Scraping type ferromagnetic impurity separation device

Abstract

The present invention provides a ferromagnetic impurity separation device, which has a main shell for defining a material flow path for material flow and an action path. A secondary shell is adjacent to the main shell. A plurality of magnetic grid units are sequentially stacked on the main shell and the secondary shell. Each magnetic grid unit has a frame coupled to the main shell and the secondary shell in a manner that can move along the action path. A plurality of magnetic parts are fixed to the frame, and each magnetic part has a magnetic area and a non-magnetic area. A scraper assembly is coupled to each magnetic part and the frame in a manner that can move only within the space defined by the secondary shell, so as to scrape off ferromagnetic impurities in the material flow in a two-stage manner.

Description

Technical Field

[0001] The present invention relates to a device for separating ferromagnetic impurities in a material flow, and more particularly to a ferromagnetic impurity separation device for scraping off ferromagnetic impurities in a two-stage manner. Background Art

[0002] U.S. Patent No. 4,867,869 discloses a drawer-type ferromagnetic impurity separation device, which mainly fixes a plurality of parallel non-magnetic sleeves on a frame, and then accommodates a detachable magnetic rod in each non-magnetic sleeve. When each magnetic rod is located in each non-magnetic sleeve, the surface of each non-magnetic sleeve can adsorb ferromagnetic impurities in the material flow, and when each magnetic rod is separated from each non-magnetic sleeve, the ferromagnetic impurities adsorbed on the surface of each non-magnetic sleeve will automatically fall off. The main disadvantage of this device is that the ferromagnetic impurities in the material flow are indirectly adsorbed by each magnetic rod, so the adsorption capacity of each magnetic rod cannot be fully exerted. Furthermore, the aforementioned device uses an automatic falling method to remove the ferromagnetic impurities adsorbed on the surface of each non-magnetic sleeve, so it is impossible to remove all ferromagnetic impurities.

[0003] In addition, U.S. Patent No. 6,902,066 discloses another structure of a drawer-type ferromagnetic impurity separation device, which mainly arranges a group of magnetic bars on a body, and allows the group of magnetic bars to move back and forth inside and outside the body. When the group of magnetic bars is located in the body, it can absorb the ferromagnetic impurities in the material flow passing through the body. When the group of magnetic bars is located outside the body, a scraper arranged on the group of magnetic bars is used to scrape off the ferromagnetic impurities adsorbed on each magnetic bar. This device uses magnetic bars to directly absorb ferromagnetic impurities in the material flow, so it can solve the problem of U.S. Patent No. 4,867,869, but there are still some disadvantages. First, the body of the device is directly coupled to the magnetic bar group, so it will be disturbed by magnetic force when moving the magnetic bar group. Furthermore, when the magnetic bar group is pulled out, the device must be temporarily shut down. Therefore, a ferromagnetic impurity separation device that can improve the shortcomings of the aforementioned patents is yet to be proposed. Summary of the invention

