阅读说明：本技术 一种螺旋给料机 (Screw feeder ) 是由 唐志强 杨航 于 2020-06-09 设计创作，主要内容包括：本发明公开了一种螺旋给料机,该螺旋给料机包括：筒体,筒体内设有送料螺旋,送料螺旋的端部与筒体绝缘连接,筒体的内壁设有绝缘层；第一报警装置,第一报警装置通过第一导线与送料螺旋电性连接,第一报警装置还通过第二导线与筒体电性连接。该螺旋给料机能够自动判断送料螺旋与筒体之间是否发生刮壁,并在发生刮壁后发出报警通知操作人员进行处理,避免由于送料螺旋与筒体发生摩擦而导致锂电物料中磁性异物超标的情况,节省磁性异物超标原因的排查时间。(The invention discloses a screw feeder, which comprises: the feeding device comprises a barrel, wherein a feeding screw is arranged in the barrel, the end part of the feeding screw is in insulated connection with the barrel, and an insulating layer is arranged on the inner wall of the barrel; the first alarm device is electrically connected with the feeding screw through a first lead and is also electrically connected with the barrel through a second lead. The screw feeder can automatically judge whether the wall scraping occurs between the feeding screw and the barrel, and sends an alarm to inform an operator to process the wall scraping, so that the situation that the magnetic foreign matters in the lithium battery materials exceed the standard due to the friction between the feeding screw and the barrel is avoided, and the investigation time of the reason that the magnetic foreign matters exceed the standard is saved.)

1. A screw feeder, characterized by comprising:

the feeding device comprises a barrel (10), wherein a feeding screw (11) is arranged in the barrel (10), the end part of the feeding screw (11) is in insulation connection with the barrel (10), and an insulation layer is arranged on the inner wall of the barrel (10);

the feeding device comprises a first alarm device (20), wherein the first alarm device (20) is electrically connected with the feeding screw (11) through a first lead (30), and the first alarm device (20) is also electrically connected with the barrel (10) through a second lead (40).

2. A screw feeder according to claim 1, further comprising a second warning device (50), the second warning device (50) being electrically connected to the feed screw (11) via the first wire (30), the second warning device (50) being further connected to the inner cavity of the barrel (10) via a third wire (60), the surface of the feed screw (11) being provided with a non-conductive wear-resistant coating.

3. A screw feeder according to claim 2, further comprising a third warning device (70), the third warning device (70) being electrically connected to the barrel (10) via the second wire (40), the third warning device (70) being further connected to the inner cavity of the barrel (10) via the third wire (60).

4. A screw feeder according to claim 2, characterized in that the cylinder (10) is provided with a through hole, an insulating block (80) is embedded in the through hole, a connecting bolt (90) is arranged on the insulating block (80) in a penetrating manner, the end of the connecting bolt (90) is connected with the inner cavity of the cylinder (10), and the third wire (60) is connected to the connecting bolt (90).

5. A screw feeder according to claim 1, further comprising a third warning device (70), the third warning device (70) being electrically connected to the barrel (10) via the second wire (40), the third warning device (70) being further connected to the inner cavity of the barrel (10) via a third wire (60).

6. A screw feeder according to claim 1, further comprising a third wire (60) and a PLC controller (100), wherein the first wire (30), the second wire (40) and the third wire (60) are all electrically connected to the PLC controller (100), the PLC controller (100) is electrically connected to the first alarm device (20), and the other end of the third wire (60) is connected to the inner cavity of the cylinder (10).

7. A screw feeder according to any one of claims 1-6, characterized in that a bearing support (110) is mounted at an end of the cylinder (10), a bearing (120) is mounted on the bearing support (110), an end of the feed screw (11) is rotatably mounted on the bearing (120), the cylinder (10) is in insulated connection with the bearing support (110), and the first wire (30) is connected to the bearing (120) and connected to the feed screw (11) through the bearing (120).

8. A screw feeder according to claim 7, characterized in that the end of the cylinder (10) is provided with a first flange (12), the bearing support (110) is provided with a second flange (111), the cylinder (10) and the bearing support (110) are connected through bolts (130) arranged on the first flange (12) and the second flange (111) in a penetrating manner, a first insulating pad (140) is arranged between the first flange (12) and the second flange (111), and an insulating sleeve is sleeved outside the bolts (130).

9. A screw feeder according to claim 8, characterized in that bolt hole walls on the first flange (12) and the second flange (111) are provided with insulating coatings, nuts (131) are sleeved on the bolts (130), and a second insulating pad (150) is arranged between the nuts (131) and the second flange (111).

