the laminating terminal surface, has guaranteed compact laminating and dismantled and assembled fixed between each modular unit, and the dismouting after the position adjustment between the modular unit of being convenient for and the adjustment is fixed.

Description

Programmable controller

Technical Field

The utility model relates to an electronic product technical field particularly, relates to a programmable controller.

Background

A Programmable Logic Controller (PLC) is a novel industrial automation control device, and has been widely used in various industries such as factory informatization, tunnel control, urban illumination, and the like. With the continuous improvement of the control system on the protection level of each single machine environment, the original industrial programmable controller has the advantages of large volume, complex structure, poor reliability and single function, can not meet the requirements of the existing protection level of the environment, and has obvious problems particularly in the severe working environments such as mechanical vibration, environmental temperature, electromagnetic interference and the like.

The cooperation mode between each functional module in programmable controllers on the market at present is generally realized by fixedly mounting the mutually associated functional modules in the same controller on the same mounting seat, so as to facilitate the mutual relation between each functional module. However, such a fixing and mounting manner is complicated, and is not favorable for position adjustment between the functional modules, and the cooperation between the modules is not compact enough, and the stability is low.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a programmable controller, compact structure aims at improving the more loaded down with trivial details problem of cooperation between each functional module in the programmable controller.

The utility model adopts the following scheme:

a programmable controller consists of a main unit and a plurality of extension units which can be stacked, wherein the main unit and the extension units respectively comprise an upper cover and a lower cover which are in snap fit, and the upper cover and the lower cover are mutually buckled to form a box-shaped shell; the planes of the box-shaped shells which are mutually laminated and attached are attachment end faces, and the attachment end faces are the same in size and are matched with each other; a guide assembly and a plug pin assembly are arranged between the joint end faces of the main unit and one of the extension units which are mutually laminated and jointed and between the joint end faces of the extension units which are mutually laminated and jointed, the guide assembly comprises a plurality of guide columns and hole site grooves matched with the guide columns, and the guide columns and the hole site grooves are respectively arranged on the joint end faces of different box-shaped shells at the same laminated joint end; the bolt component is detachably arranged between two adjacent box-shaped shells in a penetrating mode so as to be matched with the guide component to enable the joint end faces of the adjacent box-shaped shells to be detachably jointed and fixed.

As a further improvement, each box-shaped shell is provided with two oppositely arranged first side surfaces and two oppositely arranged second side surfaces which are perpendicular to the joint end surfaces, and the joint end surfaces, the first side surfaces and the second side surfaces are used for enclosing the box-shaped shell; bolt subassembly sets up in adjacent two box-like casing on the first side, and lie in two with one side the hookup location of first side, two are adjacent box-like casing is in the bolt subassembly inserts and is equipped with protruding piece and the sunken mouth of mutual adaptation on establishing corresponding position respectively, bolt subassembly slidable is arranged in sunken mouth is with following sunken mouth is outside or inside removal corresponds the chucking or is kept away from protruding piece.

As a further improvement, the bolt subassembly is including pressing the head and removing the tip, it slides and arranges in to remove the tip the cave mouth, press the head to be close to the one end of removing the tip is equipped with the butt plate, one side outside leaning on of protruding piece has an L type hook block, protruding piece is arranged in when in the cave mouth, the bolt subassembly inwards removes the drive press the butt plate of head with the mutual butt locking of L type hook block.

As a further improvement, one of the second side surfaces of each box-shaped shell is provided with a sliding groove which is matched with an external guide rail, the sliding groove is arranged in the middle area of the second side surface and transversely penetrates through the second side surface, and the sliding grooves of each box-shaped shell are positioned on the second side surface on the same side and are mutually communicated; but one of them side of spout both sides is equipped with the guide rail buckle that moves about the side direction and with the spacing seat of guide rail buckle cooperation chucking, the guide rail buckle has the ready condition of keeping away from mutually with outside guide rail and the operating condition that leans on that supports, and is in ready condition or operating condition, the guide rail buckle homogeneous phase is arranged in to the extrusion chucking spacing seat.

As a further improvement, the guide rail buckle is composed of a buckle body and elastic positioning needles, the limiting seat is provided with a triangular rib block which is abutted and clamped with the elastic positioning needles, the buckle body is slidably arranged in the limiting seat, the elastic positioning needles are provided with two relatively independent parts and are relatively bent along the direction close to the triangular rib block, and the buckle body is moved to drive the elastic positioning needles to be relatively abutted or fastened to the triangular rib block so as to correspond to the guide rail buckle in a working state or a preparation state.