[0004] Therefore, the present invention provides a ferromagnetic impurity separation device that can improve the shortcomings of the aforementioned patents. The ferromagnetic impurity separation device includes a main shell, a sub-shell, and a plurality of magnetic grid units. The main shell has an inlet, an outlet, and a first accommodating space arranged between the inlet and the outlet to define a material flow path, an action path, and a first length in the direction of the action path. The sub-shell is connected to the main shell, and has a second accommodating space adjacent to the first accommodating space, a second length in the direction of the action path, and the second length is shorter than the first length. Each magnetic grid unit is sequentially stacked on the main and sub-shells, and includes a frame, a plurality of magnetic parts and a scraper assembly. The frame is supported by the main and sub-shells, and can move along the action path between a retracted position, an intermediate position, and a stretched position. Each magnetic member includes a magnetic area, a non-magnetic area and a third length in the direction of the movement path, the third length is shorter than the first length but longer than the second length; each magnetic member is fixed to the frame, and when the frame is located at the retracted position, each magnetic member is accommodated in the first accommodation space of the main shell body for contacting with the material flow, when the frame moves from the retracted position to the intermediate position, each magnetic member will move synchronously with the frame by a first distance approximately equal to the second length, so that a part of it is accommodated in the first accommodation space of the main shell body, and the rest is accommodated in the second accommodation space of the auxiliary shell body, when the frame moves from the retracted position to the stretched position, each magnetic member will move synchronously with the frame by a second distance approximately equal to the third length, so that a part of it is located outside the auxiliary shell body, and the rest including the non-magnetic area is accommodated in the second accommodation space of the auxiliary shell body. The scraper assembly is accommodated in the second accommodating space of the auxiliary shell body, and is coupled to the frame and each magnetic member in a manner that it can slide along the long axis of each magnetic member and the sliding distance is limited within the second length; thereby, when the frame is located at the retracted position, the scraper assembly is located on one side of the second accommodating space of the auxiliary shell body, and when the frame moves from the retracted position to the intermediate position, the scraper assembly will move synchronously with the frame and be located on the other side of the second accommodating space of the auxiliary shell body, so that when the frame continues to move on the action path, the ferromagnetic impurities adsorbed by a part of each magnetic member can be scraped away and accumulated in the remaining part of each magnetic member, and when the frame moves from the intermediate position to the stretched position, the scraper assembly will still be located in the original position, so that when it is moved in a manner opposite to the action path, the ferromagnetic impurities accumulated in the remaining part of each magnetic member can be scraped away to the non-magnetic area of ​​each magnetic member and fall off.

[0005] A feature of the ferromagnetic impurity separation device is that the frame includes a front support plate, a rear support plate, a panel opposite to the front support plate, two guide rods and at least one connecting rod; each guide rod has a fourth length in the direction of the movement path and is longer than the third length, and is coupled between the panel and the rear support plate, and the at least one connecting rod is coupled between the front support plate and the panel.

[0006] Another feature of the ferromagnetic impurity separation device is that each magnetic member is fixedly connected to the frame in parallel with each other and is located between each guide rod. Furthermore, each magnetic member has a non-magnetic rod body, a magnet group and a non-magnetic object, the non-magnetic rod body has a proximal end fixedly connected to the front support plate and a distal end fixedly connected to the rear support plate, the magnet group is accommodated in the proximal end of the non-magnetic rod body and extends at least to the middle section of the non-magnetic rod body to form the magnetic area, and the non-magnetic object is accommodated in the distal end of the non-magnetic rod body and extends to abut against the magnet group to form the non-magnetic area.

[0007] Another feature of the ferromagnetic impurity separation device is that the scraper assembly includes a substrate coupled to each guide rod, the substrate having a window; a first scraper is fixed to one side of the substrate, the first scraper is made of a first material with a predetermined hardness, and has a plurality of first through holes corresponding to the window, for allowing the non-magnetic rod of each magnetic part to pass through the first scraper in a manner in which its outer circumference is in close contact with the inner surface of each first through hole. In addition, the scraper assembly may also include a second scraper fixed to the other side of the substrate, the second scraper is made of a second material with a lower hardness than the first material, and has a plurality of second through holes corresponding to each first through hole, the inner diameter of each second through hole being smaller than the outer diameter of each magnetic part, for allowing the non-magnetic rod of each magnetic part to pass through the second scraper in a manner of mutual interference.

[0008] Another feature of the ferromagnetic impurity separation device is that the main shell may include a first opening for each frame to be pushed into or pulled out of the first accommodation space, two first support plates are arranged on both sides of the first opening, and each guide rod of each frame is supported by the main shell in a manner of penetrating each first support plate and can independently move along the action path. The main shell may also include a baffle plate arranged at the first opening, the baffle plate having a plurality of guide holes for each magnetic member to pass through, when each frame is located at the retracted position, each front support plate is stopped by the baffle plate and is located in the second accommodation space, and when each frame is located at the extended position, each rear support plate is stopped by each baffle plate and is located in the first accommodation space.