10. A screw feeder according to claim 7, characterized in that a sealing device (160) is arranged in the bearing support (110), the sealing device (160) is sleeved on the end part of the feeding screw (11), the end surface of the sealing device (160) is contacted with the cylinder body (10), and the end surface of the sealing device (160) contacted with the cylinder body (10) is provided with an insulating coating.

Technical Field

The invention relates to the technical field of screw feeding devices, in particular to a screw feeder with a wall scraping alarm function, which is suitable for conveying lithium battery materials.

Background

At present, a large amount of materials are conveyed by a screw feeder in the production process of the lithium battery industry; because the lithium battery material has extremely high control requirement on the magnetic foreign matters and often meets the ppb level (billionth), the screw feeder used in the lithium battery industry carries out internal spraying treatment (both the surface of the screw and the inner wall of the cylinder carry out spraying) so as to prevent the materials from directly contacting with metals.

However, during the use of the screw feeder, due to long-term use (fatigue deformation) or external force action, the screw and the cylinder wall in the screw feeder risk to scrape the wall; when the wall is scraped to spiral and barrel, often can not in time discover in the production process, unless spiral and section of thick bamboo wall scrape the sound of wall output abnormal sound very big, operating personnel just can go to inspect, and the material of producing many batches before this moment causes the magnetism foreign matter to rise in the middle of entering into lithium electricity material because the foreign matter that spiral and section of thick bamboo wall friction produced, leads to the index of producing the material unqualified, need carry out the processing of doing over again, extravagant a large amount of manpower and financial resources.

The other condition is that when the abnormal sound of the wall scraping between the spiral and the cylinder wall is not great, an operator does not find the abnormal sound, but the magnetic foreign matter of the produced material is ultrahigh, the material is reworked, a production line is required to find the source of the foreign matter introduction, and more time and manpower are required to be consumed to find the reason.

In addition, after the screw feeder is used for a long time, the inner wall of the screw or the cylinder body of the screw feeder is normally worn, and if the inner wall of the screw or the cylinder body is normally worn, the magnetic foreign matters in the conveyed materials can be increased. The existing screw feeder can not detect whether the inner wall of the screw or the cylinder is normally worn or not in time.

Disclosure of Invention

The invention mainly aims to provide a screw feeder, which at least solves the problem that whether a screw and a cylinder wall scrape a wall cannot be automatically judged in the prior art.

In order to achieve the above object, the present invention provides a screw feeder comprising:

the feeding device comprises a barrel, wherein a feeding screw is arranged in the barrel, the end part of the feeding screw is in insulated connection with the barrel, and an insulating layer is arranged on the inner wall of the barrel;

the first alarm device is electrically connected with the feeding screw through a first lead and is also electrically connected with the barrel through a second lead.

Further, the feeding device comprises a second alarm device, the second alarm device is electrically connected with the feeding spiral through a first lead, the second alarm device is further connected with the inner cavity of the cylinder through a third lead, and a non-conductive wear-resistant coating is arranged on the surface of the feeding spiral.

Further, still include a third alarm device, third alarm device passes through second wire and barrel electric connection, and third alarm device still is connected with the inner chamber of barrel through the third wire.

Furthermore, a through hole is formed in the barrel, an insulating block is embedded in the through hole, a connecting bolt penetrates through the insulating block, the end portion of the connecting bolt is connected with the inner cavity of the barrel, and a third wire is connected to the connecting bolt.

Further, still include a third alarm device, third alarm device passes through second wire and barrel electric connection, and third alarm device still is connected with the inner chamber of barrel through a third wire.

Further, still include a third wire and a PLC controller, first wire, second wire and third wire all with PLC controller electric connection, PLC controller and first alarm device electric connection, the other end of third wire is connected with the inner chamber of barrel.

Furthermore, a bearing support is installed at the end part of the cylinder body, a bearing is installed on the bearing support, the end part of the feeding spiral is rotatably installed on the bearing, the cylinder body is in insulated connection with the bearing support, and the first lead is connected to the bearing and is connected with the feeding spiral through the bearing.

Furthermore, the end of the barrel is provided with a first flange, the bearing support is provided with a second flange, the barrel is connected with the bearing support through bolts penetrating through the first flange and the second flange, a first insulating pad is arranged between the first flange and the second flange, and an insulating sleeve is sleeved outside the bolts.

