Heating strip, door frame structure, vehicle door assembly and passenger rail vehicle

Abstract

The utility model provides a heating strip, doorframe structure, car door assembly and passenger transport railcar, the heating strip includes shell and heating wire, the shell is straight strip shape, its cross section is "L" shape, the heating wire coil is provided in the shell, and its both ends are led out of the shell through one end of the shell, and the heating wire coil is provided with the other end of the shell. The whole heating strip is in an angle steel shape, the heating wire is wrapped by the shell, the structural strength of the heating strip is high, the heating wire is arranged in the shell in a coiled mode, heat is evenly distributed during heating of the whole heating strip, and the heating strip is high in heating speed and good in heating effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transportation, and in particular relates to a heating strip, a door frame structure, a vehicle door assembly and a passenger rail vehicle. Background Art

[0002] At present, when rail transit door systems deal with high altitudes and severe cold weather, due to the temperature difference between the inside and outside of the train, a large amount of condensed water is generated on the doors and door frames. Due to the effect of gravity, the condensed water gathers at the bottom of the train door and eventually freezes (making the door difficult to open). Therefore, the doors of high-speed trains need to be equipped with heating functions. At this stage, the doors of high-speed trains are still heated by warm air blowing, which has a slow heating speed and unobvious heating effect. The electric heating tape heating method commonly used in high-speed trains is not suitable for this type of door system with a small area and high winding difficulty. Therefore, it is urgent to carry out heating transformation on the existing door system. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a heating strip with a simple structure and a shape similar to that of an angle steel.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a heating strip, comprising a shell and a heating wire, the shell is a straight bar and its cross-section is "L" shaped, the heating wire coil is arranged in the shell, and its two ends are led out of the shell through one end of the shell.

[0005] The beneficial effect of the above technical solution is that the entire heating strip is in the shape of an angle steel, and the heating wire is wrapped by the shell, which makes its structural strength high, and the heating wire is coiled in the shell, so that the heat distribution of the entire heating strip is uniform during heating, and the heating speed is fast and the effect is good.

[0006] The shell body described in the above technical scheme includes a base shell and a shell cover, the base shell and the shell cover are both straight strip-shaped and their cross-sections are both "L"-shaped, the inner walls on both sides of the base shell inside the inflection are recessed with first wire accommodating grooves distributed in a serpentine shape, and the two ends of the first wire accommodating groove are connected with one end of the base shell, the heating wire is accommodated in the first wire accommodating groove, the shell cover is placed in the inflection of the base shell, and the directions of the inflections of the two are consistent, and the two sides outside the inflection of the shell cover are attached to and connected to the two sides inside the inflection of the shell body.

[0007] The beneficial effect of the above technical solution is that the entire device is assembled from the base shell and the shell cover, and is easy to disassemble, assemble and maintain.

[0008] In the above technical solution, both sides inside the inflection of the base shell are recessed with rivet grooves, and both sides outside the inflection of the shell cover are convexly provided with rivet teeth that cooperate with the rivet grooves. The two sides inside the inflection of the base shell and the two sides outside the inflection of the shell cover are fitted with each other, and the rivet teeth are inserted into the rivet grooves on the corresponding sides to rivet each other.

[0009] The beneficial effect of the above technical solution is that the base shell and the shell cover are plugged into each other through the riveting grooves and the riveting teeth to achieve a detachable connection, which makes the disassembly and assembly of the two more convenient.

[0010] The shell in the above technical solution also includes an end cover, which is "L"-shaped, and one end of the end cover is recessed with an "L"-shaped plug-in groove, and the other end of the end cover is provided with a wire outlet hole that is mutually connected with the plug-in groove. The base shell and the shell cover have one end through which the heating wire passes, which is plugged into the plug-in groove, and both ends of the heating wire pass through the wire outlet hole to the outside of the end cover.

[0011] The beneficial effect of the above technical solution is that the end cover blocks the end of the base shell and the shell cover through which the heating wire passes, which makes the base shell and the shell cover look good.