[0009] Another feature of the ferromagnetic impurity separation device is that the sub-shell also includes two side plates to define a second accommodating space with a second opening for each frame to be pushed in or pulled out from the first opening, and two second support plates are respectively arranged on both sides of the second opening, and each guide rod of each frame is supported by the sub-shell in a manner of penetrating each second support plate and can independently move along the action path. In addition, the sub-shell can also be provided with a plurality of guide grooves separated from each other and extending along the action path on each side plate, each guide groove has a length extending on the action path to define the first distance, and the scraper assembly further includes two gripping rods, each gripping rod is respectively fixed to both sides of the base plate and passes out from the corresponding guide groove, whereby the operator can grip each gripping rod to move the scraper assembly along each guide groove.

[0010] Another feature of the ferromagnetic impurity separation device is that it further includes at least one locking device, which is arranged on the auxiliary housing and is used to selectively lock each magnetic grid unit at a predetermined position.

[0011] Another feature of the ferromagnetic impurity separation device is that it may also include multiple first and second linear drives, which are respectively arranged on the main shell, each first linear drive is respectively coupled to each frame to control the reciprocating movement of each frame, and each second linear drive is respectively coupled to each scraper assembly to control the movement of each scraper assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below with reference to embodiments and accompanying drawings, wherein:

[0013] Figure 1 A partially exploded perspective view of an embodiment of a ferromagnetic impurity separation device disclosed in the present invention;

[0014] Figure 2 for Figure 1 A perspective view of a magnetic grid unit in the illustrated embodiment;

[0015] Figure 3 for Figure 2 A three-dimensional diagram of a magnetic member of the magnetic grid unit;

[0016] Figure 4 For along Figure 3 A cross-sectional view in the 4-4 direction;

[0017] Figure 5 For along Figure 3 A cross-sectional view along the 5-5 direction;

[0018] Figure 6 for Figure 2 A perspective exploded view of the scraper plate assembly of the magnetic grid unit shown;

[0019] Figure 7 for Figure 1 A three-dimensional view of each magnetic grid unit in the embodiment shown in FIG. 1 when the magnetic grid unit is located in a retracted position;

[0020] Figure 8 for Figure 1 A perspective view of the embodiment shown in which the uppermost magnetic grid unit is in a stretched position;

[0021] Fig. 9 for Figure 1 The top view of the uppermost magnetic grid unit in the illustrated embodiment is located at an intermediate position;

[0022] Fig.10 for Figure 1 The top view of the uppermost magnetic grid unit in the embodiment shown is in the stretched position; Fig.11 and 12 for Figure 1 A schematic top view of the scraper assembly of the uppermost magnetic grid unit in the illustrated embodiment being moved in a direction opposite to the motion path P, and

[0023] Fig.13 It is a three-dimensional diagram of another embodiment of the ferromagnetic impurity separation device of the present invention.

[0024] [Description of Reference Numerals]