Further, the hole walls of the bolt holes in the first flange and the second flange are provided with insulating coatings, the bolts are sleeved with nuts, and second insulating pads are arranged between the nuts and the second flange.

Furthermore, a sealing device is arranged in the bearing support, the sealing device is sleeved at the end part of the feeding spiral, the end face of the sealing device is in contact with the cylinder body, and the end face of the sealing device in contact with the cylinder body is provided with an insulating coating.

By applying the technical scheme of the invention, the first alarm device is respectively and electrically connected with the feeding screw and the cylinder body through the first lead and the second lead; when the feeding screw and the inner wall of the cylinder body scrape the wall, a coating on the surface of the feeding screw and an insulating layer on the inner wall of the cylinder body can be scraped, the feeding screw made of metal is in contact with the cylinder body, at the moment, the first alarm device, the first lead, the feeding screw, the cylinder body and the second lead form a closed loop, the first alarm device is electrified to give an alarm, and an operator is reminded that the feeding screw and the cylinder body have scraped the wall and need to be treated. The screw feeder can automatically judge whether the wall scraping occurs between the feeding screw and the barrel, and sends an alarm to inform an operator to process the wall scraping, so that the situation that the magnetic foreign matters in the lithium battery materials exceed the standard due to the friction between the feeding screw and the barrel is avoided, and the investigation time of the reason that the magnetic foreign matters exceed the standard is saved.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of a screw feeder according to embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of a screw feeder according to embodiment 2 of the present invention.

Fig. 3 is a schematic structural view of a screw feeder according to embodiment 3 of the present invention.

Fig. 4 is a partially enlarged view of a portion a in fig. 3.

Fig. 5 is a partially enlarged view of fig. 3 at B.

Fig. 6 is a schematic structural view of a screw feeder according to embodiment 4 of the present invention.

Fig. 7 is a schematic structural view of a screw feeder according to embodiment 5 of the present invention.

Wherein the figures include the following reference numerals:

10. a barrel; 11. feeding a screw; 12. a first flange; 13. a feed inlet; 14. a discharge port; 15. a viewing port; 20. a first alarm device; 30. a first conductive line; 40. a second conductive line; 50. a second alarm device; 60. a third conductive line; 70. a third alarm device; 80. an insulating block; 90. a connecting bolt; 100. a PLC controller; 110. a bearing support; 111. a second flange; 120. a bearing; 130. a bolt; 131. a nut; 140. a first insulating pad; 150. a second insulating pad; 160. and (7) sealing the device.

Detailed Description

In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The use of "first," "second," and similar terms in the description and in the claims of the present application do not denote any order, quantity, or importance, but rather the intention is to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Example 1:

referring to fig. 1, a screw feeder according to an embodiment of the present invention mainly includes a cylinder 10 and a first alarm device 20, wherein a feed inlet 13 is provided on an upper side of one end of the cylinder 10, a discharge outlet 14 is provided on a lower side of the other end of the cylinder 10, and an observation port 15 is provided on an upper side of one end of the cylinder 10 close to the discharge outlet 14; a feeding screw 11 is rotatably installed in the cylinder 10, two end parts of the feeding screw 11 are in insulation connection with the cylinder 10, an insulation layer is arranged on the inner wall of the cylinder 10, and a wear-resistant coating is sprayed on the surface of the feeding screw 11; one terminal of the first alarm device 20 is electrically connected to the feeding screw 11 through a first wire 30, and the other terminal of the first alarm device 20 is electrically connected to the barrel 10 through a second wire 40. Specifically, the insulating layer on the inner wall of the cylinder 10 may be a non-metallic insulating layer such as a sprayed ETFE, PTFE coating, or a bonded PP plate; and the wear resistant coating on the surface of the feed screw 11 may be a tungsten carbide coating or an alumina coating.