[0012] The above technical solution also includes a temperature sensor. A first accommodating groove and a second wire accommodating groove are provided on any side of the inflection of the base shell. One end of the second wire accommodating groove is connected to the first accommodating groove, and the other end of the second wire accommodating groove passes through an end of the base shell close to the end cover. The temperature sensor is embedded in the first accommodating groove, and the lead wire of the temperature sensor is led out to the outside of the shell through the second wire accommodating groove and the wire outlet hole.

[0013] The beneficial effect of the above technical solution is that by embedding the temperature sensor in the shell, the real-time temperature of the heating strip can be conveniently known to control the heating power of the heating line.

[0014] The above technical solution also includes a grounding wire, one end of which is connected to a metal block, and a second accommodating groove and a third wire accommodating groove are provided on any side of the inflection of the base shell, one end of the third wire accommodating groove is connected to the second accommodating groove, and the other end of the third wire accommodating groove passes through an end of the base shell close to the end cover, the metal block is embedded in the second accommodating groove, the grounding wire is located in the third wire accommodating groove, and the other end of the grounding wire passes through the wire outlet hole to the outside of the shell.

[0015] The beneficial effect of the above technical solution is that by arranging a metal block on the grounding wire, the connection between the grounding wire and the shell is made more secure.

[0016] The second purpose of the utility model is to provide a door frame structure with a simple structure, an auxiliary heating function at the lower end of the door frame, and a good heating effect.

[0017] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a door frame structure, including a foot pedal, a door frame body and the heating strip as described above, the foot pedal is connected to the lower end of the door frame body by a plurality of bolt fasteners spaced along its length, and one side of the heating strip is clamped at the connection between the foot pedal and the door frame body.

[0018] The beneficial effect of the above technical solution is that the joint between the door frame body and the foot pedal can be heated by the heating strip, and the heating strip is easy to install and has high structural strength.

[0019] In the above technical solution, one side of the heating strip is provided with a plurality of penetrating connection holes spaced apart along its length direction, and the plurality of connection holes correspond one-to-one to the plurality of bolt connectors, and the bolt connectors pass through the corresponding connection holes and connect the foot pedal to the door frame body.

[0020] The beneficial effect of the above technical solution is that it makes the installation of the heating strip between the door frame body and the foot pedal more convenient.

[0021] A third object of the utility model is to provide a vehicle door assembly which has a simple structure and can prevent the vehicle door and the door frame from freezing and being unable to open.

[0022] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows: a vehicle door assembly comprises the door frame structure as described above.

[0023] The beneficial effect of the above technical solution is that it has a simple structure and the door frame and the foot pedal can be heated by the heating strip, thereby preventing water from accumulating at the lower end of the door assembly and freezing of the door and the door frame due to severe cold.

[0024] A fourth object of the utility model is to provide a passenger rail vehicle with a simple structure and capable of preventing the vehicle door and the door frame from freezing and being unable to open.

[0025] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a passenger rail vehicle comprises the door assembly as described above.

[0026] The beneficial effects of the above technical solution are: its structure is simple, and it can avoid the situation where the car door is frozen and cannot be opened in extremely cold areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the assembly of the heating strip described in Example 1 of the utility model;

[0028] Figure 2 This is a schematic diagram of the heating strip in the disassembled state in Example 1 of the utility model;

[0029] Figure 3 This is a cross-sectional view of the case where the shell cover and the base shell are not fully assembled in place in Example 1 of the present utility model;

[0030] Figure 4 This is a cross-sectional view of the shell cover and the base shell in Embodiment 1 of the present utility model when they are assembled in place;

[0031] Figure 5 This is a schematic diagram of the end cover in Embodiment 1 of the present utility model being provided with one end of a plug-in slot;

[0032] Figure 6 It is a schematic diagram of the structure in the corresponding inflection of the base shell described in Example 1 of the utility model;

[0033] Figure 7 for Figure 6 A partial view of one end;

[0034] Figure 8 This is a simplified structural diagram of the door frame structure described in Example 2 of the present utility model;

[0035] Fig. 9 This is a schematic diagram of the change in door frame temperature with temperature difference when comparing Example 5 and Example 6 of the utility model.