As a further improvement, a pre-tightening block is further arranged on the limiting seat, the pre-tightening block is arranged in the triangular rib block, and when the guide rail buckle is in a preparation state, the buckle body is abutted against the pre-tightening block so as to prevent the buckle body from being separated from the limiting seat.

As a further improvement, one end of the upper cover, which is fastened with the lower cover, is provided with a plurality of hooks, the hooks are annularly arranged on the periphery of the lower end of the upper cover, the lower cover is provided with hook grooves matched with the hooks, and the end parts of the hooks have an inclined taper and incline towards the inner side.

As a further improvement, the outer sides of the box-shaped shells are respectively provided with regularly arranged heat dissipation guide grooves and convection heat dissipation holes communicated with the interiors of the box-shaped shells; the heat dissipation guide grooves are transversely arranged on the outer surface of the box-shaped shell, the heat dissipation guide grooves on all the surfaces are communicated with each other, and the convection heat dissipation holes are arranged in part of the heat dissipation guide grooves to be matched with the heat dissipation guide grooves to dissipate heat jointly.

As a further improvement, a plurality of wiring terminals and a plurality of interfaces are arranged on the box-shaped shell.

As a further improvement, a CPU board, an IO board and a signal lamp are arranged inside the box-shaped shell and are electrically connected.

By adopting the technical scheme, the utility model discloses can gain following technological effect:

the utility model provides a programmable controller, through setting up direction subassembly and the bolt subassembly on the laminating terminal surface between the box-like casing, make between each box-like casing at range upon range of laminating in-process, be located mutually supporting between guide post and the hole site groove of different laminating terminal surfaces, provide the guide effect for laminating each other between the box-like casing, wear to locate between two adjacent box-like casings by bolt subassembly detachable, cooperation direction subassembly makes dismantled and assembled laminating fixed between the laminating terminal surface, compact laminating and dismantled and assembled fixed between main unit and each extension unit have been guaranteed, stable in structure is reliable, it is fixed to be convenient for position adjustment between the module unit and the dismouting after the adjustment.

Further, the bolt subassembly sets up in the hookup location of two adjacent first sides, two adjacent box-like casings are equipped with protruding piece and the sunken mouth of mutual adaptation on the bolt subassembly inserts the corresponding position of establishing respectively, the bolt subassembly is slided and is arranged in the sunken mouth to outwards or inwards remove along the sunken mouth and correspond the chucking or keep away from protruding piece, make two adjacent box-like casings pass through bolt subassembly relative chucking locking in the laminating position, it is fixed to have guaranteed dismantled and assembled between the modular unit, made things convenient for the dismouting process.

Furthermore, a sliding groove is formed in the second side face of the box-shaped shell, a guide rail buckle and a limiting seat are arranged on the side face of the sliding groove, the guide rail buckle moves left and right on the limiting seat, the guide rail buckle is enabled to have a preparation state which is far away from an external guide rail and a working state which is abutted against the preparation state, the relative clamping is arranged on the limiting seat, the guide rail buckle is abutted against the external rail, the box-shaped shell is relatively fixed on the external rail, and the box-shaped shell is guaranteed to be stably arranged on the external rail.

Furthermore, the box-shaped shell is provided with a heat dissipation guide groove and convection heat dissipation holes formed in part of the heat dissipation guide groove, and the heat dissipation guide groove and the convection heat dissipation holes are matched with each other, so that effective heat dissipation inside the box-shaped shell is guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a programmable controller according to an embodiment of the present invention, in which a right side is a disassembled schematic diagram of a left side;

FIG. 2 is an enlarged schematic view of the right side of FIG. 1;

FIG. 3 is an exploded view of the upper and lower covers of the box-like housing of FIG. 1;

FIG. 4 is a cross-sectional view of the box-like housing of FIG. 1 with the upper and lower covers mated;

fig. 5 is a schematic structural diagram of a box-shaped housing of the programmable controller according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a rail clip of a programmable controller according to an embodiment of the present invention, in which the rail clip on the left side is in an operating state, and the rail clip on the right side is in a ready state;

fig. 7 is a schematic diagram of the programmable controller and the external guide rail according to the embodiment of the present invention;

fig. 8 is a schematic diagram of the programmable controller and the external guide rail according to another view angle;

fig. 9 is a schematic diagram illustrating the disassembly of the box-shaped housing of the programmable controller according to the embodiment of the present invention, wherein the right side is a disassembled state diagram.