In the screw feeder, two terminals of the first alarm device 20 are respectively and electrically connected with the feeding screw 11 and the cylinder 10 through the first lead 30 and the second lead 40; when the feeding screw 11 and the cylinder 10 are not scraped, because a gap is formed between the feeding screw 11 and the cylinder 10 and an insulating layer is arranged on the inner wall of the cylinder 10, the first alarm device 20, the first lead 30, the feeding screw 11, the cylinder 10 and the second lead 40 cannot form a closed loop, and the first alarm device 20 does not give an alarm; when the feeding screw 11 and the inner wall of the cylinder 10 scrape the wall, the coating on the surface of the feeding screw 11 and the insulating layer on the inner wall of the cylinder 10 are scraped, the feeding screw 11 made of metal is in contact with the cylinder 10, at this time, the first alarm device 20, the first lead 30, the feeding screw 11, the cylinder 10 and the second lead 40 form a closed loop (a power supply is also arranged in the closed loop and is not shown in the figure), the first alarm device 20 is powered on to give an alarm to remind an operator that the feeding screw 11 and the cylinder 10 have scraped the wall and need to be treated. The screw feeder can automatically judge whether wall scraping occurs between the feeding screw 11 and the barrel 10 or not, and send an alarm to inform an operator to process the wall scraping, so that the situation that magnetic foreign matters in lithium battery materials exceed standards due to friction between the feeding screw 11 and the barrel 10 is avoided, and the investigation time of the reason that the magnetic foreign matters exceed standards is saved.

Specifically, in the present embodiment, a bearing support 110 is installed at an end of the cylinder 10, a bearing 120 is installed on the bearing support 110, an end of the feed screw 11 is rotatably installed on the bearing 120, and the cylinder 10 is connected to the bearing support 110 in an insulating manner; the first wire 30 is connected to the bearing 120 and electrically connected to the feed screw 11 through the bearing 120. The cylinder 10 is connected with the bearing support 110 in an insulating way, the feeding screw 11 is arranged on the bearing 120, the bearing 120 is arranged on the bearing support 110, and the first lead 30 is electrically connected with the bearing 120; the first lead 30, the bearing 120, the bearing support 110, the cylinder 10, the second lead 40 and the first alarm device 20 can be prevented from forming a closed loop; the first alarm device 20, the first lead 30, the bearing 120, the bearing support 110, the feeding screw 11, the cylinder 10 and the second lead 40 can form a closed loop only after the insulating layer is scraped by the scraping wall between the feeding screw 11 and the cylinder 10, so that the accuracy and reliability of the alarm sent by the first alarm device 20 are ensured.

Further, in the present embodiment, a first flange 12 is provided at an end of the cylinder 10, a second flange 111 is provided on the bearing support 110, and the cylinder 10 and the bearing support 110 are connected by bolts 130 penetrating through the first flange 12 and the second flange 111. A first insulating gasket 140 is provided between the first flange 12 and the second flange 111, and an insulating sleeve is fitted over the bolt 130. With this arrangement, the first insulating gasket 140 is disposed between the first flange 12 and the second flange 111, and the insulating sleeve is sleeved outside the bolt 130, so that the insulating connection between the cylinder 10 and the bearing support 110 can be effectively performed. Specifically, the first insulating pad 140 is a non-metal non-conductive pad, and the insulating sleeve outside the bolt 130 may be a heat-shrinkable tube.

In order to further improve the insulation between the cylinder 10 and the bearing support 110, in this embodiment, the bolt holes on the first flange 12 and the second flange 111 are subjected to insulation treatment, and the hole walls thereof are provided with insulating coatings (such as spraying non-metal non-conductive coatings); the nut 131 is sleeved on the bolt 130, and a second insulating pad 150 is further disposed between the nut 131 and the second flange 111, and the second insulating pad 150 may also be a non-metal non-conductive gasket. With such an arrangement, insulation between the cylinder 10 and the bearing holder 110 can be better ensured.

In this embodiment, a sealing device 160 is further disposed in the bearing support 110, the sealing device 160 is sleeved on the end of the feeding screw 11, and an end surface of the sealing device 160 contacts with the cylinder 10; the end face of the sealing device 160 contacting the cylinder 10 is insulated and provided with an insulating coating, specifically, a non-metal non-conductive coating can be sprayed or a non-metal non-conductive sleeve can be sleeved on the end face. This arrangement ensures insulation between the sealing device 160 and the cylindrical body 10. The sealing device 160 may be an existing air sealing device or a mechanical sealing device.

Example 2:

referring to fig. 2, a screw feeder according to an embodiment of the present invention has the same main structure as that of embodiment 1, and the screw feeder of this embodiment is mainly different from embodiment 1 in that, on the basis of the structure of embodiment 1, the screw feeder further includes a second alarm device 50, one terminal of the second alarm device 50 is electrically connected to the feeding screw 11 through a first conducting wire 30, and the other terminal of the second alarm device 50 is connected to the inner cavity of the cylinder 10 through a third conducting wire 60; in addition, unlike embodiment 1, the wear-resistant coating on the surface of the feed screw 11 in this embodiment is a non-conductive wear-resistant coating such as alumina.