[0036] In the figure: 1 heating strip; 11 shell; 111 base shell; 1111 first wire accommodating groove; 1112 rivet groove; 1113 first accommodating groove; 1114 second wire accommodating groove; 1115 second accommodating groove; 1116 third wire accommodating groove; 1117 first connecting hole; 112 shell cover; 1121 rivet tooth; 1122 second connecting hole; 113 end cover; 1131 plug-in groove; 1132 wire outlet hole; 1133 wire sleeve; 114 connecting hole; 12 heating wire; 13 temperature sensor; 131 lead wire; 14 ground wire; 141 metal block; 2 foot pedal; 21 through hole; 3 door frame body; 31 threaded blind hole; 4 bolt connection. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0038] Example 1

[0039] like Figure 1As shown, this embodiment provides a heating strip, including a shell 11 and a heating wire 12, the shell 11 is a straight strip and its cross section is "L"-shaped, the heating wire 12 is embedded in the shell 11, so that the entire heating strip is in the shape of an angle steel, and the heating wire is wrapped by the shell, so that its structural strength is high, preferably, the heating wire 12 is coiled in the shell 11, and its two ends are led out of the shell 11 through one end of the shell 11, so that the heat distribution of the entire heating strip is uniform during heating, and the heating effect is good.

[0040] The heating wire in this embodiment can be a carbon fiber heating wire (which has high electrothermal conversion efficiency and fast heating rate).

[0041] like Figure 2 As shown, the shell 11 in the above technical solution includes a base shell 111 and a shell cover 112, the base shell 111 and the shell cover 112 are both straight strips and their cross-sections are both "L"-shaped, the inner walls on both sides of the base shell 111 in the inflection are recessed with first wire accommodating grooves 1111 distributed in a serpentine shape, and both ends of the first wire accommodating groove 1111 are connected with one end of the base shell 111, the heating wire 12 is accommodated in the first wire accommodating groove 1111, the shell cover 112 is placed in the inflection of the base shell 111, and the directions of the inflections of the two are consistent, the two sides outside the inflection of the shell cover 112 are attached to and connected to the two sides inside the inflection of the shell 11, so that the entire body is spliced ​​by the base shell and the shell cover, and it is convenient to disassemble and maintain.

[0042] Preferably, the base shell 111 and the shell cover 112 can both be made of aluminum alloy or stainless steel, and the side outside the bend of the shell cover and the side inside the bend of the base shell are attached to each other and are in the shape of an angle steel as a whole; of course, the base shell and the shell cover are preferably made of aluminum alloy, and the surface of the base shell needs to be anodized.

[0043] like Figure 3 and Figure 4 As shown, in the above technical solution, both sides inside the inflection of the base shell 111 are recessed with rivet grooves 1112, and both sides outside the inflection of the shell cover 112 are convexly provided with rivet teeth 1121 that cooperate with the rivet grooves 1112. The two sides inside the inflection of the base shell 111 and the two sides outside the inflection of the shell cover 112 fit each other, and the rivet teeth 1121 are inserted into the rivet grooves 1112 on the corresponding sides to be riveted to each other, so that the base shell and the shell cover are plugged into each other through the rivet grooves and the rivet teeth for detachable connection, which makes it more convenient to disassemble and assemble the two.

[0044] In this embodiment, the wall thickness of the base shell can be thicker than that of the shell cover, so the rivet groove can be set on the base shell, and the rivet grooves on both sides of the base shell can be set at the edges on both sides of the base shell inflection, and the rivet teeth have a certain elasticity (the rivet teeth on the shell cover will produce a certain deformation when squeezed into the corresponding rivet grooves, and the rivet teeth will return to their original shape after being squeezed into the rivet grooves, and the base shell and the shell cover are riveted). In this embodiment, the rivet teeth and rivet grooves are both straight strips, and extend to the two ends close to the shell cover and the base shell respectively.