[0025] 100-Ferromagnetic impurity separation device

[0026] 10-Main housing

[0027] 102, 104- first side plate

[0028] 106, 108- first support plate

[0029] 110-Baffle

[0030] 112-Guide hole

[0031] 113, 115-first guide hole

[0032] 12-First storage space

[0033] 14-Feeding port

[0034] 16-Discharge port

[0035] 18-First opening

[0036] 30-Auxiliary shell

[0037] 302, 304- Second side plate

[0038] 306, 308- second support plate

[0039] 307-Plate

[0040] 309, 311- Second guide hole

[0041] 310-Guide groove

[0042] 313-Upper hole

[0043] 32- Second storage space

[0044] 34-Collection port

[0045] 36-Second opening

[0046] 361, 362, 363 - Exit

[0047] 38-crossbar

[0048] 39-Locking device

[0049] 50-Collector

[0050] 60-Magnetic grid unit

[0051] 61-Frame

[0052] 62-Front support plate

[0053] 64-Rear support plate

[0054] 66-Panel

[0055] 660-Grip

[0056] 70-Magnetic parts

[0057] 701-Non-magnetic rod

[0058] 702-Near End

[0059] 704-Remote

[0060] 707-Front section

[0061] 708-Back section

[0062] 720-Magnet Group

[0063] 72-Magnetic Zone

[0064] 722-Magnet

[0065] 724-Separator

[0066] 74-Non-magnetic area

[0067] 742-Non-magnetic parts

[0068] 80-Guide rod

[0069] 802-First End

[0070] 804-Second End

[0071] 82-Connecting rod

[0072] 822-Front End

[0073] 824-Backend

[0074] 90-Scraper assembly

[0075] 92-Substrate

[0076] 920-Central Window

[0077] 922-Through hole

[0078] 924-Holding rod

[0079] 94-First Scraper

[0080] 942-First Perforation

[0081] 96-Second scraper

[0082] 962-Second piercing

[0083] 98-Positioning plate

[0084] 982-Third piercing

[0085] 200-Ferromagnetic impurity separation device

[0086] 202, 204-Magnetic grid unit

[0087] 206, 208 - first linear actuator (pneumatic cylinder)

[0088] 210, 212-Panel

[0089] 214, 216 - Second linear actuator (pneumatic cylinder)

[0090] 218, 220-scraper assembly

[0091] L1 - first length

[0092] L2 - Second Length

[0093] L3-third length

[0094] L4-Fourth Length

[0095] L5-Fifth Length

[0096] L6-sixth length

[0097] P-Motion Path

[0098] W1 - first width

[0099] W2 - Second width DETAILED DESCRIPTION

[0100] First see Figure 1 An embodiment of the ferromagnetic impurity separation device disclosed in the present invention is shown in FIG. The ferromagnetic impurity separation device 100 includes a main housing 10, a secondary housing 30 adjacent to the main housing, a collector 50 arranged below the secondary housing 30, and three magnetic grid units 60 arranged in sequence on the main housing 10 and the secondary housing 30 in a stacked manner.

[0101] The main housing 10 includes two first side plates 102, 104, two first support plates 106, 108 and a baffle 110. Each of the first side plates 102, 104 defines a first accommodation space 12, an inlet 14 and an outlet 16 respectively communicating with the accommodation space 12, and a first opening 18 located therebetween.

[0102] The first accommodating space 12 defines a material flow path, an action path P perpendicular to the material flow path, and a first length L1 extending along the action path P. The baffle 110 is disposed on the first opening 18. Each of the first support plates 106, 108 is fixedly disposed on both sides of the baffle 110.

[0103] The auxiliary housing 30 includes two second side plates 302, 304 and two second support plates 306, 308, and an upper plate 307. Each second side plate 302, 304 is combined with the upper plate 307 to define a second accommodating space 32, a collecting port 34 and a second opening 36, and the collector 50 is located below the collecting port 34. The second accommodating space 32 has a second length L2 extending along the action path P. The second accommodating space 32 is adjacent to the first accommodating space 12 in the direction of the action path P. The second length L2 is shorter than the first length L1. The auxiliary housing 30 further includes two cross bars 38 respectively fixed to the second side plates 302, 304 to separate the second opening 36 into three outlets 361, 362 and 363, whereby each magnetic grid unit 60 can be independently pushed in or pulled out from the second opening 36. The upper plate 307 has an upper hole 313 for viewing the second inner space 32 from the outside.

[0104] Each magnetic grid unit 60 is identical in structure except for the number of magnetic components, so only one magnetic grid unit is used for illustration below. Figure 2As shown, it includes a frame 61, six magnetic members 70 and a scraper assembly 90. The frame 61 is supported by the main and auxiliary housings 10, 30, and can move along the action path P between a retracted position, a middle position and a stretched position.

[0105] The frame 61 has a front support plate 62, a rear support plate 64, a panel 66, two guide rods 80, and two connecting rods 82. The front support plate 62 has a first width W1, which is used to define a first area for fixing one end of each magnetic member 70. The rear support plate 64 has a second width W2 longer than the first width W1, which is used to fix the other end of each magnetic member 70 to a second area relative to the first area, and retain two side ends for fixing one end of each guide rod 80 respectively. The front and rear support plates 62, 64 are separated by a predetermined distance. Each magnetic member 70 is fixed to the front support plate 62 at one end and fixed to the rear support 64 at the other end in a manner parallel to each other and spaced apart.