The screw feeder has the functions of automatically judging whether the feeding screw 11 and the cylinder 10 scrape the wall or not and giving an alarm when the wall scraping occurs; and the feeding device can also automatically judge whether the feeding screw 11 is normally worn or not when the conveyed material is wet material, and send out an alarm by the second alarm device 50 when the feeding screw 11 is normally worn. In addition, the screw feeder can conveniently distinguish whether the wall scraping is generated between the feeding screw 11 and the cylinder body 10 or the feeding screw 11 is normally worn; when the wall scraping occurs between the feeding screw 11 and the cylinder 10, the first alarm device 20 gives an alarm; the second warning device 50 gives a warning when the feed screw 11 is worn normally.

The working principle of automatically judging whether the feeding screw 11 is normally worn is as follows: when the feeding spiral 11 is not abraded, the non-conductive coating on the surface of the feeding spiral 11 is complete, a closed loop cannot be formed among the second alarm device 50, the first lead 30, the feeding spiral 11, the wet material and the third lead 60, and the second alarm device 50 does not give an alarm at this time; when the feeding screw 11 is worn, the non-conductive coating on the surface of the feeding screw 11 partially falls off, a closed loop (a power supply is also arranged in the loop and is not shown in the figure) is formed among the second alarm device 50, the first lead 30, the feeding screw 11, the wet material and the third lead 60, and the second alarm device 50 is electrified to give an alarm to remind an operator to process.

Specifically, in this embodiment, a through hole is formed in the cylinder 10, an insulating block 80 is embedded in the through hole, a connecting bolt 90 is inserted into the insulating block 80, an end of the connecting bolt 90 is connected to the inner cavity of the cylinder 10, and the third wire 60 is connected to the connecting bolt 90. So set up, can be connected third wire 60 with the inner chamber of barrel 10, make third wire 60 can contact with wet material, simultaneously, can avoid third wire 60 and barrel 10 direct contact.

Example 3:

referring to fig. 3, 4 and 5, a screw feeder according to an embodiment of the present invention has the same main structure as that of embodiment 2, and the main difference between the screw feeder of this embodiment and embodiment 2 is that, on the basis of the structure of embodiment 2, the screw feeder of this embodiment further includes a third alarm device 70, one terminal of the third alarm device 70 is electrically connected to the cylinder 10 through the second wire 40, and the other terminal of the third alarm device 70 is connected to the inner cavity of the cylinder 10 through the third wire 60.

On one hand, the screw feeder can automatically judge whether the feeding screw 11 and the cylinder 10 scrape the wall or not, and send out an alarm when the wall scraping occurs; whether the feeding screw 11 is normally worn or not can be automatically judged when the conveyed material is wet material, and an alarm is given by the second alarm device 50 when the feeding screw 11 is normally worn; besides, whether the insulating layer on the inner wall of the cylinder 10 is normally worn or not can be automatically judged when the conveyed material is wet material, and an alarm is given by the third alarm device 70 when the insulating layer on the inner wall of the cylinder 10 is normally worn. In addition, the screw feeder can conveniently distinguish whether wall scraping occurs between the feeding screw 11 and the cylinder 10, whether the feeding screw 11 is normally worn, or whether an insulating layer on the inner wall of the cylinder 10 is normally worn; when the wall scraping occurs between the feeding screw 11 and the cylinder 10, the first alarm device 20 gives an alarm; the second alarm device 50 gives an alarm when the feeding screw 11 is normally worn; the third alarm device 70 gives an alarm when the insulation layer on the inner wall of the cylinder 10 is normally worn.

The working principle of automatically judging whether the insulating layer on the inner wall of the cylinder 10 is normally worn is as follows: when the insulating layer on the inner wall of the cylinder 10 is not abraded, the insulating layer on the inner wall of the cylinder 10 is complete, a closed loop cannot be formed among the third alarm device 70, the second lead 40, the cylinder 10, the wet material and the third lead 60, and the third alarm device 70 does not give an alarm at this time; when the insulating layer on the inner wall of the cylinder 10 is worn, the insulating layer on the inner wall of the cylinder 10 partially falls off, a closed loop (a power supply is also arranged in the loop and is not shown in the figure) is formed among the third alarm device 70, the second lead 40, the cylinder 10, the wet material and the third lead 60, and the third alarm device 70 is powered on to give an alarm to remind an operator to process.