[0045] like Figure 1 , Figure 2 and Figure 5 As shown, the shell 11 in the above technical solution also includes an end cover 113, and the end cover 113 is "L"-shaped. An "L"-shaped plug-in groove 1131 is recessed at one end of the end cover 113, and a wire outlet hole 1132 that is mutually interlinked with the plug-in groove 1131 is provided at the other end of the end cover 113. The end of the heating wire 12 passing through the base shell 111 and the shell cover 112 is plugged into the plug-in groove 1131, and the two ends of the heating wire 12 pass through the wire outlet hole 1132 to the outside of the end cover 113, so that the end cover blocks the end of the base shell and the shell cover for the heating wire to pass through, which makes it aesthetically pleasing.

[0046] In this embodiment, the end cover is preferably made of rubber material, and one end of the end cover 113 corresponding to the wire outlet hole 1132 can protrude to form a wire sleeve 1133, and the wire outlet hole 1132 can be in the shape of a waist round hole.

[0047] like Figure 2-Figure 4 , Figure 6 and Figure 7 As shown, the above technical solution also includes a temperature sensor 13. A first receiving groove 1113 and a second wire receiving groove 1114 are also provided on any side of the inflection of the base shell 111. One end of the second wire receiving groove 1114 is connected with the first receiving groove 1113, and the other end of the second wire receiving groove 1114 passes through an end of the base shell 111 close to the end cover 113. The temperature sensor 13 is embedded in the first receiving groove 1113, and the lead 131 of the temperature sensor 13 is led out of the shell 11 through the second wire receiving groove 1114 and the wire outlet hole 1132. By embedding the temperature sensor in the shell, the real-time temperature of the heating strip can be conveniently known to control the heating power of the heating wire. The temperature sensor can be a waterproof product on the market.

[0048] like Figure 2-Figure 4 , Figure 6 and Figure 7As shown, the above technical solution also includes a grounding wire 14, one end of which is connected to a metal block 141. A second accommodating groove 1115 and a third wire accommodating groove 1116 are also provided on any side of the inflection of the base shell 111. One end of the third wire accommodating groove 1116 is connected to the second accommodating groove 1115, and the other end of the third wire accommodating groove 1116 passes through an end of the base shell 111 close to the end cover 113. The metal block is embedded in the second accommodating groove 1115, and the grounding wire 14 is located in the third wire accommodating groove 1116. The other end of the grounding wire 14 passes through the outlet hole 1132 to the outside of the shell 11. By arranging the metal block on the grounding wire, the grounding wire is more securely connected to the shell. In this embodiment, the metal block can be an aluminum block or an aluminum alloy block, etc., and its shape and size match the second accommodating groove, so that the grounding wire is riveted to the base shell through the metal block and is not easy to loosen.

[0049] Preferably, in this embodiment, after the heating wire is placed in the first wire accommodating groove, a filling layer can be filled into the first wire accommodating groove for sealing to prevent the heating wire from swinging in the first wire accommodating groove, thereby avoiding friction between the heating wire and the shell (the filling layer can be a resin material).

[0050] In this embodiment, the grounding wire and the temperature sensor are both arranged in the shell at one end close to the end cover, and the first wire accommodating groove needs to avoid the first accommodating groove 1113, the second wire accommodating groove 1114, the second accommodating groove 1115 and the third wire accommodating groove 1116 at the corresponding position.

[0051] Example 2

[0052] like Figure 8 As shown, this embodiment provides a door frame structure, including a foot pedal 2, a door frame body 3 and a heating strip 1 as described in Example 1, wherein the foot pedal 2 is connected to the lower end of the door frame body 3 by a plurality of bolt fasteners spaced along its length direction, and the heating strip 1 is clamped at the connection between the foot pedal 2 and the door frame body 3, so that the heating strip can heat the joint between the door frame body and the foot pedal, and the heating strip is easy to install and has high structural strength.

[0053] In this embodiment, the heating strip is corner-wrapped at the edge corresponding to the lower end of the door frame body, and one side of the heating strip is sandwiched between the foot pedal and the door frame body.

[0054] In the above technical solution, one side of the heating strip 1 is provided with a plurality of penetrating connection holes 114 at intervals along its length direction, and the plurality of connection holes 114 correspond one to one with the plurality of bolt connectors 4. The bolt connectors 4 pass through the corresponding connection holes 114 and connect the foot pedal 2 with the door frame body 3, thereby making the installation of the heating strip between the door frame body and the foot pedal more convenient.