Icon: 1-a master unit; 2-an extension unit; 3-covering the cover; 4-lower cover; 5-box-shaped shell; 6-trip; 7-hooking grooves; 8-fitting end faces; 9-a guide assembly; 10-a latch assembly; 11-a guide post; 12-a pore space groove; 13-a first side; 14-a second side; 15-raised blocks; 16-a recessed port; 17-pressing the head; 18-moving the end; 19-an abutment plate; 20-L type hook block; 21-a chute; 22-guide rail fastening; 23-a limiting seat; 24-a buckle body; 25-an elastic positioning pin; 26-triangular rib blocks; 27-a pre-tensioning block; 28-heat dissipation diversion trenches; 29-convection heat dissipation holes; 30-a connecting terminal; 31-an interface; 32-a CPU board; 33-IO board; 34-signal lamp.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. 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 work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Examples

In conjunction with fig. 1, 7 and 8, the present embodiment provides a programmable controller, which is composed of a main unit 1 and a plurality of extension units 2 that can be stacked.

Referring to fig. 3 and 4, the main unit 1 and the expansion unit 2 each include an upper cover 3 and a lower cover 4 that are snap-fitted, the upper cover 3 and the lower cover 4 are fastened to each other to form a box-shaped housing 5, and the main unit 1 and the expansion unit 2 are box-shaped. In this embodiment, a plurality of hooks 6 are disposed at one end of the upper cover 3 and the lower cover 4, the hooks 6 are disposed around the lower end of the upper cover 3, and the lower cover 4 is disposed with a hook slot 7 adapted to the hooks 6. Preferably, the end of the hook 6 has an inclined taper and is inclined towards the inside, so as to facilitate the mutual fastening and the relative detachment of the upper cover 3 and the lower cover 4.

Referring to fig. 1 and 2, the planes on which the box-shaped housings 5 are stacked and attached to each other are the attaching end faces 8, and the sizes of the attaching end faces 8 are the same to be matched with each other, that is, the sizes of the main unit 1 and the expansion unit 2 on the plane of the attaching side are the same, which facilitates the attaching and matching of the main unit 1 and the expansion unit 2 and the synchronous installation of each module unit. And a guide assembly 9 and a plug pin assembly 10 are arranged between the joint end faces 8 of the main unit 1 and one of the expansion units 2 which are mutually laminated and attached and between the joint end faces 8 of the plurality of expansion units 2 which are mutually laminated and attached. The guide assembly 9 includes a plurality of guide posts 11 and hole site slots 12 adapted to the guide posts 11. The guide posts 11 and the hole site grooves 12 are respectively arranged on the joint end faces 8 of different box-shaped shells 5 at the same laminated joint end. The bolt component 10 is detachably arranged between two adjacent box-shaped shells 5 in a penetrating way so as to be matched with the guide component 9 to enable the joint end faces 8 of the adjacent box-shaped shells 5 to be detachably jointed and fixed. Through setting up direction subassembly 9 and bolt subassembly 10 on laminating terminal surface 8 between box-like casing 5, make each box-like casing 5 at range upon range of laminating in-process, be located and mutually support between guide post 11 and the hole position groove 12 of the laminating terminal surface 8 of different box-like casings 5, for laminating each other between box-like casing 5 provides the guide effect, wear to locate between two adjacent box-like casings 5 by bolt subassembly 10 detachable, cooperation direction subassembly 9 makes dismantled and assembled laminating fixed between the laminating terminal surface 8, compact laminating and dismantled and assembled fixed between main unit 1 and each expansion unit 2 have been guaranteed, and stable in structure is reliable, be convenient for position adjustment between the module unit and the dismouting after the adjustment are fixed.