[0106] Each magnetic member 70, such as Figure 2-5 As shown, there is a non-magnetic rod 701, a magnet group 720 and a non-magnetic member 742. The non-magnetic rod 701 has a third length L3 on the action path P, a proximal end 702 is fixed to the front support plate 62, and a distal end 704 is fixed to the rear support plate 64. There are many ways of fixing, such as using bolts to screw. In this embodiment, the cross section of the non-magnetic rod 701 is raindrop-shaped to reduce the accumulation of materials on its top surface. The magnet group 720 includes a plurality of magnets 722 with circular cross sections and a plurality of separators 724 respectively arranged between two adjacent magnets 722. The magnet group 722 is accommodated in the non-magnetic rod 701 and extends from the proximal end 702 to at least a middle section of the non-magnetic rod 701 to form a magnetic area 72. The non-magnetic member 742 is also received in the non-magnetic rod 701 and extends from the distal end 702 to abut against the magnet set 720 to form a non-magnetic region 74. Preferably, the third length L3 of the non-magnetic rod 701 is shorter than the first length L1 but longer than the second length L2.

[0107] Guide rod 80, such as Figure 2As shown, the connecting rod 82 has a fourth length L4 longer than the third length L3 and is coupled between the panel 66 and the rear support plate 64, wherein the first end 802 of a guide rod 80 is coupled to one side of the panel 66, and the second end 804 is coupled to one side of the rear support plate 64. The first end 802 of another guide rod 80 is coupled to the other side of the panel 66, and the second end 804 is coupled to the other side of the rear support plate 64. Each connecting rod 82 has a fifth length L5 that is approximately the same as the second length L3, and is coupled between the panel 66 and the front support plate 62, wherein the front end 822 of each connecting rod 82 is coupled to the panel 66, and the rear end 824 of each connecting rod 82 is coupled to the front support plate 62.

[0108] The scraper assembly 90, such as Figure 6 As shown, it is arranged in the second accommodating space 32, so as to be able to slide along the long axis of each magnetic member 70, and to contact the surface of each magnetic member 70 while sliding. The scraper assembly 90 includes a substrate 92, a first scraper 94, a second scraper 96 and a positioning plate 98. The substrate 92 has a central window 920 and through holes 922 located at both ends thereof, for each guide rod 80 to pass through. The first scraper 94 is made of a first material with a predetermined hardness, such as Mono Cast Nylon, and is fixedly connected to one side of the substrate 92. The first scraper 94 also has a plurality of first through holes 942 located in the area corresponding to the window 920 of the substrate 92, for each magnetic member 70 to pass through, wherein the inner circumference of each first through hole 942 is in close contact with the outer circumference of each magnetic member 70 corresponding thereto. The second scraper 96 is made of a second material with a lower hardness than the first material, such as silicone, and is fixedly connected to the other side of the substrate 92. The second scraper 96 also has a plurality of second through holes 962 located in the area corresponding to the window 920 of the substrate 92, for each magnetic member 70 to pass through. In this embodiment, the inner diameter of each second through hole 962 is smaller than the outer diameter of each non-magnetic rod 701, so that the two can produce interference fit and effectively scrape off the ferromagnetic impurities attached to each non-magnetic rod 701. The positioning plate 98 has a plurality of third through holes 982 corresponding to each second through hole 962, and is fixed to the substrate 92 by sandwiching the second scraper 96 between the positioning plate 98 and the substrate 92, so that each magnetic member 70 can stably pass through each second through hole 962.