[0055] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, in this embodiment, a plurality of first connection holes 1117 are arranged at intervals along the length direction of the base shell corresponding to the side where the connection hole 114 is arranged, and a plurality of second connection holes 1122 are arranged at intervals along the length direction of the shell cover corresponding to the side where the connection hole 114 is arranged, and the plurality of first connection holes and the plurality of second connection holes correspond to each other and are aligned with each other to form one connection hole, and the winding track of the first wire-accommodating groove on the base shell needs to avoid the first connection hole [the first wire-accommodating groove is normally distributed in a serpentine shape (such as an S-shaped distribution) on the side of the base shell where the first connection hole is not arranged, and can be arranged in a multi-segment serpentine winding area (can also be arranged in an S-shaped distribution) on the side of the base shell where the first connection hole is arranged, and there is a first connection hole between two adjacent sub-segment serpentine winding areas, see Figure 6 shown)].

[0056] See Figure 8 As shown, the bolting member described in this embodiment can be a bolt, and the upper end of the lower part of the door frame body described in this embodiment is recessed downwardly with a plurality of threaded blind holes 31, and the foot pedal is recessed with a plurality of through holes 21 along its length direction, and the plurality of through holes, the plurality of connecting holes and the plurality of threaded blind holes correspond to each other one by one and are aligned with each other (after alignment, a bolting member is inserted, and the threaded end of the bolting member is threadedly connected to the threaded blind hole), and the through hole can be a countersunk hole (whose upper end is thick and the lower end is thin), and it is better to use a hexagon socket bolt as the bolting member, and at this time the head of the bolting member can be accommodated in the countersunk hole.

[0057] The door frame structure provided in this embodiment does not require cutting or modification of the structure of the existing door frame body. The component can be installed by utilizing the structural gap between the existing door frame body and the foot pedal, thereby saving costs to the maximum extent and minimizing structural damage to the original door frame body.

[0058] Example 3

[0059] The present embodiment provides a vehicle door assembly, including a door frame structure as described in Embodiment 2, which has a simple structure and can heat the door frame and the foot pedal by a heating strip, thereby preventing water from accumulating at the lower end of the vehicle door assembly and freezing due to severe cold, causing the vehicle door and the door frame to freeze.

[0060] The vehicle door assembly described in this embodiment may be a sliding plug door.

[0061] Example 4

[0062] This embodiment provides a passenger rail vehicle, including the door assembly as described in Example 3, which has a simple structure and can prevent the door from freezing and being unable to open in extremely cold regions.

[0063] The passenger rail vehicle described in this embodiment can be a light rail vehicle, a tram, or a passenger train (conventional rail or high-speed rail).

[0064] Example 5

[0065] As in Example 1, the filling layer in this embodiment adopts a high-temperature resistant and waterproof epoxy resin material. When filling the first wire trough with the filling layer, the base shell is first placed in a constant temperature and humidity laboratory, and the epoxy resin is slowly injected into the first wire trough. After filling, it is naturally cured in a constant temperature and humidity environment indoors, and then the base shell, shell cover and end cover are assembled.

[0066] Example 6

[0067] The same as Example 5, but different in that the material of the filling layer in this embodiment is mica grouting glue (mica grouting glue has good thermal conductivity and can improve the heating rate of the heating device).

[0068] The heating strips corresponding to Example 5 and Example 6 were assembled into the door assembly respectively, and the heating performance of the two was compared. The comparison results are as follows: Fig. 9 (Schematic diagram of door frame temperature changing with temperature difference, with the units of horizontal and vertical axes both in °C) shows that when mica grouting glue is used for sealing, the temperature at the door frame changes with the temperature difference, and is generally higher than when epoxy resin is used for sealing. This means that heat can be better conducted from the heating strip to the door. However, from a material perspective, the lifespan and sealing performance of epoxy resin sealant are better than those of mica grouting sealing. Therefore, the corresponding sealing material can be used according to actual needs.

[0069] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A heating strip, characterized in that: The invention comprises a shell (11) and a heating wire (12); the shell (11) is in the shape of a straight bar and its cross section is in the shape of an "L"; the heating wire (12) is coiled inside the shell (11) and its two ends are led out of the shell (11) through one end of the shell (11).