Referring to fig. 2, 5 and 7, each box-shaped housing 5 has two opposite first side surfaces 13 and two opposite second side surfaces 14 perpendicular to the abutting end surface 8. The end face 8, the first side face 13 and the second side face 14 are attached to enclose a box-like housing 5. The latch pin assembly 10 is disposed on the first sides 13 of two adjacent box-like housings 5 at the connecting position of the two first sides 13 on the same side. In this embodiment, two latch assemblies 10 are symmetrically disposed at the connecting positions of two first side surfaces 13 disposed oppositely. The two adjacent box-shaped shells 5 are respectively provided with mutually matched convex blocks 15 and concave openings 16 at the corresponding positions where the bolt assemblies 10 are inserted, and the bolt assemblies 10 can be slidably arranged in the concave openings 16 so as to move outwards or inwards along the concave openings 16 to be correspondingly clamped or away from the convex blocks 15. Specifically, the latch assembly 10 includes a pressing head 17 and a moving end 18, the moving end 18 is slidably disposed in the recessed opening 16, an abutting plate 19 is disposed at an end of the pressing head 17 close to the moving end 18, an L-shaped hook block 20 is disposed at an outer side of the protruding block 15, and when the protruding block 15 is disposed in the recessed opening 16, the latch assembly 10 moves inward to drive the abutting plate 19 of the pressing head 17 and the L-shaped hook block 20 to abut against each other and lock. Set up in the hookup location of two adjacent first sides 13 through bolt subassembly 10, two adjacent box-like casing 5 are equipped with protruding piece 15 and the sunken mouth 16 of mutual adaptation on bolt subassembly 10 inserts the corresponding position of establishing respectively, bolt subassembly 10 slidable arranges sunken mouth 16 in, correspond the chucking or keep away from protruding piece 15 along sunken mouth 16 outside or inside removal, make two adjacent box-like casing 5 pass through bolt subassembly 10 relative chucking locking in the laminating position, it is fixed to have guaranteed dismantled and assembled between the modular unit, the dismouting process has been made things convenient for.

Referring to fig. 3, 5, 6 and 7, a sliding groove 21 adapted to the external guide rail is formed on one of the second side surfaces 14 of each box-shaped housing 5, the sliding groove 21 is formed in the middle area of the second side surface 14 and traverses the second side surface 14, and the sliding grooves 21 of each box-shaped housing 5 are located on the second side surface 14 on the same side and are mutually communicated. In this embodiment, one of two sides of the sliding groove 21 is provided with a guide rail buckle 22 capable of moving laterally and leftwards and rightwards and a limiting seat 23 matched and clamped with the guide rail buckle 22, the guide rail buckle 22 has a preparation state of being away from an external guide rail and an abutting working state, and when the guide rail buckle 22 is in the preparation state or the working state, the guide rail buckle 22 is relatively squeezed and clamped in the limiting seat 23. Specifically, the guide rail buckle 22 is composed of a buckle body 24 and an elastic positioning pin 25, the limiting seat 23 is provided with a triangular rib block 26 which is tightly abutted against the elastic positioning pin 25, and the buckle body 24 is slidably arranged in the limiting seat 23. Preferably, the rail clip 22 has two independent elastic positioning pins 25, and is relatively bent in a direction approaching to the triangular rib block 26, and the clip body 24 is moved to bring the elastic positioning pins 25 into relatively abutting or fastening contact with the triangular rib block 26, so as to be in a working state or a preparation state corresponding to the rail clip 22.

Furthermore, the limiting seat 23 is further provided with a pre-tightening block 27, the pre-tightening block 27 is arranged in the leaning position relative to the triangular rib block 26, and when the guide rail buckle 22 is in the preparation state, the buckle body 24 is leaned against the pre-tightening block 27 so as to prevent the buckle body 24 from being separated from the limiting seat 23. The guide rail buckle 22 moves left and right on the limiting seat 23, so that the guide rail buckle 22 has a preparation state far away from the external guide rail and a working state abutting against the external guide rail, and is relatively clamped and arranged on the limiting seat. The guide rail buckle 22 is abutted to the outer rail, so that the box-shaped shell 5 is relatively fixed on the outer rail, and the box-shaped shell 5 is stably arranged on the outer rail.

Referring to fig. 3, the box-shaped casing 5 is provided with heat dissipation channels 28 and convection heat dissipation holes 29 on the outside thereof. The heat dissipation guiding gutter 28 transversely arranges in the surface of box-like casing 5, and the heat dissipation guiding gutter 28 on each face communicates each other, and convection heat dissipation hole 29 arranges in partial heat dissipation guiding gutter 28 to the cooperation heat dissipation guiding gutter 28 dispels the heat jointly, has guaranteed the convection heat dissipation hole 29 that the inside heat source accessible of box-like casing 5 was seted up, discharges to the outside of box-like casing 5 via heat dissipation guiding gutter 28, plays effectual radiating action.

Referring to fig. 9, the box-shaped housing 5 is provided with a plurality of terminals 30 and a plurality of connectors 31, the terminals 30 are detachably disposed on the surface of the box-shaped housing 5, and the connectors 31 are connected to the inside of the box-shaped housing 5 for facilitating communication between the module units. The box-shaped shell is internally provided with a CPU board 32, an IO board 33 and a signal lamp 34, and the CPU board 32, the IO board 33 and the signal lamp 34 are all electrically connected.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection.