[0109] Please see again Figure 1 , Figure 7 and Figure 8Each magnetic grid unit 60 is arranged on the main housing 10 and the auxiliary housing 30 in a stacked and slidable manner. The manner in which each magnetic grid unit 60 is arranged on the main housing 10 and the auxiliary housing 30 is the same. The following description will only be made of the magnetic grid unit 60 on the top layer. In this embodiment, the frame 61 of the magnetic grid unit 60 is supported by the main housing 10 in a manner that each guide rod 80 passes through each first guide hole 113, 115 of each first support plate 106, 108, and each second guide hole 309, 311 of each second support plate 306, 308, and thereby can move along the motion path P. In order to allow each guide rod 80 to slide smoothly in each first and second guide holes, a self-lubricating bearing can be respectively filled in each guide hole. Furthermore, the two side plates 302 and 304 of the auxiliary housing 30 include three mutually spaced guide grooves 310, each of which has a sixth length L6 on the action path P and is equal to the second length L2. The scraper assembly 90 further includes two gripping rods 924, each gripping rod 924 is respectively fixed to the two sides of the base plate 92, and extends outward from each corresponding guide groove 310. Thus, the operator can grip each gripping rod 924 to reciprocate the scraper assembly 90 along each guide groove 310 at a first distance defined by the sixth length L6. In addition, the panel 66 has a pair of grips 660 for the operator to grip when moving the frame 61.

[0110] After the frame 61 is combined with the main housing 10, the rear support plate 64 is accommodated in the first internal space 12, and the baffle 110 is provided with a plurality of guide holes 112, whereby, when the frame 61 is pulled to the stretched position, the rear support plate 64 will be stopped by the baffle 110, so that the frame 61 is limited to the position and each magnetic member 70 is allowed to pass through each guide hole 112 and enter the second accommodation space 32. Furthermore, when the frame 61 is pulled to the stretched position, the scraper assembly 90 will move synchronously and abut against the front end of each guide slot 310 through each holding rod 924. In this state, since the third length L3 of each magnetic member 70 is greater than the second length of the auxiliary housing 30, each magnetic member 70 will have a front section 707 located outside the auxiliary housing 30, and a rear section 708 together with the non-magnetic area 74 located in the second accommodation space 32. Preferably, the front section 707 of each magnetic member 70 is longer than the rear section 708 .

[0111] In this embodiment, Figure 7As shown, the first length L1 of the first accommodating space 12 is longer than the third length L3 of each magnetic member 70, and the front support plate 62 is arranged outside the first accommodating space 12. Therefore, when the frame 61 is pushed into the front support plate 62 and stopped by the baffle 110, the frame 61 will be positioned in the retracted position, and all the magnetic members 70 are accommodated in the first internal space 12 for contacting with the material flow. At this time, the panel 66 is against the outside of each second support plate 306, 308. Furthermore, the ferromagnetic impurity separation device 100 can include two locking devices 39, which are respectively arranged on each side plate 302 and 304 of the auxiliary housing 30 to lock the magnetic grid unit 60 in a locked position relative to the auxiliary housing 30.

[0112] The following will further describe the operation of the ferromagnetic impurity separation device 100 so that its advantages can be more clearly understood. Figure 7 As shown, first, all the frames 61 are arranged in the retracted position, at which time, each magnetic member 70 is accommodated in the first internal space 12, and is used to contact the material flow entering from the feed port 14 and passing through the first internal space 12. Therefore, the ferromagnetic impurities in the material flow will be adsorbed on the surface of the magnetic area 72 of each magnetic member 70, and at the same time, all the frames 61 are locked in this position by each locking device 39. When the ferromagnetic impurities adsorbed on the surface of the magnetic area 72 of each magnetic member 70 of the uppermost magnetic grid unit 60 accumulate to a predetermined amount, the operator can scrape off the ferromagnetic impurities of the uppermost magnetic grid unit 60, and the remaining magnetic grid units 60 continue to stay in the retracted position to adsorb the ferromagnetic impurities in the material flow. When performing the scraping action, the operator first unlocks each locking device 39, and then holds each handle 660 to pull the frame 61 outward along the action path P by a first distance approximately equal to the second length. At this time, the scraping member assembly 90 will synchronously move the first distance, so that each holding rod 924 is against the front end of each guide groove 310, as shown in FIG. Fig. 9 In this state, the frame 61 and the scraper assembly 90 are both located at the middle position. At this time, if the operator continues to pull the frame 61 outward along the action path P for a second distance, the frame 61 will be located at the stretched position, and the ferromagnetic impurities adsorbed on the surface of the front section 707 of each magnetic member 70 will be scraped by the scraper assembly 90 to the rear section 708, as shown in FIG. Fig.10 As shown, the first stage of the scraping action is performed. Next, the operator locks each locking device 39 and holds each holding rod 924 to pull the scraping member assembly 90 in the opposite direction of the action path P, as shown in FIG. Fig.10 and 11As shown, the ferromagnetic impurities adsorbed on the surface of the rear section 708 of the magnetic member 70 are scraped toward the non-magnetic area 74 to be automatically separated, so as to perform the second stage of scraping action. After the second stage of scraping action is completed, the operator can unlock each locking device 39 again, and then push the frame 61 back to the retracted position. As described above, by pulling the frame 61 from the retracted position to the middle position to perform the first stage of scraping action, the stroke of the scraping member assembly 90 for the second stage of scraping action can be shortened. Therefore, compared with the prior art, the present invention can not only save labor, but also save time.