2. The heating strip according to claim 1, characterized in that: The shell (11) comprises a base shell (111) and a shell cover (112); the base shell (111) and the shell cover (112) are both straight strip-shaped and their cross-sections are both "L"-shaped; first wire accommodating grooves (1111) distributed in a serpentine shape are recessed on the inner walls on both sides of the base shell (111) in the inflection, and both ends of the first wire accommodating groove (1111) are connected to one end of the base shell (111); the heating wire (12) is accommodated in the first wire accommodating groove (1111); the shell cover (112) is placed in the inflection of the base shell (111), and the inflection directions of the two are consistent; the two sides outside the inflection of the shell cover (112) are mutually attached to and connected with the two sides inside the inflection of the shell (11).

3. The heating strip according to claim 2, characterized in that: Both sides of the base shell (111) inside the inflection are concavely provided with rivet grooves (1112), and both sides of the shell cover (112) outside the inflection are convexly provided with rivet teeth (1121) that cooperate with the rivet grooves (1112). The two sides of the base shell (111) inside the inflection and the two sides of the shell cover (112) outside the inflection fit each other, and the rivet teeth (1121) are inserted into the rivet grooves (1112) on the corresponding sides to be riveted to each other.

4. The heating strip according to claim 2 or 3, characterized in that: The housing (11) further comprises an end cover (113), the end cover (113) being "L"-shaped, one end of the end cover (113) being recessed with an "L"-shaped plug-in slot (1131), the other end of the end cover (113) being provided with a wire outlet hole (1132) which is interpenetrating with the plug-in slot (1131), the base housing (111) and the housing cover (112) having one end through which the heating wire (12) passes is plugged into the plug-in slot (1131), and both ends of the heating wire (12) pass through the wire outlet hole (1132) to the outside of the end cover (113).

5. The heating strip according to claim 4, characterized in that: The invention also comprises a temperature sensor (13); a first accommodating groove (1113) and a second wire accommodating groove (1114) are provided on any one side of the inflection of the base shell (111); one end of the second wire accommodating groove (1114) is connected to the first accommodating groove (1113); the other end of the second wire accommodating groove (1114) passes through an end of the base shell (111) close to the end cover (113); the temperature sensor (13) is embedded in the first accommodating groove (1113); and a lead wire (131) of the temperature sensor (13) is led out to the outside of the shell (11) through the second wire accommodating groove (1114) and the wire outlet hole (1132).

6. The heating strip according to claim 4, characterized in that: The invention also comprises a grounding wire (14), one end of which is connected to a metal block (141); a second accommodating groove (1115) and a third wire accommodating groove (1116) are provided on any side of the inflection of the base shell (111); one end of the third wire accommodating groove (1116) is connected to the second accommodating groove (1115); the other end of the third wire accommodating groove (1116) passes through an end of the base shell (111) close to the end cover (113); the metal block is embedded in the second accommodating groove (1115); the grounding wire (14) is located in the third wire accommodating groove (1116); and the other end of the grounding wire (14) passes through the wire outlet hole (1132) to the outside of the shell (11).

7. A door frame structure, comprising a foot pedal (2) and a door frame body (3), wherein the foot pedal (2) is connected to the lower end of the door frame body (3) via a plurality of bolt connectors (4) spaced apart along the length direction thereof, characterized in that: It also comprises a heating strip (1) as claimed in any one of claims 1 to 6, one side of the heating strip (1) being clamped at the connection between the foot pedal (2) and the door frame body (3).

8. The door frame structure according to claim 7, characterized in that: One side of the heating strip (1) is provided with a plurality of through connection holes (114) spaced apart along its length direction, the plurality of connection holes (114) corresponding one to one with the plurality of bolt connectors (4), the bolt connectors (4) passing through the corresponding connection holes (114) and connecting the foot pedal (2) to the door frame body (3).

9. A vehicle door assembly, characterized in that: Comprising the door frame structure as claimed in claim 7 or 8.

10. A passenger rail vehicle, characterized in that: Comprising the vehicle door assembly as claimed in claim 9.

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