Claims (10)

1. A programmable controller consists of a main unit and a plurality of extension units which can be stacked, and is characterized in that the main unit and the extension units respectively comprise an upper cover and a lower cover which are in snap fit, and the upper cover and the lower cover are mutually buckled to form a box-shaped shell; the planes of the box-shaped shells which are mutually laminated and attached are attachment end faces, and the attachment end faces are the same in size and are matched with each other; a guide assembly and a plug pin assembly are arranged between the joint end faces of the main unit and one of the extension units which are mutually laminated and jointed and between the joint end faces of the extension units which are mutually laminated and jointed, the guide assembly comprises a plurality of guide columns and hole site grooves matched with the guide columns, and the guide columns and the hole site grooves are respectively arranged on the joint end faces of different box-shaped shells at the same laminated joint end; the bolt component is detachably arranged between two adjacent box-shaped shells in a penetrating mode so as to be matched with the guide component to enable the joint end faces of the adjacent box-shaped shells to be detachably jointed and fixed.

2. The programmable controller of claim 1, wherein each of said box-like housings has two oppositely disposed first sides and two oppositely disposed second sides perpendicular to said abutting end faces, first sides and second sides enclosing said box-like housings; bolt subassembly sets up in adjacent two box-like casing on the first side, and lie in two with one side the hookup location of first side, two are adjacent box-like casing is in the bolt subassembly inserts and is equipped with protruding piece and the sunken mouth of mutual adaptation on establishing corresponding position respectively, bolt subassembly slidable is arranged in sunken mouth is with following sunken mouth is outside or inside removal corresponds the chucking or is kept away from protruding piece.

3. The programmable controller according to claim 2, wherein the latch assembly comprises a pressing head and a moving end, the moving end is slidably disposed in the recess, an abutting plate is disposed at an end of the pressing head close to the moving end, an L-shaped hook block is disposed at an outer side of the protruding block, and when the protruding block is disposed in the recess, the latch assembly moves inward to drive the abutting plate of the pressing head and the L-shaped hook block to abut against each other and lock.

4. The programmable controller according to claim 2, wherein one of the second side surfaces of each of the box-like housings is provided with a sliding groove adapted to an external guide rail, the sliding groove is provided in a middle region of the second side surface and traverses the second side surface, and the sliding grooves of each of the box-like housings are located on the second side surface on the same side and are mutually communicated; but one of them side of spout both sides is equipped with the guide rail buckle that moves about the side direction and with the spacing seat of guide rail buckle cooperation chucking, the guide rail buckle has the ready condition of keeping away from mutually with outside guide rail and the operating condition that leans on that supports, and is in ready condition or operating condition, the guide rail buckle homogeneous phase is arranged in to the extrusion chucking spacing seat.

5. The programmable controller according to claim 4, wherein the guide rail buckle comprises a buckle body and two elastic positioning pins, the limiting seat has a triangular rib block abutting and clamped with the elastic positioning pins, the buckle body is slidably disposed in the limiting seat, the two elastic positioning pins are relatively independent, and are relatively bent along a direction close to the triangular rib block, and the buckle body is moved to drive the elastic positioning pins to abut or buckle to the triangular rib block relatively so as to be in a working state or a preparation state corresponding to the guide rail buckle.

6. The programmable controller according to claim 5, wherein the limit seat is further provided with a pre-tightening block, the pre-tightening block is arranged in the triangular rib block, and when the guide rail buckle is in a ready state, the buckle body abuts against the pre-tightening block to prevent the buckle body from separating from the limit seat.

7. The programmable controller according to claim 1, wherein the upper cover and the lower cover are fastened together to form a plurality of hooks, the plurality of hooks are disposed around the periphery of the lower end of the upper cover, the lower cover is provided with hook slots adapted to the hooks, and the end of the hooks has an inclined taper and is inclined inward.

8. The programmable controller according to claim 1, wherein the box-shaped housing is provided with heat dissipation channels arranged regularly and convection heat dissipation holes communicated to the inside of the box-shaped housing; the heat dissipation guide grooves are transversely arranged on the outer surface of the box-shaped shell, the heat dissipation guide grooves on all the surfaces are communicated with each other, and the convection heat dissipation holes are arranged in part of the heat dissipation guide grooves to be matched with the heat dissipation guide grooves to dissipate heat jointly.

9. The programmable controller according to claim 1, wherein a plurality of terminals and a plurality of interfaces are provided on the box-like housing.

10. The programmable controller according to claim 9, wherein the box-shaped housing is provided therein with a CPU board, an IO board, and a signal lamp, which are electrically connected.

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