[0113] Please see again Fig.13 The ferromagnetic impurity separation device provided by the present invention can also be operated automatically. For example, in the ferromagnetic impurity separation device 200 of the second embodiment of the present invention, two layers of magnetic grid units 202, 204, two first linear actuators 206, 208, such as pneumatic cylinders, are respectively coupled to the panels 210, 212 of each magnetic grid unit 202, 204, and two second linear actuators 214, 216, which can also be pneumatic cylinders, are respectively coupled to the scraper assembly 218, 220 of each magnetic grid unit 202, 204. During operation, one set of pneumatic cylinders, such as the first pneumatic cylinder 206 and the second pneumatic cylinder 214, synchronously move the magnetic grid unit 202 from a retracted position along the direction of the action path P to a stretched position, and simultaneously perform the first stage of scraping action, and then the second pneumatic cylinder 214 moves the scraper assembly 218 in the opposite direction of the action path P to perform the second stage of scraping action.

Claims

1. A ferromagnetic impurity separation device, comprising: A main housing having an inlet, an outlet, and a first accommodation space arranged between the inlet and the outlet to define a material flow path, an action path, and a first length in the direction of the action path; A secondary housing connected to the main housing and having a second accommodation space adjacent to the first accommodation space; The auxiliary housing has a second length in the direction of the action path, and the second length is shorter than the first length; A plurality of magnetic grid units are sequentially stacked on the main and auxiliary housings, each magnetic grid unit comprising a frame, a plurality of magnetic components and a scraper assembly; The frame is supported by the main and auxiliary shells and can move along the action path between a retracted position, a middle position and a stretched position; Each magnetic member comprises a non-magnetic rod, a magnet group and a non-magnetic object, wherein the magnet group is accommodated in the proximal end of the non-magnetic rod and extends at least to the middle section of the non-magnetic rod to form a magnetic area, and the non-magnetic object is accommodated in the distal end of the non-magnetic rod and extends to abut against the magnet group to form a non-magnetic area; The scraper assembly is received in the second accommodation space of the auxiliary housing, and is coupled to the frame and each magnetic member in a manner that the scraper assembly can slide along the long axis of each magnetic member and the sliding distance is limited within the second length; Features : Each magnetic member has a third length in the direction of the action path, the third length is shorter than the first length but longer than the second length, and is fixed to the frame. When the frame is located at the retracted position, each magnetic member is accommodated in the first accommodation space of the main shell body for contacting with the material flow. When the frame body moves from the retracted position to the intermediate position, each magnetic member will move synchronously with the frame body by a first distance equal to the second length, so that a part of it is accommodated in the first accommodation space of the main shell body, and the rest of it is accommodated in the second accommodation space of the auxiliary shell body. When the frame body moves from the retracted position to the stretched position, each magnetic member will move synchronously with the frame body by a second distance equal to the third length, so that a part of it is located outside the auxiliary shell body, and the rest of it including the non-magnetic area is accommodated in the second accommodation space of the auxiliary shell body. The frame includes a front support plate, a rear support plate, a panel opposite to the front support plate, and two guide rods; each guide rod has a fourth length in the direction of the action path and is longer than the third length, and is coupled between the panel and the rear support plate; A proximal end of the non-magnetic rod of each magnetic member is fixedly connected to the front support plate, and a distal end is fixedly connected to the rear support plate; The main housing includes a first opening for each magnetic grid unit to be pushed into or pulled out of the first accommodation space, two first support plates are respectively arranged on both sides of the first opening, each guide rod of each frame is supported by the main housing in a manner of penetrating each first support plate and can independently move along the action path, a baffle is arranged at the first opening, the baffle has a plurality of guide holes for each magnetic member to pass through, when each frame is located at the retracted position, each front support plate is stopped by the baffle and is located in the second accommodation space, and when each frame is located at the extended position, each rear support plate is stopped by each baffle and is located in the first accommodation space; The secondary housing includes two side plates, which are used to define a second accommodation space having a second opening, so that each magnetic grid unit can be pushed in or pulled out from the first opening; each side plate is provided with a plurality of guide grooves which are separated from each other and extend along the action path, and each guide groove has a length extending along the action path, so as to define the first distance; as well as The scraper assembly includes a base plate coupled to each guide rod, the base plate having a window, a first scraper fixed to one side of the base plate, the first scraper made of a first material having a predetermined hardness, and having a plurality of first through holes corresponding to the window, for allowing the non-magnetic rod body of each magnetic member to pass through the first scraper in a manner that its outer circumference is in close contact with the inner surface of each first through hole, and two holding rods, each holding rod being fixed to two sides of the base plate and passing out from each corresponding guide groove, whereby the operator can hold each holding rod to move the scraper assembly along each guide groove; Whereby, when the frame is located at the retracted position, the scraper assembly is located on one side of the second accommodating space of the sub-shell body; when the frame moves from the retracted position to the middle position, the scraper assembly will move synchronously with the frame and be located on the other side of the second accommodating space of the sub-shell body, so that when the frame continues to move on the action path, the ferromagnetic impurities adsorbed by a part of each magnetic component can be scraped off and accumulated in the remaining part of each magnetic component; when the frame moves from the middle position to the stretched position, the scraper assembly will still be located in the original position, so that when it is moved in a manner opposite to the action path, the ferromagnetic impurities accumulated in the remaining part of each magnetic component can be scraped off to the non-magnetic area of ​​each magnetic component and fall off.