Example 4:

referring to fig. 6, a screw feeder according to an embodiment of the present invention has the same main structure as that of embodiment 1, and the screw feeder of this embodiment is mainly different from embodiment 1 in that, on the basis of the structure of embodiment 1, the screw feeder further includes a third alarm device 70, one terminal of the third alarm device 70 is electrically connected to the cylinder 10 through the second wire 40, and the other terminal of the third alarm device 70 is connected to the inner cavity of the cylinder 10 through the third wire 60. In addition, unlike embodiment 1, the wear-resistant coating on the surface of the feed screw 11 in this embodiment is a non-conductive wear-resistant coating such as alumina.

The screw feeder has the functions of automatically judging whether the feeding screw 11 and the cylinder 10 scrape the wall or not and giving an alarm when the wall scraping occurs; and whether the insulating layer on the inner wall of the cylinder 10 is normally worn or not can be automatically judged when the conveyed material is wet material, and an alarm is given by the third alarm device 70 when the insulating layer on the inner wall of the cylinder 10 is normally worn. In addition, the screw feeder can conveniently distinguish whether wall scraping occurs between the feeding screw 11 and the cylinder 10 or normal abrasion occurs on an insulating layer of the inner wall of the cylinder 10; the first alarm device 20 gives an alarm when wall scraping occurs between the feeding screw 11 and the cylinder 10, and the third alarm device 70 gives an alarm when the insulating layer on the inner wall of the cylinder 10 is normally worn.

The working principle of automatically judging whether the insulating layer on the inner wall of the cylinder 10 is normally worn is as follows: when the insulating layer on the inner wall of the cylinder 10 is not abraded, the insulating layer on the inner wall of the cylinder 10 is complete, a closed loop cannot be formed among the third alarm device 70, the second lead 40, the cylinder 10, the wet material and the third lead 60, and the third alarm device 70 does not give an alarm at this time; when the insulating layer on the inner wall of the cylinder 10 is worn, the insulating layer on the inner wall of the cylinder 10 partially falls off, a closed loop (a power supply is also arranged in the loop and is not shown in the figure) is formed among the third alarm device 70, the second lead 40, the cylinder 10, the wet material and the third lead 60, and the third alarm device 70 is powered on to give an alarm to remind an operator to process.

Specifically, in this embodiment, a through hole is formed in the cylinder 10, an insulating block 80 is embedded in the through hole, a connecting bolt 90 is inserted into the insulating block 80, an end of the connecting bolt 90 is connected to the inner cavity of the cylinder 10, and the third wire 60 is connected to the connecting bolt 90. So set up, can be connected third wire 60 with the inner chamber of barrel 10, make third wire 60 can contact with wet material, simultaneously, can avoid third wire 60 and barrel 10 direct contact.

Example 5:

referring to fig. 7, a screw feeder according to an embodiment of the present invention has the same main structure as that of embodiment 1, and mainly differs from embodiment 1 in that the screw feeder further includes a third wire 60 and a PLC controller 100, the first wire 30, the second wire 40, and the third wire 60 are all electrically connected to the PLC controller 100, the PLC controller 100 is electrically connected to the first alarm device 20, and the other end of the third wire 60 is connected to an inner cavity of the cylinder 10.

In the screw feeder, the first lead 30, the second lead 40 and the third lead 60 are electrically connected with the PLC controller 100, and the PLC controller 100 is electrically connected with the first alarm device 20; whenever any two of the first wire 30, the second wire 40 and the third wire 60 are connected, the PLC controller 100 controls the first alarm device 20 to give an alarm. The screw feeder can automatically judge whether the feeding screw 11 and the cylinder 10 scrape the wall or not and send out an alarm when the wall scraping occurs; whether the feeding screw 11 is normally worn or not can be automatically judged when the conveyed material is wet material, and an alarm is given by the second alarm device 50 when the feeding screw 11 is normally worn; and whether the insulating layer on the inner wall of the cylinder 10 is normally worn or not can be automatically judged when the conveyed material is wet material, and an alarm is given by the third alarm device 70 when the insulating layer on the inner wall of the cylinder 10 is normally worn.

Specifically, a through hole is formed in the cylinder 10, an insulating block 80 is embedded in the through hole, a connecting bolt 90 penetrates through the insulating block 80, the end of the connecting bolt 90 is connected with the inner cavity of the cylinder 10, and the third wire 60 is connected to the connecting bolt 90. So set up, can be connected third wire 60 with the inner chamber of barrel 10, make third wire 60 can contact with wet material, simultaneously, can avoid third wire 60 and barrel 10 direct contact.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.