2. The ferromagnetic impurity separation device according to claim 1, characterized in that: The frame further includes at least one connecting rod, which has a fifth length equal to the second length and is coupled between the front supporting plate and the panel.

3. The ferromagnetic impurity separation device according to claim 1, characterized in that: The cross section of the non-magnetic rod is raindrop-shaped.

4. The ferromagnetic impurity separation device according to claim 1, characterized in that: The scraper assembly also includes a second scraper fixed to the other side of the substrate. The second scraper is made of a second material with a hardness lower than that of the first material and has a plurality of second through holes corresponding to each first through hole. The inner diameter of each second through hole is smaller than the outer diameter of each magnetic component so that the non-magnetic rod of each magnetic component can pass through the second scraper in a mutual interference manner.

5. The ferromagnetic impurity separation device according to claim 4, characterized in that: The scraper assembly further includes a positioning plate, on which a plurality of third through holes are respectively opposite to each second through hole. The positioning plate is fixed to one side of the base plate and the second scraper is clamped between the positioning plate and the base plate.

6. The ferromagnetic impurity separation device according to claim 1, characterized in that: The auxiliary housing further comprises two second support plates respectively arranged at two sides of the second opening. Each guide rod of each frame is supported by the auxiliary housing in a manner of penetrating each second support plate and can independently move along the action path.

7. The ferromagnetic impurity separation device according to claim 1, characterized in that: It further comprises at least one locking device, which is arranged on the auxiliary housing and is used for selectively locking each magnetic grid unit at a predetermined position.

8. The ferromagnetic impurity separation device according to claim 1, characterized in that: It further includes a plurality of first and second linear drivers, which are respectively arranged on the main shell, each first linear driver is respectively coupled to each frame to control the reciprocating movement of each frame, and each second linear driver is respectively coupled to each scraper assembly to control the movement of each scraper assembly.

Images